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Title: Imaging of 3-D seismic velocity structure of Southern Sumatra region using double difference tomographic method

Abstract

Southern Sumatra region has a high level of seismicity due to the influence of the subduction system, Sumatra fault, Mentawai fault and stretching zone activities. The seismic activities of Southern Sumatra region are recorded by Meteorological Climatological and Geophysical Agency (MCGA’s) Seismograph network. In this study, we used earthquake data catalog compiled by MCGA for 3013 events from 10 seismic stations around Southern Sumatra region for time periods of April 2009 – April 2014 in order to invert for the 3-D seismic velocities structure (Vp, Vs, and Vp/Vs ratio). We applied double-difference seismic tomography method (tomoDD) to determine Vp, Vs and Vp/Vs ratio with hypocenter adjustment. For the inversion procedure, we started from the initial 1-D seismic velocity model of AK135 and constant Vp/Vs of 1.73. The synthetic travel time from source to receiver was calculated using ray pseudo-bending technique, while the main tomographic inversion was applied using LSQR method. The resolution model was evaluated using checkerboard test and Derivative Weigh Sum (DWS). Our preliminary results show low Vp and Vs anomalies region along Bukit Barisan which is may be associated with weak zone of Sumatran fault and migration of partial melted material. Low velocity anomalies at 30-50 km depth inmore » the fore arc region may indicated the hydrous material circulation because the slab dehydration. We detected low seismic seismicity in the fore arc region that may be indicated as seismic gap. It is coincides contact zone of high and low velocity anomalies. And two large earthquakes (Jambi and Mentawai) also occurred at the contact of contrast velocity.« less

Authors:
 [1]
  1. Meteorological Climatological and Geophysical Agency (MCGA), Jalan Angkasa I No.2 Kemayoran, Jakarta Pusat, 10720 (Indonesia)
Publication Date:
OSTI Identifier:
22391575
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1658; Journal Issue: 1; Conference: ISEDM 2014: 4. International Sympsoium on Earthquake and Disaster Mitigation 2014, Bandung (Indonesia), 11-12 Nov 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; BENDING; DEHYDRATION; EARTHQUAKES; GEOPHYSICS; HYPOCENTERS; METEOROLOGY; SEISMICITY; SEISMOGRAPHS; SEISMOLOGY; SLABS; TOMOGRAPHY; VELOCITY; ZONES

Citation Formats

Lestari, Titik, Faculty of Earth Science and Technology, Bandung Institute of Technology, Jalan Ganesa No.10, Bandung 40132, and Nugraha, Andri Dian, E-mail: nugraha@gf.itb.ac.id. Imaging of 3-D seismic velocity structure of Southern Sumatra region using double difference tomographic method. United States: N. p., 2015. Web. doi:10.1063/1.4915022.
Lestari, Titik, Faculty of Earth Science and Technology, Bandung Institute of Technology, Jalan Ganesa No.10, Bandung 40132, & Nugraha, Andri Dian, E-mail: nugraha@gf.itb.ac.id. Imaging of 3-D seismic velocity structure of Southern Sumatra region using double difference tomographic method. United States. https://doi.org/10.1063/1.4915022
Lestari, Titik, Faculty of Earth Science and Technology, Bandung Institute of Technology, Jalan Ganesa No.10, Bandung 40132, and Nugraha, Andri Dian, E-mail: nugraha@gf.itb.ac.id. 2015. "Imaging of 3-D seismic velocity structure of Southern Sumatra region using double difference tomographic method". United States. https://doi.org/10.1063/1.4915022.
@article{osti_22391575,
title = {Imaging of 3-D seismic velocity structure of Southern Sumatra region using double difference tomographic method},
author = {Lestari, Titik and Faculty of Earth Science and Technology, Bandung Institute of Technology, Jalan Ganesa No.10, Bandung 40132 and Nugraha, Andri Dian, E-mail: nugraha@gf.itb.ac.id},
abstractNote = {Southern Sumatra region has a high level of seismicity due to the influence of the subduction system, Sumatra fault, Mentawai fault and stretching zone activities. The seismic activities of Southern Sumatra region are recorded by Meteorological Climatological and Geophysical Agency (MCGA’s) Seismograph network. In this study, we used earthquake data catalog compiled by MCGA for 3013 events from 10 seismic stations around Southern Sumatra region for time periods of April 2009 – April 2014 in order to invert for the 3-D seismic velocities structure (Vp, Vs, and Vp/Vs ratio). We applied double-difference seismic tomography method (tomoDD) to determine Vp, Vs and Vp/Vs ratio with hypocenter adjustment. For the inversion procedure, we started from the initial 1-D seismic velocity model of AK135 and constant Vp/Vs of 1.73. The synthetic travel time from source to receiver was calculated using ray pseudo-bending technique, while the main tomographic inversion was applied using LSQR method. The resolution model was evaluated using checkerboard test and Derivative Weigh Sum (DWS). Our preliminary results show low Vp and Vs anomalies region along Bukit Barisan which is may be associated with weak zone of Sumatran fault and migration of partial melted material. Low velocity anomalies at 30-50 km depth in the fore arc region may indicated the hydrous material circulation because the slab dehydration. We detected low seismic seismicity in the fore arc region that may be indicated as seismic gap. It is coincides contact zone of high and low velocity anomalies. And two large earthquakes (Jambi and Mentawai) also occurred at the contact of contrast velocity.},
doi = {10.1063/1.4915022},
url = {https://www.osti.gov/biblio/22391575}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1658,
place = {United States},
year = {Fri Apr 24 00:00:00 EDT 2015},
month = {Fri Apr 24 00:00:00 EDT 2015}
}