Earthquake clusters analysis in Central and East Java region, Indonesia, based on hypocenter determination and relocation with waveform cross-correlation

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Authors

Faiz Muttaqy , Andri Dian Nugraha, Nanang T. Puspito, David P. Sahara, Zulfakriza Zulfakriza, Supriyanto Rohadi, Pepen Supendi

Abstract

The Central and East Java region, which is part of Sunda Arc, has relatively high seismicity rates due to the convergence between two major tectonic plates in Indonesia region, the Indo-Australian plate that subducts under the Eurasian plate. Many devastating earthquakes in the study area occurred as results of these plates interaction, such as the 1994 Banyuwangi earthquake (Mw 7.6) and the 2006 Yogyakarta earthquake (Mw 6.3). This study aims to determine the precise earthquake location and analyze the pattern of seismicity distribution around Central and East Java, Indonesia. We manually re-picked P and S-wave arrival time recorded by Agency for Meteorology, Climatology and Geophysics (BMKG) of Indonesia network for the times period of January 2009-September 2017. We then determined the earthquake location by a non-linear method. To improve the accuracy of earthquakes location, we relocated 1,127 out of 1,529 events using a double-difference algorithm with waveform cross-correlation data. Overall, the seismicity around Central and East Java regions are dominantly distributed in the south of the island, e.g. Kebumen, Yogyakarta, Pacitan, Malang, and Banyuwangi cluster. These clusters are probably related to the subduction activity. Meanwhile, the shallow depth earthquakes that are clustered in mainland indicate the activity of inland faults in the region, e.g. Opak Fault, Kendeng Thrust, and Rembang-Madura-Kangean-Sakala (RMKS) fault zone. Several other active inland faults have not shown significant seismicity over the times period, i.e., Pasuruan Fault, Lasem Fault, Muria Fault, Semarang Thrust, Probolinggo Fault, etc.

DOI

https://doi.org/10.31223/X5MS4F

Subjects

Earth Sciences, Geophysics and Seismology

Keywords

Hypocenter determination, waveform cross-correlation, relocation, central java, east java

Dates

Published: 2020-11-25 15:31

License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None

Data Availability (Reason not available):
The datasets supporting the conclusions of this article are included within the article and its additional files.

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