A Look Under the Hood: Characterizing the Spatiotemporal Evolution of Mount Hood Seismicity Through Data Mining and High Precision Relocation
Description:
The region right around Mount Hood volcano, located 80 km east from Portland, is the most seismically area in Oregon, producing ~3k earthquakes since 1979. Seismicity near and below volcanoes is typically generated by fluids or gas migration, magmatic recharge and intrusions, through changes in regional stress regimes, or a combination of each. Careful examination of high-precision earthquake catalogs can elucidate seismogenic structures and uncover spatial and temporal patterns and evolutions of those structures at various timescales. The goal of this study is to characterize the seismicity of Mount Hood, the variability in sequence/swarm duration and location, measure the orientations of the faulting structures at depth, and the effects of improving the station density through time. To accurately characterize the recorded seismicity at Mount Hood, we constructed a high-resolution earthquake catalog. This was done by mining all continuous seismic data for stations within 50 km of Mount Hood, hunting hidden earthquakes using waveform template matching. Our detection efforts yielded a catalog of 24k new earthquakes. Locations were performed using NonLinLoc SSST + Coherence and of the 27k earthquakes in the enhanced catalog, 7,667 earthquakes were located. Our preliminary results suggest a complex faulting network in space with earthquake clusters located at and just below the summit, and on the flanks to the west, southwest, and southeast. Additionally, our preliminary temporal analysis results show a range of durations for different clusters. Further analysis is needed to identify the sources of these short, intermediate and long duration seismicity patterns.
Session: Seismology's Role in Assessing Volcanic Hazard at Multiple Time Scales
Type: Oral
Date: 4/18/2023
Presentation Time: 10:00 AM (local time)
Presenting Author: Barrett N. Johnson
Student Presenter: Yes
Invited Presentation:
Authors
Barrett Johnson Presenting Author Corresponding Author bnjo@uw.edu University of Washington |
Renate Hartog jrhartog@uw.edu University of Washington |
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A Look Under the Hood: Characterizing the Spatiotemporal Evolution of Mount Hood Seismicity Through Data Mining and High Precision Relocation
Category
Seismology's Role in Assessing Volcanic Hazard at Multiple Time Scales