Seismicity Pattern of the Great Sumatran Fault System from Hypocenter Relocation of Regional Seismic Network

Authors

  • Ade Surya Putra Doctoral Program of Geophysical Engineering, Institut Teknologi Bandung,, Indonesia
  • Andri Dian Nugraha Global Geophysics Research Group, FTTM, Institut Teknologi Bandung,, Indonesia
  • David Prambudi Sahara Global Geophysics Research Group, FTTM, Institut Teknologi Bandung,, Indonesia
  • Zulfakriza Zulfakriza Global Geophysics Research Group, FTTM, Institut Teknologi Bandung,, Indonesia
  • Antonius Nanang Tyasbudi Puspito Global Geophysics Research Group, FTTM, Institut Teknologi Bandung,, Indonesia
  • Faiz Muttaqy Doctoral Program of Geophysical Engineering, Institut Teknologi Bandung,, Indonesia
  • Pepen Supendi Agency for Meteorology, Climatology and Geophysics, Jalan Angkasa I, No.2, Kemayoran, Jakarta,, Indonesia
  • Daryono Daryono Agency for Meteorology, Climatology and Geophysics, Jalan Angkasa I, No.2, Kemayoran, Jakarta,, Indonesia

DOI:

https://doi.org/10.17014/ijog.10.1.83-95

Keywords:

Great Sumatra Fault, hypocenter, relocation, double-difference method

Abstract

The seismicity pattern along the Great Sumatran Fault (GSF) was analyzed during April 2009 - December 2017 period with magnitude of >3.0 and depth of < 30 km. Of 752 preliminary absolute locations, 695 were successfully relocated using double-difference method to provide an improved view of seismicity, sharpening locations and interpretations of seismogenic features throughout the region. The relocation results depict a pattern of significant increase on small to intermediate earthquakes occurring in a shallow part of northern Sumatra, i.e. the Aceh and Seulimeum segments, as well as in central Sumatra, i.e. the Toru and Barumun. This increase was interpreted due to indications of creeping that reduce or prevent stress build-up on these segments. Meanwhile, few segments, i.e. the Tripa segment in the northern part, then Suliti and Siulak segments in the central part, and Manna segment in the southern part of Sumatra show the least activities over the period. These segments were identified as lock asperity, which caused accumulating stress that could be released as an earthquake. The behaviour of these locking segments can be related to the seismic gap along the GSF which has not experienced major earthquakes (M>7) since 2000, making the densely populated area around these segments potentially have a great seismic hazard in the future.

Author Biographies

Ade Surya Putra, Doctoral Program of Geophysical Engineering, Institut Teknologi Bandung,

Currently Ade Surya Putra is a Ph.D student of Geophysical Engineering, Institut Teknologi Bandung. He got his Bachelor degree at Sriwijaya University, majoring physics and Master degree in Geophysical Engineering at Institut Teknologi Bandung. He has interest in geophysics, geology, and earthquake seismology.

Andri Dian Nugraha, Global Geophysics Research Group, FTTM, Institut Teknologi Bandung,

Dr. Andri Dian Nugraha, who in March 2020 received the mandate of the Academic Position of Professor in the field of seismology or to be precise seismic tomography at a relatively young age (41 years). He is also a lecturer at Global Geophysics Research Group, Institut Teknologi Bandung.

For Prof. Andri, the world of geophysics is not something new. This is evident from the geophysical education level which began in 1998 at the Geophysics Program, ITB, then continued to the Masters level in 2003 in the Earth Science Program. A year later after holding his Master's degree, Prof. Andri got the opportunity to continue his doctoral program in Seismology in Japan, to be precise at Kyoto University in 2006.

