Recent Status Report, Updates, and Information Releases

The January-February, 2010, earthquake swarm at Yellowstone National Park has diminished in terms of earthquake-occurrence rate and magnitudes. A few small events continue to be recorded each day at the University of Utah Seismograph Stations (UUSS), the YVO partner responsible for earthquake monitoring at Yellowstone National Park. Seismologists cannot state that the swarm has ceased, but the rate of earthquake occurrence in the Madison Plateau area is now at background levels for this area of Yellowstone. As such, UUSS and YVO will cease to issue daily updates unless conditions change.

As of February 8, 2010 14:00 MST, there have been 1799 events recorded by the automatic earthquake system of the University of Utah. Of those, 827 have been verified by seismic analysts and forwarded to the National Earthquake Information Center (NEIC) for incorporation in the permanent listing of earthquakes. Seismologists of the University of Utah will continue to analyze data from the past several weeks to finalize the earthquake information.

The largest events were a pair of earthquakes of magnitude 3.7 and 3.8 that occurred after 11 PM MST on January 20, 2010. Both events were felt throughout the park and in surrounding communities in Wyoming, Montana, and Idaho. Other smaller events were also reported as felt.

The earthquakes were on the Madison Plateau along the northwest side of the Yellowstone caldera, in an area where previous swarms had occurred over the past 30 years. Visual observation of landforms and geothermal features by Yellowstone National Park personnel did not show any changes that could be attributed to the earthquakes.

Yellowstone National Park is in a region of active seismicity associated with regional Basin and Range extension of the Western U.S., as well as youthful volcanism of the Yellowstone volcanic field. Pressurization due to crustal magma bodies of the Yellowstone hotspot and associated shallow geothermal reservoirs can also contribute to earthquakes. Scientists will continue to research the origin of these and other Yellowstone earthquakes.

Any new information will be posted to: http://volcanoes.usgs.gov/yvo/activity/index.php

A summary of the swarm and links to additional information can be found at: http://volcanoes.usgs.gov/yvo/publications/2010/10swarm.php

Seismic information on the earthquake can be viewed at the University of Utah Seismograph Stations: http://www.seis.utah.edu/

Seismograph recordings from stations of the Yellowstone seismograph network can be viewed online at: http://quake.utah.edu/helicorder/yell_webi.htm

An earthquake swarm continues on the northwest edge of Yellowstone Caldera. There is still no indication of premonitory volcanic or hydrothermal activity. As such, the Volcanic Alert Level remains at Normal (Aviation Color Code of Green).
A daily update about the swarm can be found at: http://volcanoes.usgs.gov/yvo/publications/2010/10swarm.php.

PRESS RELEASE FROM YVO PARTNER UNIVERSITY OF UTAH SEISMOGRAPH STATIONS

Press Release
University of Utah Seismograph Stations
Released: February 03, 2010 10AM MST

This release is a continuation of information updates building upon our five previous press releases on the ongoing earthquake swarm on the west side of Yellowstone National Park.

The University of Utah Seismograph Stations reports that a period of increased seismic activity occurred on February 2, 2010 beginning at ~3:30 PM MST. This period of increased activity lasted about 6 hours and included at least 2 events that were reported felt in Yellowstone National Park. The two largest earthquakes during this sequence were magnitude 3.1 and 2.8 that occurred at 7:31 PM and 7:44 PM respectively.

These earthquakes are part of an ongoing swarm in Yellowstone National Park that began January 17, 2010 (1:00 PM MST). The largest earthquake in the swarm as of 7 AM MST, February 03, 2010, has been a magnitude 3.8. There have been 1,719 located earthquakes in the swarm of magnitude 0.3 to 3.8. This includes 14 events of magnitude larger than 3, with 135 events of magnitude 2 to 3, and 1,570 events of magnitude less than 2. There have been multiple personal reports of ground shaking from observers inside the Park and in surrounding areas for some of the larger events (for felt reports, please visit http://earthquake.usgs.gov/eqcenter/dyfi/). Earthquake swarms are relatively common in Yellowstone.

