Active convergence of the India‐Burma‐Sunda plates revealed by a new continuous GPS network

The Rakhine (Arakan)‐Bangladesh megathrust, along which the Indian and Burma plates collide, is assumed by some to be inactive/aseismic due to the lack of notable interplate earthquakes in the modern instrumental catalog. However, geological and historical evidence of the great 1762 Arakan earthquak...

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Main Authors: Mallick, Rishav, Feng, Lujia, Hubbard, Judith, Banerjee, Paramesh, Lindsey, Eric Ostrom, Hill, Emma Mary
Other Authors: Asian School of the Environment
Format: Article
Language:English
Published: 2019
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Online Access:https://hdl.handle.net/10356/89171
http://hdl.handle.net/10220/49332
https://doi.org/10.21979/N9/7XTLF0
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-891712021-01-18T04:50:17Z Active convergence of the India‐Burma‐Sunda plates revealed by a new continuous GPS network Mallick, Rishav Feng, Lujia Hubbard, Judith Banerjee, Paramesh Lindsey, Eric Ostrom Hill, Emma Mary Asian School of the Environment Earth Observatory of Singapore India‐Burma Convergence Oblique Convergence Science::Geology The Rakhine (Arakan)‐Bangladesh megathrust, along which the Indian and Burma plates collide, is assumed by some to be inactive/aseismic due to the lack of notable interplate earthquakes in the modern instrumental catalog. However, geological and historical evidence of the great 1762 Arakan earthquake suggest the megathrust can produce M~8 events that could adversely affect the lives of millions of people in the region. To investigate the seismogenic potential and determine the slip budget of the megathrust, we first need to solve for India‐Burma‐Sunda relative plate motions. We present a new set of 24 GPS velocities (2011–2017) from the Myanmar‐India‐Bangladesh‐Bhutan continuous GPS network. We use the new velocities and those from previously published studies to explore the geometries and slip rates of three major faults (Rakhine‐Bangladesh megathrust, Churachandpur‐Mao Fault, and Sagaing Fault) that accommodate the India‐Burma‐Sunda plate motion. Our results suggest that the three major faults we studied are likely fully coupled; the modern shortening rate across the Burma plate is 12–24 mm/year, while the total dextral shear rate is 25–32 mm/year. The possibly fully coupled shallow megathrust, and splay faults that may sole into it, are geodetically invisible while they are not slipping. However, we can identify the transition from coupling to steady creep on the deeper extension of the megathrust; we use this to show active oblique India‐Burma convergence and to map along‐strike and along‐dip variations in dip‐slip and strike‐slip motion. This implies that the megathrust is currently accumulating strain which will eventually be released in earthquakes. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2019-07-12T06:02:04Z 2019-12-06T17:19:27Z 2019-07-12T06:02:04Z 2019-12-06T17:19:27Z 2019 Journal Article Mallick, R., Lindsey, E. O., Feng, L., Hubbard, J., Banerjee, P., & Hill, E. M. (2019). Active convergence of the India‐Burma‐Sunda plates revealed by a new continuous GPS network. Journal of Geophysical Research: Solid Earth, 124(3), 3155-3171. doi:10.1029/2018JB016480 2169-9356 https://hdl.handle.net/10356/89171 http://hdl.handle.net/10220/49332 10.1029/2018JB016480 en Journal of Geophysical Research: Solid Earth https://doi.org/10.21979/N9/7XTLF0 © 2019 The Author(s). This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made. 17 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic India‐Burma Convergence
Oblique Convergence
Science::Geology
spellingShingle India‐Burma Convergence
Oblique Convergence
Science::Geology
Mallick, Rishav
Feng, Lujia
Hubbard, Judith
Banerjee, Paramesh
Lindsey, Eric Ostrom
Hill, Emma Mary
Active convergence of the India‐Burma‐Sunda plates revealed by a new continuous GPS network
description The Rakhine (Arakan)‐Bangladesh megathrust, along which the Indian and Burma plates collide, is assumed by some to be inactive/aseismic due to the lack of notable interplate earthquakes in the modern instrumental catalog. However, geological and historical evidence of the great 1762 Arakan earthquake suggest the megathrust can produce M~8 events that could adversely affect the lives of millions of people in the region. To investigate the seismogenic potential and determine the slip budget of the megathrust, we first need to solve for India‐Burma‐Sunda relative plate motions. We present a new set of 24 GPS velocities (2011–2017) from the Myanmar‐India‐Bangladesh‐Bhutan continuous GPS network. We use the new velocities and those from previously published studies to explore the geometries and slip rates of three major faults (Rakhine‐Bangladesh megathrust, Churachandpur‐Mao Fault, and Sagaing Fault) that accommodate the India‐Burma‐Sunda plate motion. Our results suggest that the three major faults we studied are likely fully coupled; the modern shortening rate across the Burma plate is 12–24 mm/year, while the total dextral shear rate is 25–32 mm/year. The possibly fully coupled shallow megathrust, and splay faults that may sole into it, are geodetically invisible while they are not slipping. However, we can identify the transition from coupling to steady creep on the deeper extension of the megathrust; we use this to show active oblique India‐Burma convergence and to map along‐strike and along‐dip variations in dip‐slip and strike‐slip motion. This implies that the megathrust is currently accumulating strain which will eventually be released in earthquakes.
author2 Asian School of the Environment
author_facet Asian School of the Environment
Mallick, Rishav
Feng, Lujia
Hubbard, Judith
Banerjee, Paramesh
Lindsey, Eric Ostrom
Hill, Emma Mary
format Article
author Mallick, Rishav
Feng, Lujia
Hubbard, Judith
Banerjee, Paramesh
Lindsey, Eric Ostrom
Hill, Emma Mary
author_sort Mallick, Rishav
title Active convergence of the India‐Burma‐Sunda plates revealed by a new continuous GPS network
title_short Active convergence of the India‐Burma‐Sunda plates revealed by a new continuous GPS network
title_full Active convergence of the India‐Burma‐Sunda plates revealed by a new continuous GPS network
title_fullStr Active convergence of the India‐Burma‐Sunda plates revealed by a new continuous GPS network
title_full_unstemmed Active convergence of the India‐Burma‐Sunda plates revealed by a new continuous GPS network
title_sort active convergence of the india‐burma‐sunda plates revealed by a new continuous gps network
publishDate 2019
url https://hdl.handle.net/10356/89171
http://hdl.handle.net/10220/49332
https://doi.org/10.21979/N9/7XTLF0
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