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Coseismic Slip Distribution of the 24 March 2011 Tarlay (Myanmar) Mw 6.8 Earthquake from ALOS PALSAR Interferometry

2013; Seismological Society of America; Volume: 103; Issue: 5 Linguagem: Inglês

10.1785/0120120365

1943-3573

Jianbao Sun, Zheng‐Kang Shen, Roland Bürgmann, Xiwei Xu,

Geological and Geochemical Analysis

Brief Report| October 01, 2013 Coseismic Slip Distribution of the 24 March 2011 Tarlay (Myanmar) Mw 6.8 Earthquake from ALOS PALSAR Interferometry Jianbao Sun; Jianbao Sun State Key Lab. of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, No. 1, Huayanli Jia, Chaoyang District, P.O.Box 9803, 100029 Beijing, Chinasunjianbao@gmail.com Search for other works by this author on: GSW Google Scholar Zheng‐Kang Shen; Zheng‐Kang Shen Department of Earth and Space Sciences, University of California, Los Angeles, 3806 Geology, 595 Charles Young Drive East, Los Angeles, CA 90095‐1567 *Also at Department of Geophysics, Peking University, No. 5 Yiheyuan Road, Haidian District, 100871 Beijing, China. Search for other works by this author on: GSW Google Scholar Roland Bürgmann; Roland Bürgmann Department of Earth & Planetary Science, University of California, Berkeley, 389 McCone Hall, Berkeley, California 94720‐4767 Search for other works by this author on: GSW Google Scholar Xiwei Xu Xiwei Xu Institute of Geology, China Earthquake Administration, No.1, Huayanli Jia, Chaoyang District, P.O.Box 9803, 100029 Beijing, China Search for other works by this author on: GSW Google Scholar Bulletin of the Seismological Society of America (2013) 103 (5): 2928–2936. https://doi.org/10.1785/0120120365 Article history first online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jianbao Sun, Zheng‐Kang Shen, Roland Bürgmann, Xiwei Xu; Coseismic Slip Distribution of the 24 March 2011 Tarlay (Myanmar) Mw 6.8 Earthquake from ALOS PALSAR Interferometry. Bulletin of the Seismological Society of America 2013;; 103 (5): 2928–2936. doi: https://doi.org/10.1785/0120120365 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 investigate coseismic deformation of the 24 March 2011 Mw 6.8 Tarlay, Myanmar, earthquake using ALOS PALSAR data from both descending and ascending passes. Using high‐quality synthetic aperture radar interferograms and amplitude‐offset images, the nearly linear surface rupture is well traced along the western end of the Nam Ma fault and strikes ∼69°. From both descending and ascending pass Interferometric Synthetic Aperture Radar data and a rigorous maximum a posteriori probabilistic inversion method, we infer that the event involved mostly a pure left‐lateral strike‐slip rupture with near‐vertical geometry. Our one‐segment model shows that the maximum slip of ∼4.1 m occurred at ∼4 km depth, much larger than the slip at the surface. Both interferograms also reveal a small segment to the east of the main rupture, in a densely populated farming area. Our inversion of a two‐segment model shows a similar slip distribution on the main fault, in addition to ∼0.1–0.3 m left‐lateral slip with normal component on a 58° north‐dipping segment. The total seismic moment from the two‐segment model is 1.95×1019 N·m, equivalent to an Mw 6.79 earthquake, which is comparable to the U.S. Geological Survey seismic inversion estimate of 2.10×1019 N·m (Mw 6.84). The earthquake occurred within a group of east‐northeast‐striking left‐lateral strike‐slip faults near the Myanmar–Laos border, which are seismically active and reflect a system of actively clockwise rotating blocks.Online Material: Figures of InSAR observations, amplitude‐offset maps, InSAR deformation decomposition, one segment model inversion residuals, single data set inversion results, and tectonic setting. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.