Aseismic plate boundary in the Indo-Burmese wedge, northwest Sunda Arc

Abstract

Research Article| February 01, 2013 Aseismic plate boundary in the Indo-Burmese wedge, northwest Sunda Arc Vineet K. Gahalaut; Vineet K. Gahalaut * 1CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500606, Andhra Pradesh, India *E-mail: [e-mail]. Search for other works by this author on: GSW Google Scholar Bhaskar Kundu; Bhaskar Kundu 1CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500606, Andhra Pradesh, India Search for other works by this author on: GSW Google Scholar Sunil Singh Laishram; Sunil Singh Laishram 2Department of Earth Sciences, Manipur University, Canchipur, Imphal 795003, India Search for other works by this author on: GSW Google Scholar Joshi Catherine; Joshi Catherine 1CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500606, Andhra Pradesh, India Search for other works by this author on: GSW Google Scholar Arun Kumar; Arun Kumar 2Department of Earth Sciences, Manipur University, Canchipur, Imphal 795003, India Search for other works by this author on: GSW Google Scholar M. Devchandra Singh; M. Devchandra Singh 2Department of Earth Sciences, Manipur University, Canchipur, Imphal 795003, India Search for other works by this author on: GSW Google Scholar R.P. Tiwari; R.P. Tiwari 3Department of Geology, Mizoram University, Aizwal, Mizoram 796009, India Search for other works by this author on: GSW Google Scholar R.K. Chadha; R.K. Chadha 1CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500606, Andhra Pradesh, India Search for other works by this author on: GSW Google Scholar S.K. Samanta; S.K. Samanta 4Department of Geological Sciences, Jadavpur University, 188 Raja S.C. Mullik Road, Kolkata 700032, India Search for other works by this author on: GSW Google Scholar A. Ambikapathy; A. Ambikapathy 1CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500606, Andhra Pradesh, India Search for other works by this author on: GSW Google Scholar P. Mahesh; P. Mahesh 1CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500606, Andhra Pradesh, India Search for other works by this author on: GSW Google Scholar Amit Bansal; Amit Bansal 1CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500606, Andhra Pradesh, India Search for other works by this author on: GSW Google Scholar M. Narsaiah M. Narsaiah 1CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500606, Andhra Pradesh, India Search for other works by this author on: GSW Google Scholar Geology (2013) 41 (2): 235–238. https://doi.org/10.1130/G33771.1 Article history received: 21 Jun 2012 rev-recd: 19 Aug 2012 accepted: 20 Sep 2012 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Vineet K. Gahalaut, Bhaskar Kundu, Sunil Singh Laishram, Joshi Catherine, Arun Kumar, M. Devchandra Singh, R.P. Tiwari, R.K. Chadha, S.K. Samanta, A. Ambikapathy, P. Mahesh, Amit Bansal, M. Narsaiah; Aseismic plate boundary in the Indo-Burmese wedge, northwest Sunda Arc. Geology 2013;; 41 (2): 235–238. doi: https://doi.org/10.1130/G33771.1 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 SocietyGeology Search Advanced Search Abstract Plate motion, crustal deformation, and earthquake occurrence processes in the northwest Sunda Arc, which includes the Indo-Burmese wedge (IBW) in the forearc and the Sagaing fault in the backarc, are very poorly constrained. Plate reconstruction models and geological structures in the region suggest that subduction in the IBW occurred in the geological past, but whether it is still active and how the plate motion between the India and Sunda plates is partitioned between motion in the IBW and Sagaing fault is largely unknown. Recent GPS measurements of crustal deformation and available long-term rates of motion across the Sagaing fault suggest that ∼20 ± 3 mm/yr of the relative plate motion of ∼36 mm/yr between the India and Sunda plates is accommodated at the Sagaing fault through dextral strike-slip motion. We report results from a dense GPS network in the IBW that has operated since 2004. Our analysis of these measurements and the seismicity of the IBW suggest that the steeply dipping Churachandpur-Mao fault in the IBW accommodates the remaining motion of ∼18 ± 2 mm/yr between the India and Sunda plates through dextral strike-slip motion, and this motion occurs predominantly through velocity strengthening frictional behavior, i.e., aseismic slip. The aseismic motion on this plate boundary fault significantly lowers the seismic hazard due to major and great interplate earthquakes along this plate boundary. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.