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Kinematic Slip Model of the 2021 M 6.0 Antelope Valley, California, Earthquake
- Source :
- The Seismic Record, Vol 2, Iss 1, Pp 20-28 (2022)
- Publication Year :
- 2022
- Publisher :
- Seismological Society of America, 2022.
-
Abstract
- 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.
Details
- Language :
- English
- ISSN :
- 26944006 and 03202100
- Volume :
- 2
- Issue :
- 1
- Database :
- Directory of Open Access Journals
- Journal :
- The Seismic Record
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.01501a7b9194c6ab686694893cf46d6
- Document Type :
- article
- Full Text :
- https://doi.org/10.1785/0320210043