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Shallow distributed faulting in the Imperial Valley, California, USA

Sahakian, Valerie J. and Derosier, Boe J. and Rockwell, Thomas K. and Stock, Joann M. (2022) Shallow distributed faulting in the Imperial Valley, California, USA. Geology, 50 (5). pp. 626-630. ISSN 0091-7613. doi:10.1130/g49572.1.

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In the tectonically complex Imperial Valley, California (USA), the Imperial fault (IF) is often considered to be the primary fault at the U.S.-Mexico border; however, its strain partitioning and interactions with other faults are not well understood. Despite inferred evidence of other major faults (e.g., seismicity), it is difficult to obtain a holistic view of this system due to anthropogenic surface modifications. To better define the structural configuration of the plate-boundary strain in this region, we collected high-resolution shallow seismic imaging data in the All American Canal, crossing the Imperial, Dixieland, and Michoacán faults. These data image shallow (<25 m) structures on and near the mapped trace of the Imperial fault, as well as the Michoacán fault and adjacent stepover. Integration of our data with nearby terrestrial cores provides age constraints on Imperial fault deformation. These data suggest that the Michoacán fault, unmapped in the United States, is active and likely produces dynamic or off-fault deformation within its stepover to the Dixieland fault. Together, these data support more strain partitioning than previously documented in this region.

Item Type:Article
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URLURL TypeDescription
Rockwell, Thomas K.0000-0001-5319-6447
Stock, Joann M.0000-0003-4816-7865
Additional Information:© 2022 Geological Society of America. Manuscript received 9 August 2021; Revised manuscript received 14 December 2021; Manuscript accepted 20 December 2021; Published online 8 March 2022. This work was funded by Southern California Earthquake Center grant #18119. We thank Neal Driscoll for the use of his CHIRP; Alistair Harding for discussions regarding the seismic data; Ray Weldon and Becky Dorsey for feedback; Brian Oller and Alexis Klimasewski for help with data collection; Socrates Gonzalez and Robert Pacheco (Imperial Irrigation District], Imperial, California) for their support of the study; and many other IID employees who gave their time to aid in data collection. We thank Aron Meltzner, an anonymous reviewer, and editor William Clyde for their thorough reviews, which improved this manuscript.
Group:Seismological Laboratory
Funding AgencyGrant Number
Southern California Earthquake Center (SCEC)18119
Issue or Number:5
Record Number:CaltechAUTHORS:20220422-974200
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Official Citation:Valerie J. Sahakian, Boe J. Derosier, Thomas K. Rockwell, Joann M. Stock; Shallow distributed faulting in the Imperial Valley, California, USA. Geology 2022; 50 (5): 626–630. doi:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114416
Deposited By: Tony Diaz
Deposited On:25 Apr 2022 19:03
Last Modified:26 Apr 2022 17:10

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