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Coseismic slip distribution of the 2 July 2013 Mw 6.1 Aceh, Indonesia, earthquake and its tectonic implications

Endra Gunawan, Sri Widiyantoro, Shindy Rosalia, Mudrik Rahmawan Daryono, Irwan Meilano, Pepen Supendi, Takeo Ito, Takao Tabei, Fumiaki Kimata, Yusaku Ohta and Nazli Ismail
Coseismic slip distribution of the 2 July 2013 Mw 6.1 Aceh, Indonesia, earthquake and its tectonic implications
Bulletin of the Seismological Society of America (August 2018) 108 (4): 1918-1928

Abstract

This study investigates the coseismic slip distribution of the 2 July 2013 Mw 6.1 Aceh earthquake using Global Positioning System (GPS) data, measured geological surface offsets, and an aftershock distribution for a period of four days after the mainshock. We use the aftershock distribution to constrain the fault-plane strike of a right-lateral fault identified as the Pantan Terong segment. We estimate the coseismic slip distribution with dip angle information from the Global Centroid Moment Tensor (CMT) (model 1) and U.S. Geological Survey (USGS) (model 2) catalogs. We also estimate the coseismic slip distribution using another two fault models. Model 3 is constructed on a left-lateral fault, the Celala segment, which is perpendicular to the Aceh segment of the Sumatran fault, and model 4 is constructed using the multiple faults in models 2 and 3. We further estimate the coseismic slip distribution of this earthquake by employing an elastic dislocation model, inverting only the GPS displacements for model 3 and jointly inverting GPS displacements and geological surface offsets for models 1, 2, and 4. Minimum misfit between data and model is obtained with model 3, suggesting that the earthquake slip occurred along a left-lateral fault. Analysis of stress transfer caused by the 2013 earthquake indicates that the stress level along the Pantan Terong segment is >0.4 bar and the southeast part of Aceh segment was brought approximately 0.3 bar closer to failure, suggesting a possible earthquake occurrence in the future. This work demonstrates that the seismicity-derived fault plane fails to predict the surface displacement, and that the inferred Celala segment produces positive stress on Pantan Terong segment and potentially triggered all the aftershocks.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 108
Serial Issue: 4
Title: Coseismic slip distribution of the 2 July 2013 Mw 6.1 Aceh, Indonesia, earthquake and its tectonic implications
Affiliation: Bandung Institute of Technology, Bandung, Indonesia
Pages: 1918-1928
Published: 201808
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 48
Accession Number: 2018-081740
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
N03°00'00" - N05°00'00", E96°00'00" - E99°00'00"
Secondary Affiliation: Indonesian Institute of Science, IDN, IndonesiaIndonesian Agency for Meteorological, Climatological and Geophysics, IDN, IndonesiaNagoya University, JPN, JapanKochi University, JPN, JapanTono Research Institute of Earthquake Science, JPN, JapanTohoku University, JPN, JapanSyiah Kuala University, IDN, Indonesia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2018
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