Yellowstone Volcano Observatory scientists still consider that the swarm events are likely the result of slip on pre-existing faults and are not thought to be caused by underground movement of magma. Currently there is no indication of premonitory volcanic or hydrothermal activity, but ongoing observations and analyses will continue to evaluate these different sources.

Seismic information on the earthquake can be viewed at the University of Utah Seismograph Stations: http://www.seis.utah.edu/.

Seismograph recordings from stations of the Yellowstone seismograph network can be viewed online at: http://quake.utah.edu/helicorder/yell_webi.htm.

Anyone who has felt earthquakes in the swarm are encouraged to fill out a form on the USGS Community Felt reports web site: http://earthquake.usgs.gov/eqcenter/dyfi/.

This press release was prepared by the Yellowstone Volcano Observatory partners of the U.S. Geol. Survey, the University of Utah, and the National Park Service: http://volcanoes.usgs.gov/yvo/

The earthquake swarm on the northwest edge of Yellowstone Caldera continues. Since about 2200 UTC (1500 MST), the level of activity has increased, with 12 earthquakes >M1.5 recorded. Many more smaller events have been detected and will be quantified by analysts in the near future. The larger events continue to be felt in the Old Faithful area of Yellowstone National Park.

Over 1800 earthquakes have now been recorded since January 17, 2010, making this swarm longer (in time) and with more earthquakes than last year's swarm beneath Yellowstone Lake (December '08/January '09). The total seismic energy released is still somewhat less. The largest recorded swarm at Yellowstone remains the Fall 1985 swarm, located in a similar location in the NW corner of the Yellowstone Caldera.

At this time, YVO scientists and their collaborators have detected no anomalous ground deformation, strain, or increased thermal activity that could indicate precursory activity to phenomena such as steam explosions or volcanic eruptions. As such, the Volcanic Alert Level remains at Normal (Aviation Color Code of Green).

Yellowstone Volcano Observatory scientists consider that the swarm events are likely the result of slip on pre-existing faults and are not thought to be caused by underground movement of magma. Analysis of the swarm events is an ongoing process by all YVO scientists and University of Utah Seismograph Stations (UUSS) analysts will continue to review the earthquake data. An article on the current swarm is updated daily and can be found at: http://volcanoes.usgs.gov/yvo/publications/2010/10swarm.php

January 2010 Yellowstone Seismicity Summary

During the month of January 2010, Yellowstone National Park seismicity was dominated by a large swarm of earthquakes in the northwest side of the park that started January 17, 2010. These shocks were located about 10 miles to the southeast of West Yellowstone, MT and 10 miles to the northwest of Old Faithful, WY. As of Feb. 1, 2010, 1620 earthquakes have occurred in the swarm and were located by the University of Utah Seismograph Station (UUSS) automatic earthquake system. The swarm includes 12 events of M3+; 119 of M2.0-2.9; 992 of M1.0-1.9; and 497 of M0.0-0.9. The largest of these shocks was a magnitude 3.8 on January 21, 2010 at 11:16 PM MST. There have been multiple reports of persons experiencing ground shaking from observers inside the Park and in surrounding areas for the larger events.

Earthquake swarms are relatively common in Yellowstone but this is one of the largest in total number of earthquakes. Yellowstone Volcano Observatory scientists consider that the swarm events are likely the result of slip on pre-existing faults and are not thought to be caused by underground movement of magma. Currently there is no indication of premonitory volcanic or hydrothermal activity, but ongoing observations and analyses will continue to evaluate these different sources.

Analysis of the swarm events is an ongoing process and UUSS analysts will continue to review the earthquake data. For additional information please see http://volcanoes.usgs.gov/yvo/publications/2010/10swarm.php

Ground Deformation Summary: Continuous GPS data show that uplift of the Yellowstone Caldera has slowed significantly. Uplift rates for YVO GPS stations are less than 2.5 cm per year. The WLWY station, located in the northeastern part of the caldera, underwent a total of ~23 cm of uplift between mid-2004 and mid-2009. Its record can be found at:
http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots×eries=raw

The general uplift and subsidence of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the recent uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php

The earthquake swarm on the northwest edge of Yellowstone Caldera that began on January 17, 2010 continues. There is still no indication of premonitory volcanic or hydrothermal activity. For more information about the swarm, see http://volcano.wr.usgs.gov/yvo/publications/2010/10swarm.php.