In his career, Prof. Andri has received several awards such as:

  1. HAGI award for Young and Bright Contribution in Geophysics (2013),
  2. ITB Achievement Lecturer in Research (2015),
  3. ITB Innovation Work Award (2017)

David Prambudi Sahara, Global Geophysics Research Group, FTTM, Institut Teknologi Bandung,

David P. Sahara received M.Sc degree from ITB, Indonesia, in 2011 and Ph.D degree from Karlsruhe Institute of Technology (KIT), Germany, in 2016. He became an Assistant Professor at Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology. He is also an Editor on Jurnal Geofisika by Himpunan Ahli Geofisika Indonesia (HAGI)

Zulfakriza Zulfakriza, Global Geophysics Research Group, FTTM, Institut Teknologi Bandung,

Currently, Zulfakriza affiliation is Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology. In addition, he is also a member of the Indonesian Geophysicists Association (HAGI). Zulfakriza received the M.Eng. and Dr. degrees from Institut Teknologi Bandung (ITB), in 2010 and 2016, respectively.

His research interests are processing and computation of seismic data, especially ambient noise seismic cross correlation, ambient noise seismic tomography, seismic hazard, earthquake seismology & disaster mitigation.

Antonius Nanang Tyasbudi Puspito, Global Geophysics Research Group, FTTM, Institut Teknologi Bandung,

Antonius Nanang Tyasbudi Puspito is a Professor at Global Geophysics Research Group, Institut Teknologi Bandung. He received the M.Sc from Hirosaki University, in 1990 and Ph.D from Tokyo University, in 1993, on Geophysics Program respectively .

He  has  received  several  important recognitions to his research career, such as:

  1. "Satya Lancana Karya Satya 30 tahun" from Indonesian Goverment in 2016,
  2. "Tanda Jasa Pengabdian 25 Tahun" from ITB in 2014.

Faiz Muttaqy, Doctoral Program of Geophysical Engineering, Institut Teknologi Bandung,

Currently Faiz Muttaqy is a Ph.D student of Geophysical Engineering, Institut Teknologi Bandung. He got his Bachelor degree at Gadjah Mada University, majoring Geophysics and Master degree in Geophysical Engineering at Institut Teknologi Bandung.

Pepen Supendi, Agency for Meteorology, Climatology and Geophysics, Jalan Angkasa I, No.2, Kemayoran, Jakarta,

Pepen Supendi works as a Geophysical Observer at the Bandung office of Meteorology, Climatology and Geophysics Agency (BMKG), also registered as a Geophysical Engineering Doctoral Program Student - FTTM - ITB in August 2017 and completed his doctoral program in less than 3 years with 21 international publications (SCOPUS).

Pepen Supendi, is not new to ITB. January 2012, he got the opportunity to study assignment at the Geophysical Engineering Study Program in the BMKG and ITB Collaboration Program, continuing from the D3 program of the Meteorology and Geophysics Academy (AMG) to undergraduate level. Early 2015, Pepen Supendi received another scholarship from the BMKG to continue his Masters in the Earth Science Study Program, Faculty of Earth Sciences and Technology - ITB.

Daryono Daryono, Agency for Meteorology, Climatology and Geophysics, Jalan Angkasa I, No.2, Kemayoran, Jakarta,

Daryono works as a Head Division of the Earthquake and Tsunami Mitigation at the central Meteorology, Climatology and Geophysics Agency (BMKG). He is an active researcher in the field of Geophysics and currently serves as the vice president of the Indonesian Geophysicists Association (HAGI). He completed a M.Sc degree at Udayana University (UNUD), and Doctor degree in the field of geography at Gadjah Mada University (UGM).

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Published

10-02-2023

How to Cite

Putra, A. S., Nugraha, A. D., Sahara, D. P., Zulfakriza, Z., Puspito, A. N. T., Muttaqy, F., … Daryono, D. (2023). Seismicity Pattern of the Great Sumatran Fault System from Hypocenter Relocation of Regional Seismic Network. Indonesian Journal on Geoscience, 10(1), 83–95. https://doi.org/10.17014/ijog.10.1.83-95

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