Source characterizations of northern California earthquakes through moment rate function properties
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Taka'aki Taira
Berkeley Seismological Laboratory, UC Berkeley
- Date & Time
- Location
- Hybrid In Person and Online-only seminar via Microsoft Teams
- Host
- Theresa Sawi
- Summary
We compile moment rate functions (MRFs) of small to moderate earthquakes with magnitudes (M) between 3-6 for northern California through an empirical Green’s function approach with the aim to systematically evaluate radiate energy and also rupture complexities. In particular, our interest is to explore if the moment-scaled radiated energy depends on seismic moment, i.e., if our data set can be explained by whether self-similarity or non-self-similarity scaling. Our results from 235 earthquakes suggest a weak non-self-similarity behavior, which appears to be consistent with results from Kanamori and Rivera (2004, BSSA) that analyzed southern California earthquakes. We also performed a finite-fault modeling for subsets of earthquakes by inverting MRFs including the 2022 Mw5.1 Alum Rock earthquake. This earthquake exhibits a complex rupture process involving three subevents with a southeast directivity. The peak and median slips are found to be 42 cm and 14 cm respectively, which yields the peak and median stress drops of 28 MPa and 5 MPa.