PRESS RELEASE FROM YVO PARTNER UNIVERSITY OF UTAH SEISMOGRAPH STATIONS

Released: January 28, 2010 9:00AM MST

This release is a continuation of information updates building upon our four previous press releases on the ongoing earthquake swarm on the west side of Yellowstone National Park.

The University of Utah Seismograph Stations reports that a pair of earthquakes of magnitude 3.1 and 3.2 occurred in Yellowstone National Park. The magnitude 3.1 event occurred at 12:52 PM on January 27, 2010. The magnitude 3.2 occurred on the morning of January 28, 2010 at 1:46 AM. Both shocks were located around 9 miles to the southeast of West Yellowstone, MT and about 10 miles to the northwest of Old Faithful, WY. Both earthquakes were reported felt in Yellowstone National Park.

These earthquakes are part of an ongoing swarm in Yellowstone National Park that began January 17, 2010 (1:00 PM MST). The largest earthquake in the swarm as of 9 AM MST, January 28, 2010, has been a magnitude 3.8. There have been 1,497 located earthquakes in the swarm of magnitude 0.4 to 3.8 up to 9AM January 28, 2010. This includes 12 events of magnitude larger than 3, with 111 events of magnitude 2 to 3, and 1,374 events of magnitude less than 2. There have been multiple personal reports of ground shaking from observers inside the Park and in surrounding areas for some of the larger events (for felt reports, please visit http://earthquake.usgs.gov/eqcenter/dyfi/). Earthquake swarms are relatively common in Yellowstone.

Yellowstone Volcano Observatory scientists still consider that the swarm events are likely the result of slip on pre-existing faults and are not thought to be caused by underground movement of magma. Currently there is no indication of premonitory volcanic or hydrothermal activity, but ongoing observations and analyses will continue to evaluate these different sources.

Seismic information on the earthquake can be viewed at the University of Utah Seismograph Stations: http://www.seis.utah.edu/.

Seismograph recordings from stations of the Yellowstone seismograph network can be viewed online at: http://quake.utah.edu/helicorder/yell_webi.htm.

Anyone who has felt earthquakes in the swarm are encouraged to fill out a form on the USGS Community Felt reports web site: http://earthquake.usgs.gov/eqcenter/dyfi/.

This press release was prepared by the Yellowstone Volcano Observatory partners of the U.S. Geol. Survey, the University of Utah, and the National Park Service: http://volcanoes.usgs.gov/yvo/

The earthquake swarm on the northwest edge of Yellowstone Caldera that began on January 17, 2010 continues. There is still no indication of premonitory volcanic or hydrothermal activity.

PRESS RELEASE FROM YVO PARTNER UNIVERSITY OF UTAH SEISMOGRAPH STATIONS

Released: January 25, 2010 12PM MST

This release is a continuation of information updates building upon our three previous press releases on the ongoing earthquake swarm on the west side of Yellowstone National Park.

The University of Utah Seismograph Stations reports that a pair of earthquakes of magnitude 3.0 and 3.1 occurred in the evening of January 24, 2010 in Yellowstone National Park. The first event of magnitude 3.0 occurred at 11:09 PM and was followed by a magnitude 3.1 event at 11:21 PM. Both shocks were located around 9 miles to the southeast of West Yellowstone, MT and about 10 miles to the northwest of Old Faithful, WY. Typically, events of this magnitude are felt in and around the Park, but there were no reports of these particular events being felt.

These two earthquakes are part of an ongoing swarm in Yellowstone National Park that began January 17, 2010 (1:00 PM MST). The largest earthquake in the swarm as of 9 AM MST, January 25, 2010, has been a magnitude 3.8. There have been 1,271 located earthquakes in the swarm of magnitude 0.5 to 3.8. This includes 11 events of magnitude larger than 3, with 97 events of magnitude 2 to 3, and 1,163 events of magnitude less than 2. There have been multiple personal reports of ground shaking from observers inside the Park and in surrounding areas for some of the larger events (for felt reports, please visit http://earthquake.usgs.gov/eqcenter/dyfi/). Earthquake swarms are relatively common in Yellowstone.

