| Title | Orthogonal fault rupture and rapid postseismic deformation following 2019 Ridgecrest, California, earthquake sequence revealed from geodetic observations |
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| Author | Feng, Q ;
Samsonov, S; Qiu, Q; Wang, Y; Zhang, P; Li, T; Zheng, W |
| Source | Geophysical Research Letters vol. 47, issue 5, e2019GL086888, 2020 p. 1-10, https://doi.org/10.1029/2019GL086888 |
| Image |  |
| Year | 2020 |
| Alt Series | Natural Resources Canada, Contribution Series 20210126 |
| Publisher | American Geophysical Union |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Area | California; United States of America |
| Lat/Long WENS | -120.0000 -115.5000 36.0000 34.5000 |
| Subjects | tectonics; Science and Technology; earthquakes; faults; aftershocks; North American Plate; Pacific Plate; San Andreas Fault; synthetic aperture radar surveys (SAR); Global positioning systems |
| Illustrations | location maps; seismic images; tables; distribution diagrams |
| Program | Canada Centre for Remote Sensing People Support and Leadership |
| Released | 2020 04 06 |
| Abstract | We studied the 2019 Mw6.4 and Mw7.1 Ridgecrest, California, earthquake sequence, using Sentinel?1 and ALOS?2 coseismic interferograms and subpixel offsets to retrieve the three?dimensional (3?D) surface
displacements. By inverting the 3?D displacements, optimal dip angles of the earthquake faults and the slip model were obtained. The interferometric synthetic aperture radar?based slip model supplemented with the analysis of GPS data shows that the
Mw6.4 event ruptured two orthogonal faults and its major geodetic moment was released by sinistral motion on a NE?SW trending fault that dips 78° NW. Right?lateral slip on NW?SE trending subvertical faults was responsible for the Mw7.1 earthquake.
Postseismic analysis with U.S. Geological Survey earthquake catalog and GPS time series at site P595 shows that the postseismic surface deformation following the Mw7.1 event has similar temporal patterns with the postseismic moment release, but
requires more energy. This implies that the early aftershocks were likely controlled by rapid afterslip following the mainshock. |
| Summary | (Plain Language Summary, not published)
We studied the 2019 Ridgecrest, California, earthquake sequence, using satellite radar data to retrieve the three-dimensional surface displacements. By
inverting the 3-D displacements, optimal dip angles of the earthquake faults and the slip model were obtained. Postseismic analysis revealed that the early aftershocks were likely controlled by rapid afterslip. |
| GEOSCAN ID | 328441 |
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