Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 42, Issue 18, Pages 7390-7397Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL064848
Keywords
earthquake detection; Mount St; Helens
Categories
Funding
- Directorate For Geosciences
- Division Of Earth Sciences [1520875] Funding Source: National Science Foundation
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In the summer of 2014 a dense array of 904 geophones was deployed at Mount St. Helens along the road and trail system within 15km distance of the summit crater. The array recorded continuous data for approximately 2weeks and presents an unprecedented seismic observation of an active volcano. A reverse-time imaging method is applied to short-term-average over long-term-average time series data to automatically detect and locate microseismicity. These efforts resulted in an order of magnitude increase in earthquake detections over the normal monitoring operations of the Pacific Northwest Seismic Network. Earthquake locations resolve a narrow, 1km wide, vertical lineament of seismicity which extends from the surface to 4km depth directly beneath the summit crater. This feature is interpreted as a fracture network that acts as a conduit connecting an underlying magma chamber to the surface.
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