Towards Consistent Event Classification at Mount Baker Volcano, Washington, USA
Mount Baker has a very high volcanic threat potential, motivating continuous seismic monitoring since the 1970s by the Pacific Northwest Seismic Network (PNSN) in collaboration with the USGS Cascades Volcano Observatory. Mount Baker has produced few volcano-tectonic earthquakes during its instrumented history, but has produced a notable amount of deep, low-frequency seismic events (deep LFs). Deep LFs are attributed to trans-crustal fluid migration and may provide key insights on magmatic activity at Mount Baker. The glaciers cladding Mount Baker also produce low-frequency seismic events (shallow LFs). The similar characteristics of both LF source types, combined with sparse station coverage around Mount Baker, make consistent and accurate event detection, location, and classification difficult. Minor improvements to station coverage by the PNSN motivated new attention to characterizing LFs in this region in the past few years, providing an opportunity to reassess past event classifications with new insights. To do this, we cross-correlated 622 events within 30 km of Mount Baker cataloged between 2001 and 2024. Shallow LFs, tectonic earthquake clusters, and well-constrained deep LFs grouped at low correlation thresholds, even at modest station offsets. These groups contain a subset of likely misclassified events and provide a basis for matched filter processing that may improve event detection and classification consistency at Mount Baker. Weakly-constrained LFs predominantly correlated with the shallow LF group despite having depth estimates indicative of deep LFs, particularly in the past two years. This underscores the ongoing need for improved station coverage around Mount Baker to produce accurate event locations.
Session: Network Seismology: Recent Developments, Challenges and Lessons Learned - II
Type: Oral
Room: Holiday Ballroom 4-6+Corridor
Date: 4/15/2025
Presentation Time: 11:15 AM (local time)
Presenting Author: Nathan Stevens
Student Presenter: No
Invited Presentation:
Poster Number:
Additional Authors
Nathan Stevens Presenting Author Corresponding Author ntsteven@uw.edu University of Washington |
Suphakorn Poobua spoobu@uw.edu University of Washington |
J Renate Hartog jrhartog@uw.edu University of Washington |
Stephen Malone malone@uw.edu University of Washington |
Weston Thelen wthelen@usgs.gov U.S. Geological Survey |
Amy Wright akwright@uw.edu University of Washington |
Barrett Johnson bnjo@uw.edu University of Washington |
Colin O'Rourke corourke@usgs.gov U.S. Geological Survey |
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Towards Consistent Event Classification at Mount Baker Volcano, Washington, USA
Category
Network Seismology: Recent Developments, Challenges and Lessons Learned
Description