The swarm events are likely the result of slip on pre-existing faults and are called tectonic earthquakes and are not thought to be caused by underground movement of magma. Currently there is no indication of premonitory volcanic or hydrothermal activity, but ongoing observations and analyses will continue to evaluate these different sources.

Seismic information on the earthquake can be viewed at the University of Utah Seismograph Stations: http://www.seis.utah.edu/.

Seismograph recordings from stations of the Yellowstone seismograph network can be viewed online at: http://quake.utah.edu/helicorder/yell_webi.htm.

Anyone who has felt earthquakes in the swarm are encouraged to fill out a form on the USGS Community Felt reports web site: http://earthquake.usgs.gov/eqcenter/dyfi/.

This press release was prepared by the Yellowstone Volcano Observatory partners of the U.S. Geol. Survey, the University of Utah, and the National Park Service: http://volcanoes.usgs.gov/yvo/

The earthquake swarm on the northwest edge of Yellowstone Caldera that began on January 17, 2010 continues.

PRESS RELEASE FROM YVO PARTNER UNIVERSITY OF UTAH SEISMOGRAPH STATIONS

Released: January 21, 2010 2:00PM MST

This release is a continuation of information updates building upon our two previous press releases on the ongoing earthquake swarm on the west side of Yellowstone National Park. The University of Utah Seismograph Stations reports that a pair of earthquakes of magnitude 3.7 and 3.8 occurred in the evening of January 20, 2010 in Yellowstone National Park.

The first event of magnitude 3.7 occurred at 11:01 PM and was shortly followed by a magnitude 3.8 event at 11:16 PM. Both shocks were located around 9 miles to the southeast of West Yellowstone, MT and about 10 miles to the northwest of Old Faithful, WY. Both events were felt throughout the park and in surrounding communities in Wyoming, Montana, and Idaho.

These two earthquakes are part of an ongoing swarm in Yellowstone National Park that began January 17, 2010 (1:00 PM MST). The largest earthquake in the swarm as of 12 PM, January 21, 2010, was a magnitude 3.8. There have been 901 located earthquakes in the swarm of magnitude 0.5 to 3.8. This includes 8 events of magnitude larger than 3, with 68 events of magnitude 2 to 3, and 825 events of magnitude less than 2. There have been multiple personal reports of ground shaking from observations inside the Park and in surrounding areas for some of the larger events (for felt reports, please visit http://earthquake.usgs.gov/eqcenter/dyfi/). Earthquake swarms are relatively common in Yellowstone.

The swarm earthquakes are likely the result of slip on pre-existing faults rather than underground movement of magma. Currently there is no indication of premonitory volcanic or hydrothermal activity, but ongoing observations and analyses will continue to evaluate these different sources.

Seismic information on the earthquake can be viewed at the University of Utah Seismograph Stations: http://www.seis.utah.edu/.

Seismograph recordings from stations of the Yellowstone seismograph network can be viewed online at: http://quake.utah.edu/helicorder/yell_webi.htm.

Anyone who has felt earthquakes in the swarm are encouraged to fill out a form on the USGS Community Felt reports web site: http://earthquake.usgs.gov/eqcenter/dyfi/.

This press release was prepared by the Yellowstone Volcano Observatory partners of the U.S. Geological Survey, the University of Utah, and the National Park Service: http://volcanoes.usgs.gov/yvo/

Earthquake swarm on the northwest edge of Yellowstone Caldera continues.

