Journal
GEOLOGY
Volume 46, Issue 11, Pages 943-946Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G45354.1
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Funding
- National Science Foundation [OCE-1434550]
- Los Alamos National Laboratory [LA-UR-18-20134]
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Data from an amphibious seismic network in Cascadia (northwest North America) provide unique near-source observations to assess the influence of subducting topography on seismicity. Using subspace detection, we detect and locate 222 events in two separate clusters, near a subducted seamount and a possibly accreted seamount. Seismicity in both clusters is largely shallower than the plate interface and exhibits occasional swarm-like behavior. This implies that the seamount is subducting aseismically via weak coupling with the overriding plate, while earthquakes in the upper plate arise from a high degree of fracturing due to seamount interaction, and the accreted seamount induced similar fracturing before off-scraping.
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