Seismicity and infrasound associated with explosions at Mount St. Helens, 2004-2005: Chapter 6 in A volcano rekindled: the renewed eruption of Mount St. Helens, 2004-2006
Professional Paper
1750-6
This report is Chapter 6 in A volcano rekindled: the renewed eruption of Mount St. Helens, 2004-2006. For more information, see: Professional Paper 1750
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Abstract
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.
Suggested Citation
Moran, S.C., McChesney, P.J., and Lockhart, A., 2008, Seismicity and infrasound associated with explosions at Mount St. Helens, 2004-2005: U.S. Geological Survey Professional Paper 1750-6, 17 p., https://doi.org/10.3133/pp17506.
ISSN: 2330-7102 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Seismicity and infrasound associated with explosions at Mount St. Helens, 2004-2005 |
| Series title | Professional Paper |
| Series number | 1750-6 |
| DOI | 10.3133/pp17506 |
| Year Published | 2008 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Volcano Hazards Program |
| Description | 17 p. |
| Larger Work Type | Report |
| Larger Work Subtype | USGS Numbered Series |
| Larger Work Title | A volcano rekindled: the renewed eruption of Mount St. Helens, 2004-2006 (Professional Paper 1750) |
| First page | 111 |
| Last page | 127 |
| Country | United States |
| State | Washington |
| Other Geospatial | Mount St. Helens |