PRESS RELEASE FROM YVO PARTNER UNIVERSITY OF UTAH SEISMOGRAPH STATIONS

Released: January 19, 2010 03:00 PM MST

The University of Utah Seismograph Stations reports an update of information on an ongoing earthquake swarm in Yellowstone National Park that began January 17, 2010 (1:00 PM MST). The swarm is located about 10 miles northwest of Old Faithful, WY and 9 miles southeast of West Yellowstone, MT. The largest earthquake in the swarm as of 3 PM, January 19, 2010, was a magnitude 3.7 event that occurred at 2:31 PM, MST, January 19, 2010. and there have been 469 located earthquakes in the swarm of magnitudes 0.5 to 3.7. This includes 5 events of magnitude larger than 3, with 34 events of magnitude 2 to 3, and 430 events of magnitude less than 2. There have been multiple personal reports of ground shaking from observations inside Yellowstone National Park and in neighboring communities in Montana and Idaho for some of the larger events. Earthquake swarms of this nature are relatively common in Yellowstone National Park.

At this time the Yellowstone Volcano Observatory does not consider the swarm to be unusual and the earthquakes are likely related to tectonic fault sources. Also there is no indication of premonitory volcanic or hydrothermal activity, but ongoing analyses will evaluate these different sources.

Information on the earthquake can be viewed at the University of Utah Seismograph Stations: http://www.seis.utah.edu/.

Seismograph recordings from stations of the Yellowstone seismograph station can be viewed online at: http://quake.utah.edu/helicorder/yell_webi.htm.

Anyone who has felt earthquakes in the swarm are encouraged to fill out a form on the USGS Community Felt reports web site: http://earthquake.usgs.gov/eqcenter/dyfi/.
This press release was prepared by the Yellowstone Volcano Observatory partners of the U.S. Geol. Survey, the University of Utah, and the National Park Service: http://volcanoes.usgs.gov/yvo/

December 2009 Yellowstone Seismicity Summary

During the month of December 2009, 70 earthquakes were located in the Yellowstone National Park region. The largest event was a magnitude 2.2 on December 18 at 1:38 PM MST, located about 8 miles north northeast of West Yellowstone, MT. No earthquake swarms were recorded in December.

Earthquake activity in the Yellowstone region is at relatively normal background levels.

Ground Deformation Summary: Continuous GPS data show that uplift of the Yellowstone Caldera has slowed significantly and may have stopped. The WLWY station, located in the northeastern part of the caldera, underwent a total of ~23 cm of uplift between mid-2004 and mid-2009. Its record can be found at:
http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots×eries=raw

The general uplift and subsidence of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the recent uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php

December 2009 Yellowstone Seismicity Summary

During the month of December 2009, 70 earthquakes were located in the Yellowstone National Park region. The largest event was a magnitude 2.2 on December 18 at 1:38 PM MST, located about 8 miles north northeast of West Yellowstone, MT. No earthquake swarms were recorded in December.

Earthquake activity in the Yellowstone region is at relatively normal background levels.

Ground Deformation Summary: Continuous GPS data show that uplift of the Yellowstone Caldera has slowed significantly and may have stopped. The WLWY station, located in the northeastern part of the caldera, underwent a total of ~23 cm of uplift between mid-2004 and mid-2009. Its record can be found at:
http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots×eries=raw

The general uplift and subsidence of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the recent uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php

November 2009 Yellowstone Seismicity Summary

During the month of November 2009, 69 earthquakes were located in the Yellowstone National Park region. The largest event was a magnitude 3.1 on November 9 at 10:49 AM MST, located about 12 miles northeast of Lake Jct, Yellowstone NP. No earthquake swarms were recorded in November.

Earthquake activity in the Yellowstone region is at relatively normal background levels.

Ground Deformation Summary: Continuous GPS data show that uplift of the Yellowstone Caldera has slowed significantly and may have stopped. The WLWY station, located in the northeastern part of the caldera, underwent a total of ~23 cm of uplift between mid-2004 and mid-2009. Its record can be found at:
http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots×eries=raw

The general uplift and subsidence of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the recent uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php

October 2009 Yellowstone Seismicity Summary

During the month of October 2009, 218 earthquakes were located in the Yellowstone National Park region. The largest event was a magnitude 2.5 on October 15 at 3:39 PM MDT, located about 7 miles south southeast of West Thumb, Yellowstone NP. This event was the largest event in a swarm of 138 earthquakes that occurred October 12-23, with magnitudes ranging from -0.2 to 2.5.

Earthquake activity in the Yellowstone region is at relatively normal background levels.

