Recent Updates from the U.S. Geological Survey Volcano Hazards Program http://volcanoes.usgs.gov/ U.S. Geological Survey Volcano Hazards Program Thu, 02 Jul 2009 23:45:34 +0000 Report prepared by the U.S. Geological Survey. No reports of eruptive activity at Anatahan were received the past week. Seismic levels have remained low over the past week. Nothing unusual was observed in satellite images throughout the week. http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=4461http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=446116.35 145.67NORMALGREEN No significant change has been observed at Redoubt over the last 24 hours. Seismicity at the volcano continues at slightly above background. Web camera views this morning are obscured by clouds. Data from yesterday's gas-measurement flight are still being processed, but preliminary results indicate that emissions of both SO2 and CO2 are down from the last measurement on June 11. Earlier this week, AVO lowered the Aviation Color Code to Yellow and the Alert Level to Advisory at Redoubt volcano based on a significant decrease in the rate of lava extrusion observed over the past several ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=4459http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=445960.4852 -152.7438ADVISORYYELLOW AVO received no reports of activity at Cleveland during the past 24 hours. Recent satellite views of the volcano have been obscured by clouds. http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=4460http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=446052.8222 -169.945ADVISORYYELLOW Activity Summary for past 24 hours: The summit vent remains choked with rubble from Tuesday's collapses. Sporadic gas jetting noises were heard coming from the vent late yesterday afternoon, and a few points of incandescence deep in the vent were seen by Webcam overnight. Lava from east rift zone vents continues to flow through tubes to the coast and is entering the ocean at two locations west of Kalapana. Active lava flows are present on the pali in, and adjacent to, the Royal Gardens subdivision. Sulfur dioxide emission rates from the Halema`uma`u and Pu`u `O`o vents remain ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=4458http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=445819.421 -155.287WATCHORANGE The real-time detection system located no earthquakes in the Long Valley caldera region since the last update at 9:21 AM (PDT) on July 1. http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=4457http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=445737.7 -118.87NORMALGREEN No significant change has been observed at Redoubt over the last 24 hours. Seismicity at the volcano continues at slightly above background. Mostly clear web camera views this morning show patchy snow on the new lava dome and a robust steam plume heading to the west. AVO is conducting two field missions today: fixed-wing gas measurements and helicopter-supported maintenance of monitoring equipment, thermal imaging of the dome, and other observations. Yesterday, AVO lowered the Aviation Color Code to Yellow and the Alert Level to Advisory at Redoubt volcano based on a significant ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=4455http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=445560.4852 -152.7438ADVISORYYELLOW AVO received no reports of activity at Cleveland during the past 24 hours. Recent satellite views of the volcano have been obscured by clouds. http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=4456http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=445652.8222 -169.945ADVISORYYELLOW 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 ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=4454http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=445444.43 -110.67NORMALGREEN Activity Summary for past 24 hours: A major collapse of the summit vent occurred early Tuesday afternoon, causing an instability that led to numerous collapse events over the ensuing three hours. These collapses were associated with brown plumes, shaking that was occasionally strong enough to be felt locally, and a sharp decrease in tremor at Kilauea's summit. Overnight, there was no glow from the summit or Pu`u `O`o eruptive vents. Lava from east rift zone vents continues to flow through tubes to the coast and is entering the ocean at two locations west of Kalapana. Active lava flows ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=4453http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=445319.421 -155.287WATCHORANGE The real-time detection system located two small earthquakes in the Long Valley caldera region since the last update at 9:29 AM (PDT) on June 30. Both had magnitudes less than M=1.0.http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=4452http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=445237.7 -118.87NORMALGREEN Extended Information Statement Summary The 2009 eruption of Redoubt volcano began March 15th, 2009 with a steam explosion. Between March 22nd and April 4th, Redoubt produced multiple significant explosions that sent ash and gas clouds to as high as 65,000 feet (19.8 km) above sea level. After April 4th, the eruption continued with extrusion of a lava dome within the summit crater, eventually producing a blocky lava flow that currently extends ~0.6 miles (1 km) down the north flank of the volcano. Redoubt entered its 14th week of eruptive activity the week of June 22nd. ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=4451http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=445160.4852 -152.7438ADVISORYYELLOW