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Sources of Long‐Range Anthropogenic Noise in Southern California and Implications for Tectonic Tremor Detection

2018; Seismological Society of America; Linguagem: Inglês

10.1785/0120180130

1943-3573

Asaf Inbal, Tudor Cristea‐Platon, Jean‐Paul Ampuero, Gregor Hillers, Duncan Carr Agnew, S. E. Hough,

earthquake and tectonic studies

Research Article| October 16, 2018 Sources of Long‐Range Anthropogenic Noise in Southern California and Implications for Tectonic Tremor Detection Asaf Inbal; Asaf Inbal aDepartment of Geophysics, Tel Aviv University, Ramat‐Aviv, 69978 Tel‐Aviv, Israel, asafinbal@tauex.tau.ac.ilgAlso at the Berkeley Seismological Laboratory, University of California, Berkeley, California 94703. Search for other works by this author on: GSW Google Scholar Tudor Cristea‐Platon; Tudor Cristea‐Platon bDepartment of Mathematics, Massachusetts Institute of Technology (MIT), Headquarters Office Simons Building (Building 2), Room 106, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139‐4307, tudor.cristea.platon@gmail.com Search for other works by this author on: GSW Google Scholar Jean‐Paul Ampuero; Jean‐Paul Ampuero cUniversité Côte d'Azur, IRD, CNRS, Observatoire de la Côte d'Azur, UMR Géoazur–Campus Azur du CNRS, 250 rue Albert Einstein, CS 10269, F 06905 Sophia Antipolis, Cedex, France, ampuero@gps.caltech.eduhAlso at the Seismological Laboratory, California Institute of Technology, Pasadena, California. Search for other works by this author on: GSW Google Scholar Gregor Hillers; Gregor Hillers dInstitute of Seismology, University of Helsinki, PL 68 (Gustaf Hällströmin katu 2b), Helsinki 00014, Finland, gregor.hillers@helsinki.fi Search for other works by this author on: GSW Google Scholar Duncan Agnew; Duncan Agnew eScripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive, 0225, La Jolla, California 92093, dagnew@ucsd.edu Search for other works by this author on: GSW Google Scholar Susan E. Hough Susan E. Hough fU.S. Geological Survey, 525 South Wilson Avenue, Pasadena, California 91106‐3212, hough@usgs.gov Search for other works by this author on: GSW Google Scholar Bulletin of the Seismological Society of America (2018) 108 (6): 3511–3527. https://doi.org/10.1785/0120180130 Article history first online: 16 Oct 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation Asaf Inbal, Tudor Cristea‐Platon, Jean‐Paul Ampuero, Gregor Hillers, Duncan Agnew, Susan E. Hough; Sources of Long‐Range Anthropogenic Noise in Southern California and Implications for Tectonic Tremor Detection. Bulletin of the Seismological Society of America 2018;; 108 (6): 3511–3527. doi: https://doi.org/10.1785/0120180130 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract We study anthropogenic noise sources seen on seismic recordings along the central section of the San Jacinto fault near Anza, southern California. The strongest signals are caused by freight trains passing through the Coachella Valley north of Anza. Train‐induced transients are observed at distances of up to 50 km from the railway, with durations of up to 20 min, and spectra that are peaked between 3 and 5 Hz. Additionally, truck traffic through the Coachella Valley generates a sustained hum with a similar spectral signature as the train transients but with lower amplitude. We also find that wind turbine activity in northern Baja California introduces a seasonal modulation of 1– to 5‐Hz energy across the Anza network. We show that the observed train‐generated transients can be used to constrain shallow attenuation structure at Anza. Using the results from this study as well as available borehole data, we further evaluate the performance of approaches that have been used to detect nonvolcanic tremor at Anza. We conclude that signals previously identified as spontaneous tremor (Hutchison and Ghosh, 2017) were probably generated by other nontectonic sources such as trains. You do not currently have access to this article.