Ground Deformation Summary: Continuous GPS data show that uplift of the Yellowstone Caldera has stopped for now. The WLWY station, located in the northeastern part of the caldera, underwent a total of ~23 cm of uplift between mid-2004 and mid-2009. Its record can be found at:
http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots×eries=raw

The general uplift and subsidence of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the recent uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php

September 2009 Yellowstone Seismicity Summary

During the month of September 2009, 177 earthquakes were located in the Yellowstone region. The largest event was a magnitude 2.3 on September 20 at 6:42 PM MDT, located about 4 miles northwest of Canyon Junction, WY. Two swarms were recorded in at September. The first swarm of 39 earthquakes occurred September 12-17. It was located about 6 miles north northwest of West Yellowstone, MT, with magnitudes ranging from -0.9 to 1.6. The second swarm of 66 earthquakes occurred September 13-18. It was located further south, about 7 miles south southwest of West Thumb, YNP, with magnitudes ranging from -0.5 to 1.8.

Earthquake activity in the Yellowstone region is at relatively normal background levels.

Ground Deformation Summary: Through September 2009, continuous GPS data show that uplift of the Yellowstone Caldera has slowed and may have stopped. The WLWY station, located in the northeastern part of the caldera, has undergone a total of ~23 cm of uplift since mid-2004. Its record can be found at:
http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots×eries=raw

The general uplift and subsidence of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the recent uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php

YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE
Tuesday, September 1, 2009 10:41 MDT (Tuesday, September 1, 2009 16:41 UTC)

YELLOWSTONE VOLCANO (CAVW#1205-01-)
44.43°N 110.67°W, Summit Elevation 9203 ft (2805 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN

August 2009 Yellowstone Seismicity Summary

During the month of August 2009, 86 earthquakes were located in the Yellowstone region. The largest event was a magnitude 2.1 on August 14 at 8:37 AM MDT, located about 10 miles north northwest of Madison Junction, WY. A small swarm of 29 earthquakes occurred August 8-12. The swarm was located about 5 miles northwest of West Yellowstone, MT with magnitudes ranging from 2.0 to -0.6.

Earthquake activity in the Yellowstone region is at relatively normal background levels.

Ground Deformation Summary: Through August 2009, continuous GPS data show that uplift of the Yellowstone Caldera has slowed and may have stopped. The WLWY station, located in the northeastern part of the caldera, has undergone a total of ~23 cm of uplift since mid-2004. Its record can be found at:
http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots&timeseries=raw

The general uplift and subsidence of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the recent uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php

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The Yellowstone Volcano Observatory (YVO) is a partnership of the U.S. Geological Survey (USGS), Yellowstone National Park, and University of Utah to strengthen the long-term monitoring of volcanic and earthquake unrest in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.

YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE
Monday, August 3, 2009 15:54 MDT (Monday, August 3, 2009 21:54 UTC)

YELLOWSTONE VOLCANO (CAVW#1205-01-)
44.43°N 110.67°W, Summit Elevation 9203 ft (2805 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN

July 2009 Yellowstone Seismicity Summary

During the month of July 2009, 98 earthquakes were located in the Yellowstone region. The largest event was a magnitude 2.7 on July 8 at 9:08 AM MDT, located about 5 miles south southeast of Fishing Bridge, WY. The swarm that began on June 30th continued through July 3. This small swarm was located about 15 miles east northeast of West Yellowstone, MT and totaled 37 earthquakes with magnitudes ranging from 3.3 to -0.2.

Earthquake activity in the Yellowstone region is at relatively normal background levels.

Ground Deformation Summary: Through July 2009, continuous GPS data show that uplift of the Yellowstone Caldera has slowed but may be continuing. The WLWY station, located in the northeastern part of the caldera, has undergone a total of ~23 cm of uplift since mid-2004. Its record can be found at:
http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots&timeseries=raw

The currently observed reduction in uplift rate may be related to seasonal changes related to snowmelt and groundwater recharge. In several of the past 5 years, such changes have caused decreased uplift or slight subsidence, but were followed later in the year by continued uplift. The general uplift of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the current uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php

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The Yellowstone Volcano Observatory (YVO) is a partnership of the U.S. Geological Survey (USGS), Yellowstone National Park, and University of Utah to strengthen the long-term monitoring of volcanic and earthquake unrest in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.

YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE
Wednesday, July 1, 2009 12:09 MDT (Wednesday, July 1, 2009 18:09 UTC)

YELLOWSTONE VOLCANO (CAVW#1205-01-)
44.43°N 110.67°W, Summit Elevation 9203 ft (2805 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN

June 2009 Yellowstone Seismicity Summary

During the month of June 2009, 77 earthquakes were located in the Yellowstone region. The largest event was a magnitude 3.3 on June 30 at 9:52 AM MDT, located about 15 miles east northeast of West Yellowstone, MT. This event was part of an ongoing small earthquake swarm that includes 25 events on June 30, beginning with the M3.3 The magnitudes during the swarm ranged from 3.0 to -0.2.

Earthquake activity in the Yellowstone region is at relatively normal background levels.

Ground Deformation Summary: Through June 2009, continuous GPS data show that uplift of the Yellowstone Caldera has slowed but may be continuing. The WLWY station, located in the northeastern part of the caldera, has undergone a total of ~23 cm of uplift since mid-2004. Its record can be found at:
http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots&timeseries=raw

The currently observed reduction in uplift rate may be related to seasonal changes related to snowmelt and groundwater recharge. In several of the past 5 years, such changes have caused decreased uplift or slight subsidence, but were followed later in the year by continued uplift. The general uplift of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the current uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php




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The Yellowstone Volcano Observatory (YVO) is a partnership of the U.S. Geological Survey (USGS), Yellowstone National Park, and University of Utah to strengthen the long-term monitoring of volcanic and earthquake unrest in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.

YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE
Monday, June 1, 2009 14:19 MDT (Monday, June 1, 2009 20:19 UTC)

YELLOWSTONE VOLCANO (CAVW#1205-01-)
44.43°N 110.67°W, Summit Elevation 9203 ft (2805 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN

May 2009 Yellowstone Seismicity Summary

During the month of May 2009, 133 earthquakes were located in the Yellowstone region. The largest event was a magnitude 3.0 on May 25 at 4:41 AM MDT, located about 5 miles southeast of Madison Junction, YNP. This event was part of a small earthquake swarm that, included 68 events on May 25 begining about 3 AM and stopping before 2PM local time. The magnitudes during the swarm ranged from 3.0 to 0.2.

Earthquake activity in the Yellowstone region is at relatively normal background levels.

Ground Deformation Summary: Through May 2009, continuous GPS data show that uplift of the Yellowstone Caldera has slowed but may be continuing. The WLWY station, located in the northeastern part of the caldera, has undergone a total of ~23 cm of uplift since mid-2004. Its record can be found at:
http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots&timeseries=raw

The currently observed reduction in uplift rate may be related to seasonal changes related to snowmelt and groundwater recharge. In several of the past 5 years, such changes have caused decreased uplift or slight subsidence, but were followed later in the year by continued uplift. The general uplift of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the current uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php




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The Yellowstone Volcano Observatory (YVO) is a partnership of the U.S. Geological Survey (USGS), Yellowstone National Park, and University of Utah to strengthen the long-term monitoring of volcanic and earthquake unrest in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.

YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE
Friday, May 1, 2009 11:17 MDT (Friday, May 1, 2009 17:17 UTC)

YELLOWSTONE VOLCANO (CAVW#1205-01-)
44.43°N 110.67°W, Summit Elevation 9203 ft (2805 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN

April 2009 Yellowstone Seismicity Summary

During the month of April 2009, 242 earthquakes were located in the Yellowstone region. The largest event was a magnitude 2.7 on April 28 at 7:14 PM MDT, located about 6 miles north northeast of Old Faithful, YNP. A second M 2.7 was part of a swarm detailed below. There were three earthquake swarms during the month of April. The first, located 4 miles northwest of West Yellowstone, included 62 events spanning April 13-18 with magnitudes ranging from 1.3 to -0.6. The second, located 7 miles northwest of West Yellowstone, included 111 events from April 17-24 with magnitudes 2.3 to -0.8. The third swarm, located 11 miles northeast of Old Faithful, included 19 events all occurring on April 29th with magnitudes ranging from 2.7 to 0.5.

