Kinematic Slip Model of the 2021 M 6.0 Antelope Valley, California, Earthquake
| Autor: | Fred F. Pollitz, Chuck W. Wicks, William C. Hammond |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | The Seismic Record, Vol 2, Iss 1, Pp 20-28 (2022) |
| Druh dokumentu: | article |
| ISSN: | 2694-4006 03202100 |
| DOI: | 10.1785/0320210043 |
| Popis: | We present a kinematic slip model of the 8 July 2021 Antelope Valley earthquake from a finite-source inversion based on regional seismic waveforms and static offsets from Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (InSAR). Seismic waveforms are employed at 6 s dominant period out to 100 km from the epicenter, and the combined GPS and InSAR datasets cover the near field and far field out to ∼100 km and constrain the overall rupture size. The aftershock pattern defines a nearly north-striking, 50° east-dipping fault plane. We find a unilateral rupture along this fault plane propagating southward and updip with predominantly normal slip up to ∼1.5 m. The estimated seismic moment of 8.47×10^17 N·m is equivalent to Mw 5.92. A finite-source inversion that retains seismic waveforms and GPS static offsets but omits InSAR range changes yields a seismic moment of 1.08×10^18 N·m (Mw 5.99). Despite vigorous aftershock activity between 10 km and Earth’s surface, coseismic slip is concentrated in the depth interval 7–10 km. |
| Databáze: | Directory of Open Access Journals |
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