Recent Updates from the U.S. Geological Survey Volcano Hazards Program http://volcanoes.usgs.gov/ U.S. Geological Survey Volcano Hazards Program Sat, 25 May 2013 01:27:49 +0000 Elevated surface temperatures were observed in satellite images over the past week indicative of ongoing low-level activity. AVO has received no reports of ash emission or other indications of eruptive activity over the past 24 hours. Sudden explosions of blocks and ash are possible with little or no warning. Ash clouds, if produced, could exceed 20,000 feet above sea level. If a large ash-producing event occurs, nearby seismic, infrasound, or volcanic lightning networks should alert AVO staff quickly. However, for some events, a delay of several hours is possible. Cleveland Volcano does ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=8644http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=864452.8222 -169.945WATCHORANGE The eruption of Pavlof continues, but at a lower level of activity than earlier in the week. Early in the week, continuous seismic tremor, intense elevated surface temperatures, and ash, gas and steam emissions characterized activity. A continuous plume of steam, ash, and gas, occasionally reaching up to 22,000 ft. above sea level but mostly below 15,000 ft., was observed in satellite images, by pilots, and observers on the ground in Cold Bay and Sand Point. Trace amounts of ash fall occurred in the community of Sand Point on May 18 and Nelson Lagoon on May 19-21. A lava flow advanced down ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=8643http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=864355.4173 -161.8937WATCHORANGE Activity Summary: At the summit, tilt and the lava lake level were stable over the past 24 hours. At the middle east rift zone, there was no lava activity within Pu`u `O`o crater, but the Kahauale`a II lava flow remained active north of Pu`u `O`o. To the southeast, the Peace Day flow had active breakouts on the pali and coastal plain, but most of the flow stayed within its lava tube until reaching the ocean on both the east and west sides of the Hawai`i Volcanoes National Park boundary. Gas emissions from the volcano remained elevated. Recent Observations at Kilauea summit: ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=8642http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=864219.421 -155.287WATCHORANGE Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal levels of background seismicity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; and Mount Hood, Mount Jefferson, Three Sisters, Newberry Volcano, and Crater Lake in Oregon. Recent Observations: Seismicity and deformation in the Cascades generally remained at typical background levels this past week. The only notable events included a M2.5 quake just south of Mount St. Helens which was followed by a number of aftershocks over a several ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=8641http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=864145.61 -122.5NORMALGREEN A constant steam and gas plume from Pagan was visible in satellite images over the past week. This is typical of recent months of observation of Pagan. A pilot report from a commercial aircraft flying over Pagan on Tuesday reported a vigorous plume although no ash was identifiable in satellite images and there were no reports of eruptive activity by residents on the island. The gas/vapor plume may just have been more vigorous on this day. Because of this ongoing emission of volcanic gas from Pagan, it remains possible that residents of the CNMI may notice sulfurous odors under certain ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=8640http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=864018.13 145.8ADVISORYYELLOW Activity Summary: At the summit, tiltmeters recorded slowing DI inflation since yesterday morning. The lava lake level rose slightly, mimicking the tilt change. At the middle east rift zone, there was no lava activity within Pu`u `O`o crater, but the Kahauale`a II lava flow remained active north of Pu`u `O`o. To the southeast, the Peace Day flow had active breakouts on the pali and coastal plain, but most of the flow stayed within its lava tube until reaching the ocean on both the east and west sides of the Hawai`i Volcanoes National Park boundary. Gas emissions from the volcano ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=8639http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=863919.421 -155.287WATCHORANGE Elevated surface temperatures were observed by satellite over the past 24 hours indicative of ongoing low-level activity. AVO has received no reports of ash emission or other indications of eruptive activity over the past 24 hours. Sudden explosions of blocks and ash are possible with little or no warning. Ash clouds, if produced, could exceed 20,000 feet above sea level. If a large ash-producing event occurs, nearby seismic, infrasound, or volcanic lightning networks should alert AVO staff quickly. However, for some events, a delay of several hours is possible. Cleveland Volcano does not ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=8638http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=863852.8222 -169.945WATCHORANGE The eruption of Pavlof continues at low levels today. Small discrete events, likely indicative of small explosions continue to be detected on seismic and pressure sensor networks over the past 24 hours. Seismic tremor declined markedly on Tuesday morning and has not resumed. Cloudy conditions obscured satellite observations of the volcano over the past 24 hours but a pilot report and photos from yesterday afternoon showed a very weak steam and gas plume with little to no ash issuing from the vent. Elevated surface temperatures were observed in satellite images, even through cloud cover, ...http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=8637http://volcanoes.usgs.gov/activity/archive/current.php?noticeid=863755.4173 -161.8937WATCHORANGE