Earthquake activity in the Yellowstone region is at relatively normal background levels.

An article on the recent earthquake swarm during December 2008 and January 2009 can be found at:
http://volcanoes.usgs.gov/yvo/publications/2009/09swarm.php
Scientists continue to look at data collected during the swarm and will publish their results over the coming months and years. However, if any findings have direct implications for public safety, they will be released to the public immediately.

Ground Deformation Summary: Through April 2009, continuous GPS data show that much of the Yellowstone caldera continued moving upward, though at a lower rate than the past several years. The WLWY station, located in the northeastern part of the caldera has undergone ~23 cm of uplift since mid-2004. The general uplift of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the current uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php




-----
The Yellowstone Volcano Observatory (YVO) is a partnership of the U.S. Geological Survey (USGS), Yellowstone National Park, and University of Utah to strengthen the long-term monitoring of volcanic and earthquake unrest in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.

YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE
Wednesday, April 1, 2009 12:04 MDT (Wednesday, April 1, 2009 18:04 UTC)

YELLOWSTONE VOLCANO (CAVW#1205-01-)
44.43°N 110.67°W, Summit Elevation 9203 ft (2805 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN

March 2009 Yellowstone Seismicity Summary

During the month of March 2009, 66 earthquakes were located in the Yellowstone region. The largest event was a magnitude 2.4 on March 3 at 2:37 AM MDT, located about 10 miles East of Canyon Junction, WY. There were no swarms during the month of March.

Earthquake activity in the Yellowstone region is at relatively normal background levels.

An article on the recent earthquake swarm during December 2008 and January 2009 can be found at:
http://volcanoes.usgs.gov/yvo/publications/2009/09swarm.php
Scientists continue to look at data collected during the swarm and will publish their results over the coming months and years. However, if any findings have direct implications for public safety, they will be released to the public immediately.

Ground Deformation Summary: Through March 2009, continuous GPS data show that much of the Yellowstone caldera continued moving upward, though at a lower rate than the past several years. The WLWY station, located in the northeastern part of the caldera has undergone ~23 cm of uplift over this time period. The general uplift of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the current uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php




-----
The Yellowstone Volcano Observatory (YVO) is a partnership of the U.S. Geological Survey (USGS), Yellowstone National Park, and University of Utah to strengthen the long-term monitoring of volcanic and earthquake unrest in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.

YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATE
Tuesday, March 3, 2009 17:33 MST (Wednesday, March 4, 2009 00:33 UTC)

YELLOWSTONE VOLCANO (CAVW#1205-01-)
44.43°N 110.67°W, Summit Elevation 9203 ft (2805 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN

February 2009 Yellowstone Seismicity Summary
During the month of February 2009, 51 earthquakes were located in the Yellowstone region. The largest event was a magnitude 2.1 on February 19 at 5:02 PM MST, located about 2 miles north of Fishing Bridge, YNP. There were no swarms during the month of February. Earthquake activity in the Yellowstone region is at relatively normal background levels.

An article on the recent earthquake swarm during December 2008 and January 2009 can be found at:
http://volcanoes.usgs.gov/yvo/publications/2009/09swarm.php
Scientists continue to look at data collected during the swarm and will publish their results over the coming months and years. However, if any findings have direct implications for public safety, they will be released to the public immediately.

Ground Deformation Summary: Through January 2009, continuous GPS data show that much of the Yellowstone caldera continued moving upward, though at a lower rate than the past several years. The WLWY station, located in the northeastern part of the caldera has undergone ~22 cm of uplift over this time period. The general uplift of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the current uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php




-----
The Yellowstone Volcano Observatory (YVO) is a partnership of the U.S. Geological Survey (USGS), Yellowstone National Park, and University of Utah to strengthen the long-term monitoring of volcanic and earthquake unrest in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.