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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Widya Climago
Perdana, Yusuf Hadi
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Humanities Astronomy Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics Social Sciences Other

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Identification of Source Mechanisms for the August 5 2018 Mw 6.9 and the August 9 2018 Mw7.0 Lombok Earthquakes Priadi, Ramadhan; Perdana, Yusuf Hadi; Wijaya, Angga; Suardi, Iman
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.
ANOMALI GAS RADON SEBAGAI PREKURSOR GEMPABUMI DI SEKITAR SESAR PALUKORO Sulastri, Sulastri; Nursarifa, Saskia; Sunardi, Bambang; Rohadi, Supriyanto; Nugroho, Cahyo; Perdana, Yusuf Hadi
Jurnal Widya Climago Vol 2 No 2 (2020): Adaptasi Kebiasaan Baru
Publisher : Pusdiklat BMKG

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Abstract

Radon gas concentration anomalies before the occurrence of earthquakes have been detected in many majoearthquake cases in the world, so they can be considered as early signs or earthquake precursors. The BMKGhas installed a radon gas concentration measuring device equipped with gauges of air pressure, air temperatureand rainfallaround the Palukoro Fault, namely at the Tadulako Earthquake Precursor Station. This study aims todetermine the existence of earthquake precursors around the PaluKoro Fault recorded by the Tadulako PrecursorStation, by utilizing the radon and air pressure sensors installed at the station. The data used are radon data and air pressure data in 2016 as well as data on earthquake events that occurred around the Palukoro Fault in thesame year.The data analysis method was carried out in three stages. First, the selection of an earthquake with acertain distance from Tadulako, where the possibility of the radon precursor can still be detected. Second, analysiof radon data anomalies using statistical methods, namely outside the mean ± 2 standard deviations, and lookingat earthquake data that corresponds to the radon anomaly. Third, selecting radon anomalies which are consideredas earthquake precursors whose rate of change is inversely proportional to the rate of change in air pressureThe analysis results show 9 radon gas anomalies detected in the second step and 4 radon gas anomalies thatfulfill the third step. This method needs to be tested on radon and air pressure data from BMKG precursor stationselsewhere.
Co-Authors Angga Wijaya, Angga Bambang Sunardi, Bambang Cahyo Nugroho, Cahyo Nursarifa, Saskia Priadi, Ramadhan Suardi, Iman Sulastri Sulastri Supriyanto Rohadi, Supriyanto