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= Seismicity and infrasound associated with explosions at Mount St. Helens, 2004-2005 =
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Six explosions occurred during 2004-5 in association with renewed eruptive activity at Mount St. Helens, Washington. Of four explosions in October 2004, none had precursory seismicity and two had explosion-related seismic tremor that marked the end of the explosion. However, seismicity levels dropped following each of the October explosions, providing the primary instrumental means for explosion detection during the initial vent-clearing phase. In contrast, explosions on January 16 and March 8, 2005, produced noticeable seismicity in the form of explosion-related tremor, infrasonic signals, and, in the case of the March 8 explosion, an increase in event size ~2 hours before the explosion. In both 2005 cases seismic tremor appeared before any infrasonic signals and was best recorded on stations located within the crater. These explosions demonstrated that reliable explosion detection at volcanoes like Mount St. Helens requires seismic stations within 1-2 km of the vent and stations with multiple acoustic sensors.
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      "abstract": "Six explosions occurred during 2004-5 in association \nwith renewed eruptive activity at Mount St. Helens, Washington. Of four explosions in October 2004, none had precursory \nseismicity and two had explosion-related seismic tremor that \nmarked the end of the explosion. However, seismicity levels \ndropped following each of the October explosions, providing \nthe primary instrumental means for explosion detection during the initial vent-clearing phase. In contrast, explosions on \nJanuary 16 and March 8, 2005, produced noticeable seismicity in the form of explosion-related tremor, infrasonic signals, \nand, in the case of the March 8 explosion, an increase in event \nsize ~2 hours before the explosion. In both 2005 cases seismic \ntremor appeared before any infrasonic signals and was best \nrecorded on stations located within the crater. These explosions demonstrated that reliable explosion detection at volcanoes like Mount St. Helens requires seismic stations within \n1-2 km of the vent and stations with multiple acoustic sensors.",
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Latest revision as of 02:21, 15 August 2024

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