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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Widya Climago Jurnal Stasiun Geofisika Sleman (JSGS)
Perdana, Yusuf Hadi
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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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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.
PENGGUNAAN SOTWARE GMT 6 DAN PYTHON UNTUK MENAMPILKAN PETA SEISMISITAS DAN MENGHITUNG BESAR SUDUT SUBDUKSI DIPULAU JAWA TAHUN 2021 Maulina Putri Lestari; Budiarta, Budiarta; Perdana, Yusuf Hadi
Jurnal Stasiun Geofisika Sleman Vol. 1 No. 2 (2023): Jurnal Stasiun Geofisika Sleman (JSGS)
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

Mapping the seismicity of an area, especially in subduction areas which are prone to earthquakes such as Java, is needed in order to prove the existence of natural activities in the form of plate shifts and identify faults and lead people to be aware of possible disasters in the same area. In this context, research was carried out with the aim of making seismicity maps, cross sections, and focal mechanisms in the Java region using GMT 6 software and using the PYTHON programming language and script processing software in the form of ANACONDA. Then, area slices were made and subduction angles were calculated for each slice segment. The data used in this study is secondary data sourced from the BMKG and USGS with the data collection range from January to December 2021. The area taken is at coordinates 10.99° LS – 5.50° LS and 105.100° E – 115.145° E. Based on the analysis results obtained on the cross section map, there is evidence that in Java this is a plate subduction path marked by a decrease in the hypocenter of the earthquake. The mapped focal mechanism shows that the Java area is dominated by thrust faults. Earthquakes that occur very often are those with a small magnitude category, namely on a scale of 3-5 with a shallow depth of around 0-60 km. Plate shifts show that the steeper the plate, the older the subduction angle. The size of the angle according to BMKG data for 2021 for each slice segment is segment A-A' 75.7° – 80.1°, B-B' 80.8° – 82.7°, C-C' 69.8 ° – 75.2°, and D-D' 80.6° – 82.9°
Co-Authors Angga Wijaya, Angga Bambang Sunardi, Bambang Budiarta, Budiarta Cahyo Nugroho, Cahyo Maulina Putri Lestari Nursarifa, Saskia Priadi, Ramadhan Suardi, Iman Sulastri Sulastri Supriyanto Rohadi, Supriyanto