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Isotropic Source Components of Events in the 2019 Ridgecrest, California, Earthquake Sequence

Cheng, Yifang and Wang, Xin and Zhan, Zhongwen and Ben-Zion, Yehuda (2021) Isotropic Source Components of Events in the 2019 Ridgecrest, California, Earthquake Sequence. Geophysical Research Letters, 48 (18). Art. No. e2021GL094515. ISSN 0094-8276. doi:10.1029/2021GL094515.

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We investigate the non-double-couple components of 224 M ≥ 3.0 earthquakes in the 2019 M_w7.1 Ridgecrest sequence, which occurred on a complex fault system in the Eastern California Shear Zone. Full moment tensors are derived using waveform data from near-fault and regional stations with a generalized cut-and-paste inversion and 3-D velocity and attenuation models. The results show limited Compensated Linear Vector Dipole components, but considerable explosive isotropic components (5%–15% of the total moments) for approximately 50 earthquakes. Most of these events occur between the M_w6.4 foreshock and 1 day after the M_w7.1 mainshock and are mainly distributed around the rupture ends and fault intersections. The percentage of isotropic components is reduced considerably when data recorded by near-fault stations are not included in the inversions, highlighting the importance of near-fault data. The results suggest that high-frequency damage-related radiation and other local dilatational processes are responsible for the observed isotropic source terms.

Item Type:Article
Related URLs:
URLURL TypeDescription ItemEarthquake catalog of Ross et al.
http://scedc.caltech.eduRelated ItemSouthern California Earthquake Data Center
Cheng, Yifang0000-0002-6507-5607
Wang, Xin0000-0002-6180-0058
Zhan, Zhongwen0000-0002-5586-2607
Ben-Zion, Yehuda0000-0002-9602-2014
Additional Information:© 2021. American Geophysical Union. Issue Online: 25 September 2021; Version of Record online: 25 September 2021; Accepted manuscript online: 13 September 2021; Manuscript accepted: 01 September 2021; Manuscript revised: 26 July 2021; Manuscript received: 25 May 2021. The manuscript benefitted from useful comments by two anonymous referees and editor German Prieto. The research was supported by the Southern California Earthquake Center (based on NSF Cooperative Agreement EAR-1600087 and USGS Cooperative Agreement G17AC00047). Xin Wang acknowledges support from the Young Elite Scientists Sponsorship Program by CAST (Grant 2020QNRC001). Data Availability Statement: The employed earthquake catalog of Ross et al. (2019) is available online (at The used earthquake waveform data is available from the Southern California Earthquake Data Center ( The used moment tensor solutions are available through the supporting information (Datasets S1 and S2) and the Mendeley Data ( (Cheng et al., 2021).
Group:Seismological Laboratory
Funding AgencyGrant Number
Southern California Earthquake Center (SCEC)UNSPECIFIED
China Association for Science and Technology2020QNRC001
Issue or Number:18
Record Number:CaltechAUTHORS:20211006-153617768
Persistent URL:
Official Citation:Cheng, Y., Wang, X., Zhan, Z., & Ben-Zion, Y. (2021). Isotropic source components of events in the 2019 Ridgecrest, California, earthquake sequence. Geophysical Research Letters, 48, e2021GL094515.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:111236
Deposited By: Tony Diaz
Deposited On:06 Oct 2021 16:34
Last Modified:06 Oct 2021 16:35

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