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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards)
Yusuf Hadi Perdana
Badan Meteorologi Klimatologi dan Geofisika
Astronomy Earth & Planetary Sciences Education Environmental Science Materials Science & Nanotechnology Physics

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Analisis Sumber Gempa Bumi Lebak 23 Januari 2018 Tio Azhar Prakoso Setiadi; Marlita Aulia Rahman; Yusuf Hadi Perdana; Agustya Adi Martha; Nova Heryandoko; Supriyanto Rohadi
Jurnal Lingkungan dan Bencana Geologi Vol 10, No 3 (2019)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1650.592 KB) | DOI: 10.34126/jlbg.v10i3.254

Abstract

Gempa bumi tektonik 23 Januari 2018 berkekuatan M 6,1 telah mengguncang wilayah Lebak  dan sekitarnya. Guncangan gempa bumi ini berdampak berrisiko yang cukup serius. Menjadi perhatian dari peristiwa ini adalah pusat gempa bumnyai berada di laut pada  zona sesar Cimandiri sebagai kelanjutan dari zona sesar yang berada di daratan. Penelitian ini berhasil melakukan relokasi episenter dan hiposenter gempa bumi bersumber dari BMKG dari tanggal 23 hingga 28 Januari 2018 sebanyak 62 kejadian gempa bumi, menentukan bidang sesarnya, dan perkiraan transfer tekanan Coulomb gempa bumi utama (mainshock). Relokasi hiposentrum gempa bumi menunjukan adanya lineasi sumber gempa bumi yang mengarah baratdaya-timurlaut dan berasosiasi dengan terusan zona sesar Cimandiri ke arah arah daratan di Teluk Pelabuhan Ratu. Pengolahan HC-plot dapat menentukan bidang sesar sebenarnya pada gempa bumi Lebak yaitu bidang nodal 2 dengan nilai jurus N 41.79° E, kemiringan 81.4°, rake 43.9°. Selain itu analisis perubahan nilai tekanan Coulomb gempa bumi menunjukkan pengaruh gempa bumi utama yang menyebabkan terjadinya gempa bumi susulan di sekitar wilayah sumber.
Identification of Source Mechanisms for the August 5 2018 Mw 6.9 and the August 9 2018 Mw7.0 Lombok Earthquakes Ramadhan Priadi; Yusuf Hadi Perdana; Angga Wijaya; Iman Suardi
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 10 No. 1 (2020)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v10n1.p44-55

Abstract

A series of earthquakes with magnitudes ranging from 5.8 to 7.0 occurred in Lombok in the period of July to August 2018. Two events occurred consecutively, the 6.9 on August 5, 2018 (11:46:38 UTC), and the 7.0 on August 9, 2018 (14:56:28 UTC). Those phenomena are rare because earthquakes usually require a relatively long time to accumulate their energies before being released. Because of those events, so an explanation is needed to explain what happened at the source. In this context, this study aims to determine the relations between the events based on the asperity zone and the slip distributions. Modeling was performed using teleseismic data and seismic inversion of body waves at low frequencies. The result shows that the asperity zone of 6.9 is at 0 km in a strike-direction and -18 km wide in a dip-direction with a maximum slip of 1.3 m, whereas, for the 7.0 event, the asperity zone is at -36 km in the direction of the strike and -7 km in the direction of the dip. Both events have the asperity in the up-dip section with an upward slip distribution towards the up-dip. The slip distribution of the first event and the second one has a relationship because the 6.9 earthquake slip leads to the 7.0 earthquake fault plane. The relation is suspected to be due to the weakening of rock conditions and an enlargement that is limited by space and time during the earthquake. As a result, those two earthquakes are closely related to stress distribution, forming a new asperity zone.
Co-Authors Agustya Adi Martha Angga Wijaya Iman Suardi Marlita Aulia Rahman Nova Heryandoko Ramadhan Priadi Supriyanto Rohadi Tio Azhar Prakoso Setiadi