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Ambient Tectonic Tremor in the San Jacinto Fault, near the Anza Gap, Detected by Multiple Mini Seismic Arrays

2017; Seismological Society of America; Volume: 107; Issue: 5 Linguagem: Inglês

10.1785/0120160385

1943-3573

Alexandra Hutchison, Abhijit Ghosh,

Earthquake Detection and Analysis

Research Article| September 25, 2017 Ambient Tectonic Tremor in the San Jacinto Fault, near the Anza Gap, Detected by Multiple Mini Seismic Arrays Alexandra A. Hutchison; Alexandra A. Hutchison aDepartment of Earth Sciences, University of California, Riverside, Geology Building, 900 University Avenue, Riverside, California 92521, Ahutc002@ucr.edu, aghosh@ucr.edu Search for other works by this author on: GSW Google Scholar Abhijit Ghosh Abhijit Ghosh aDepartment of Earth Sciences, University of California, Riverside, Geology Building, 900 University Avenue, Riverside, California 92521, Ahutc002@ucr.edu, aghosh@ucr.edu Search for other works by this author on: GSW Google Scholar Author and Article Information Alexandra A. Hutchison aDepartment of Earth Sciences, University of California, Riverside, Geology Building, 900 University Avenue, Riverside, California 92521, Ahutc002@ucr.edu, aghosh@ucr.edu Abhijit Ghosh aDepartment of Earth Sciences, University of California, Riverside, Geology Building, 900 University Avenue, Riverside, California 92521, Ahutc002@ucr.edu, aghosh@ucr.edu Publisher: Seismological Society of America First Online: 27 Sep 2017 Online Issn: 1943-3573 Print Issn: 0037-1106 Bulletin of the Seismological Society of America (2017) 107 (5): 1985–1993. https://doi.org/10.1785/0120160385 Article history First Online: 27 Sep 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Alexandra A. Hutchison, Abhijit Ghosh; Ambient Tectonic Tremor in the San Jacinto Fault, near the Anza Gap, Detected by Multiple Mini Seismic Arrays. Bulletin of the Seismological Society of America 2017;; 107 (5): 1985–1993. doi: https://doi.org/10.1785/0120160385 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract We detect multiple short‐duration ambient tremor events in the San Jacinto fault near the Anza gap applying multiple independent detection and location methods, including multibeam backprojection (Ghosh, Vidale, Sweet, et al., 2009; Ghosh et al., 2012), envelope cross correlation (Wech and Creager, 2008), spectral analyses, and visual inspection of existing network stations and high‐density mini seismic array data. Different methods provide similar source locations for each of the tremor events in our catalog. All of the events have low‐peak slowness values, indicating that they originate from a deep source, aiding in the elimination of potential surface noise sources that may cause false detections. The tremor events are depleted of high‐frequency energy in the displacement‐amplitude spectrum compared with a small local earthquake at a similar location, a characteristic of tectonic tremor (Shelly et al., 2007). All tremor events are located near the northwestern boundary of the Anza gap, where the Hot Springs fault terminates. Recent studies may be interpreted to indicate that deep creep may occur at depth in this region (e.g., Lindsey et al., 2014; Jiang and Fialko, 2016; Meng and Peng, 2016). Another study by Inbal et al. (2017) provided evidence for a slow‐slip event in the Anza gap following the El Mayor–Cucapah earthquake, suggesting the potential for transient behavior in the region, for which we interpret tremor to be a seismic manifestation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.