Seismic imaging beneath Sumatra Island and its surroundings, Indonesia, from local-regional P-wave earthquake tomography

Authors

  • Bayu Pranata Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG)
  • Mohamad Ramdhan Research Center for Geological Disaster, National Research and Innovation Agency (BRIN), Republic of Indonesia https://orcid.org/0000-0002-3677-9883
  • Muhammad Hanif Research Center for Geological Disaster, National Research and Innovation Agency (BRIN), Republic of Indonesia https://orcid.org/0000-0003-3702-6995
  • Muhammad Iqbal Sulaiman University of Pertamina https://orcid.org/0009-0006-8536-6774
  • Mufti Putra Maulana School of Meteorology, Climatology, and Geophysics of Indonesia (STMKG)
  • Wandono School of Meteorology, Climatology, and Geophysics of Indonesia (STMKG)
  • Sri Widiyantoro Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung https://orcid.org/0000-0002-8941-7173
  • Sandy Kurniawan Suhardja University of Pertamina
  • Edi Hidayat Research Center for Geological Disaster, National Research and Innovation Agency (BRIN), Republic of Indonesia https://orcid.org/0000-0003-0265-7420
  • Pepen Supendi Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG) https://orcid.org/0000-0002-9784-9865
  • Ridwan Kusnandar Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG)
  • Wiko Setyonegoro Research Center for Geological Disaster, National Research and Innovation Agency (BRIN), Republic of Indonesia https://orcid.org/0000-0002-3866-0261

DOI:

https://doi.org/10.17794/rgn.2023.3.10

Keywords:

Sumatra, BMKG, P– wave, tomography, slab, fault

Abstract

Sumatra Island and its surroundings, Indonesia, are one of the most active tectonics in the world. The Aceh-Andaman
earthquake, one of the most destructive earthquakes in the world, occurred there. It has attracted many earth scientists
to apply various methods, including seismic tomography, to understand the island’s subsurface structure and tectonic
system. This study is the first to delineate subsurface imaging beneath the island and its surroundings using a local-regional earthquake catalogue from the Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG) seismicnetwork. The tomographic imaging of P-wave (Vp) conducted in this study has successfully delineated subduction slabs (high Vp), partial melting zones (low Vp), volcanic arcs (low Vp), and Sumatran Fault zones (low Vp). The relationship
between the subduction zone and the volcanic arc on the island can be seen on several vertical sections where a partial
melting zone occurs at a depth of about 100 km, which functions as magma feeding for some volcanoes on the island. The oceanic slab model also exhibits a more pronounced and steeper slope towards the southern regions of Sumatra Island, possibly attributed to the slab’s aging process in that direction. The results highlight the importance of the BMKG seismic network in imaging local-regional subsurface structures beneath Indonesia’s archipelago, especially for the main islands such as Sumatra.

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Published

2023-08-14

How to Cite

Pranata, B., Ramdhan, M., Hanif, M., Sulaiman, M. I., Maulana, M. P., Wandono, Widiyantoro, S., Suhardja, S. K., Hidayat, E., Supendi, P., Kusnandar, R., & Setyonegoro, W. (2023). Seismic imaging beneath Sumatra Island and its surroundings, Indonesia, from local-regional P-wave earthquake tomography. Rudarsko-geološko-Naftni Zbornik, 38(3), 119–132. https://doi.org/10.17794/rgn.2023.3.10

Issue

Vol. 38 No. 3 (2023): No. 64

Section

Geology

License

Copyright (c) 2023 Dr. Bayu Pranata, Dr. Mohamad Ramdhan, Muhammad Hanif, Muhammad Iqbal Sulaiman, Mufti Putra Maulana, Dr. Wandono, Prof. Dr. Sri Widiyantoro, Dr. Sandy Kurniawan Suhardja, Dr. Edi Hidayat, Dr. Pepen Supendi, Ridwan Kusnandar, Wiko Setyonegoro

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