Recent Updates from the U.S. Geological Survey Volcano Hazards Program http://volcanoes.usgs.gov/ U.S. Geological Survey Volcano Hazards Program Sun, 22 Nov 2009 18:03:04 +0000 The real-time computer system located two small earthquakes in the vicinity of Long Valley caldera since the last update at 10:04 AM (PST) on November 21. A magnitude M=1.6 earthquake at 6:00 AM was located in the Sierra Nevada south of the caldera (14 miles WSW of Tom's Place), and M=0.8 earthquake at 9:40 AM was located beneath Mammoth Mountain, both on the 22nd. http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=5027http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=502737.7 -118.87NORMALGREEN Activity Summary for past 24 hours: At the summit, a circulating, bubbling, spattering, rising, and falling lava pond surface was visible in a hole in the vent cavity floor deep beneath Halema`uma`u Crater floor. Sulfur dioxide emission rates from the Halema`uma`u and east rift zone vents remain elevated. Lava flows are active on the coastal plain; lava flows through tubes to the coast and is likely entering the ocean at two locations west of Kalapana. Past 24 hours at Kilauea summit: At 9:21 am yesterday morning, a sliver of the Halema`uma`u vent rim (in the Halema`uma`u ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=5026http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=502619.421 -155.287WATCHORANGE Activity Summary for past 24 hours: A DI event is nearly complete. At the summit, a circulating, bubbling, and spattering lava pond surface was visible in a hole in the vent cavity floor deep beneath Halema`uma`u Crater floor; its level rose several meters covering the entire vent floor before dropping but remaining visible in the Overlook vent Webcam. Sulfur dioxide emission rates from the Halema`uma`u and east rift zone vents remain elevated. Lava flows are active on the coastal plain; lava flows through tubes to the coast and is entering the ocean at two locations west of Kalapana. ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=5025http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=502519.421 -155.287WATCHORANGE Activity Summary for past 24 hours: A DI event is nearly complete. At the summit, a circulating, bubbling, and spattering lava pond surface was visible in a hole in the vent cavity floor deep beneath Halema`uma`u Crater floor; its level rose several meters covering the entire floor before dropping but remaining visible in the Overlook vent Webcam. Sulfur dioxide emission rates from the Halema`uma`u and east rift zone vents remain elevated. Lava flows are active on the coastal plain; lava flows through tubes to the coast and is entering the ocean at two locations west of Kalapana. ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=5024http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=502419.421 -155.287WATCHORANGE The real-time computer system located just one small earthquake in the vicinity of Long Valley caldera since the last update at 9:26 AM (PST) on November 20. This was a magnitude M=1.6 earthquake at 3:51 PM on the 20th centered at the depth of 5 miles beneath the eastern outskirts of Mammoth Lakes (1/4 mile north of the corrals). http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=5023http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=502337.7 -118.87NORMALGREEN