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Multifault Models of the 2019 Ridgecrest Sequence Highlight Complementary Slip and Fault Junction Instability

Jia, Zhe and Wang, Xin and Zhan, Zhongwen (2020) Multifault Models of the 2019 Ridgecrest Sequence Highlight Complementary Slip and Fault Junction Instability. Geophysical Research Letters, 47 (17). Art. No. e2020GL089802. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20200911-133129793

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Abstract

The 2019 Ridgecrest M_w 6.4 and M_w 7.1 earthquakes ruptured a complex fault system, posing challenges in understanding their physical processes. Modeling of the ruptures relies on fault geometries at depth, which are usually assumed based on surface traces and aftershocks. Here we use seismic and geodetic data to jointly constrain the fault geometries and slip distributions. We first represent the first‐order rupture processes with a series of subevents, then conduct slip inversions with subevent‐guided fault geometries. We find that the foreshock sequentially ruptured the NW and SW striking faults starting from their junction. The mainshock initiated at a complex three‐fault junction along the extension of the foreshock NW rupture, with major slip first occurring bilaterally near the hypocenter and then minor unilateral slip later to the southeast end. The slip distributions of the foreshock and mainshock are complementary to each other on the overlapping fault section.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2020gl089802DOIArticle
ORCID:
AuthorORCID
Jia, Zhe0000-0003-0652-2646
Wang, Xin0000-0002-6180-0058
Zhan, Zhongwen0000-0002-5586-2607
Alternate Title:Multi‐fault models of the 2019 Ridgecrest sequence highlight complementary slip and fault junction instability
Additional Information:© 2020. American Geophysical Union. Issue Online: 02 September 2020. Version of Record online: 02 September 2020. Accepted manuscript online: 30 August 2020. Manuscript accepted: 21 August 2020. Manuscript revised: 20 August 2020. Manuscript received: 14 July 2020. We thank Zachary Ross for the aftershock catalog (https://scedc.caltech.edu/research-tools/QTM-ridgecrest.html), Eric Fielding, Benjamin Idini, Ollie Stephenson for processing InSAR interferograms, and Kejie Chen for processing the HRGPS time series. We thank Kejie Chen, Jean‐Philippe Avouac, Joann Stock and Jennifer Jackson for helpful discussions. We thank two anonymous reviewers for suggestions. This work is supported by USGS grant G19AP00030. Data Availability Statement. We thank SCEDC for access to the strong‐motion data (https://scedc.caltech.edu), IRIS for the teleseismic waveforms (http://ds.iris.edu/wilber3/find_event), and UNAVCO for the HRGPS observations (https://www.unavco.org/projects/other-projects/high-rate-gps/high-rate-gps.html). We thank the JPL ARIA team for distributing the InSAR data (https://aria-share.jpl.nasa.gov/20190704-0705-Searles_Valley_CA_EQs/SRL-Data_Mine/) (Fielding et al., 2020). We thank SCEC for the Community Velocity Models (https://www.scec.org/research/ucvm).
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
USGSG19AP00030
Issue or Number:17
Record Number:CaltechAUTHORS:20200911-133129793
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200911-133129793
Official Citation:Jia, Z., Wang, X., & Zhan, Z. (2020). Multifault models of the 2019 Ridgecrest sequence highlight complementary slip and fault junction instability. Geophysical Research Letters, 47, e2020GL089802. https://doi.org/10.1029/2020GL089802
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105328
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:15 Sep 2020 21:08
Last Modified:15 Sep 2020 21:08

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