The Sunda arc is one of the most active tectonic regions, which has a complex tectonic setting due to different tectonic regimes and subduction geometry along this arc. We analyzed variation in b-value for this region in order to obtain better information regarding the state of stress in this region. For the first step, we relocated earthquake hypocenters taken from the BMKG catalog for the period 2009 – 2015 by employing a teleseismic double-difference (DD) relocation method and using a 3D velocity model. There are 10,440 earthquakes that were successfully relocated with greatly reduced residual errors. Based on its tectonic feature and earthquake distribution, we divided the study area into 8 regions, i.e. northern Sumatra, central Sumatra, southern Sumatra, Sunda strait, western Java, eastern Java, lesser Sunda islands, and Sunda-Banda transition zone. For b-value analysis we combined the BMKG catalog with the International Seismological Centre (ISC) catalog from 2006 to 2009 to obtain a longer time period. We analyzed the spatial variation in b-value for western sunda arc and found a low b-value that matches well with earthquake locations.
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6 May 2016
THE 5TH INTERNATIONAL SYMPOSIUM ON EARTHHAZARD AND DISASTER MITIGATION: The Annual Symposium on Earthquake and Related Geohazard Research for Disaster Risk Reduction
19–20 October 2015
Bandung, Indonesia
Research Article|
May 06 2016
Analysis of spatiotemporal variation in b-value for the Sunda arc using high precision earthquake location
Andri Dian Nugraha;
Andri Dian Nugraha
1Global Geophysical Research Group, Faculty of Mining and Petroleum Engineering,
Institut Teknologi Bandung
, Indonesia
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Hasbi Ash Shiddiqi;
Hasbi Ash Shiddiqi
a)
2Earth Sciences Graduate Program, Faculty of Earth Sciences and Technology,
Institut Teknologi Bandung
, Indonesia
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Sri Widiyantoro;
Sri Widiyantoro
3Agency for Meteorology,
Climatology and Geophysics (BMKG)
, Jakarta, Indonesia
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Sutiyono;
Sutiyono
3Agency for Meteorology,
Climatology and Geophysics (BMKG)
, Jakarta, Indonesia
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Titi Handayani
Titi Handayani
3Agency for Meteorology,
Climatology and Geophysics (BMKG)
, Jakarta, Indonesia
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a)
Corresponding author: [email protected]
AIP Conf. Proc. 1730, 020003 (2016)
Citation
Andri Dian Nugraha, Hasbi Ash Shiddiqi, Sri Widiyantoro, Sutiyono, Titi Handayani; Analysis of spatiotemporal variation in b-value for the Sunda arc using high precision earthquake location. AIP Conf. Proc. 6 May 2016; 1730 (1): 020003. https://doi.org/10.1063/1.4947371
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