Original scientific paper

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

SEISMIC IMAGING BENEATH SUMATRA ISLAND AND ITS SURROUNDINGS, INDONESIA, FROM LOCAL-REGIONAL P-WAVE EARTHQUAKE TOMOGRAPHY

Bayu Pranata ; Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG), Jalan Angkasa I, No. 2, Kemayoran, Jakarta 10720, Indonesia
Mohamad Ramdhan orcid.org/0000-0002-3677-9883 ; Research Center for Geological Disaster, National Research and Innovation Agency (BRIN), KST Samaun Samadikun, Jl. Cisitu Sangkuriang, Bandung 40135, Indonesia
Muhammad Hanif orcid.org/0000-0003-3702-6995 ; Research Center for Geological Disaster, National Research and Innovation Agency (BRIN), KST Samaun Samadikun, Jl. Cisitu Sangkuriang, Bandung 40135, Indonesia
Muhammad Iqbal Sulaiman orcid.org/0009-0006-8536-6774 ; Luwu Disaster Management Agency (BPBD Kab. Luwu), Jl. Andi Djemma, Senga, Belopa, Kab. Luwu 91994, Indonesia
Mufti Putra Maulana orcid.org/0009-0004-7525-0263 ; School of Meteorology, Climatology, and Geophysics of Indonesia (STMKG), Jl. Perhubungan I No. 5, Pondok Betung, Tangerang Selatan 15221, Indonesia
Wandono Wandono ; School of Meteorology, Climatology, and Geophysics of Indonesia (STMKG), Jl. Perhubungan I No. 5, Pondok Betung, Tangerang Selatan 15221, Indonesia
Sri Widiyantoro orcid.org/0000-0002-8941-7173 ; Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung 40132, Indonesia
Sandy Kurniawan Suhardja ; University of Pertamina, Jl. Teuku Nyak Arief, Simprug, Kebayoran Lama, Jakarta 12220, Indonesia
Edi Hidayat orcid.org/0000-0003-0265-7420 ; Research Center for Geological Disaster, National Research and Innovation Agency (BRIN), KST Samaun Samadikun, Jl. Cisitu Sangkuriang, Bandung 40135, Indonesia
Pepen Supendi ; Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG), Jalan Angkasa I, No. 2, Kemayoran, Jakarta 10720, Indonesia
Ridwan Kusnandar ; Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG), Jalan Angkasa I, No. 2, Kemayoran, Jakarta 10720, Indonesia
Wiko Setyonegoro ; Research Center for Geological Disaster, National Research and Innovation Agency (BRIN), KST Samaun Samadikun, Jl. Cisitu Sangkuriang, Bandung 40135, Indonesia

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.

Keywords

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

Hrčak ID:

307311

URI

https://hrcak.srce.hr/307311

Publication date:

14.8.2023.

Article data in other languages: croatian

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