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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Sunan Kalijaga Journal of Physics
Budiarta
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Astronomy Earth & Planetary Sciences Education Electrical & Electronics Engineering Materials Science & Nanotechnology Physics

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Study of Earthquake Damage Potential Based on b-Value Variation in The Special Region of Yogyakarta: Studi Potensi Kerusakan Gempa Bumi Berdasarkan Variasi Nilai B Di Daerah Istimewa Yogyakarta Wiyono, Wiyono; Budiarta; Herwiningsih, Sri; Nugraha, Aditya Prawira
Sunan Kalijaga Journal of Physics Vol. 6 No. 2 (2024): Sunan Kalijaga Journal of Physics
Publisher : Prodi Fisika Fakultas Sains dan Teknologi UIN Sunan Kalijaga Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/physics.v6i2.5156

Abstract

Indonesia is a region prone to various natural disasters, including earthquakes. It is located at the convergence of three major tectonic plates: the Eurasian Plate, the Indo-Australian Plate, and the Pacific Plate. The collision of these three plates causes earthquakes. The Special Region of Yogyakarta is one of the areas that has been impacted multiple times by damaging earthquakes due to its proximity to the meeting point of the Eurasian and Indo-Australian Plates. This study was conducted to examine earthquake statistics in the Special Region of Yogyakarta based on analyses of a-value and b-value in this area, thereby identifying potential earthquake recurrence. Secondary data from the IRIS (Incorporated Research Institutions for Seismology) earthquake catalog from 2006 to 2020 were used for this seismic analysis. The data processing results showed that a-values ranged between 3.5 and 7, with an average value across the entire region of 5.17; meanwhile, b-values ranged between 0.7 and 1.2, with an average value across all areas being 0.775. The area requiring caution is the southern sea region of Special Region Yogyakarta, which has potential for earthquakes with magnitudes up to 6 occurring within intervals of every 5–10 years.
Identification of Fault Characteristics in the 2021 Ambarawa Swarm Earthquake Based On Focal Mechanism Analysis Ramadhani, Muhammad Rizal; Khafidh Nur Aziz; Budiarta
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 15 No. 2 (2025)
Publisher : Universitas Negeri Surabaya

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Abstract

Swarm earthquakes occur repeatedly within a certain time frame and occur in the same location with small earthquake strengths. A swarm earthquake occurred in the Ambarawa region of Central Java from October to November 2021. This research aims to determine the characteristics of new faults and the causes of fault activity in the 2021 Ambarawa earthquake. The method used in determining the characteristics of faults that cause swarm earthquakes is P wave first motion polarity recorded by the seismograph. A total of 7 earthquake data were analyzed using the P-wave first motion polarity method which produced compression/dilation data, azimuthal angle, and take-off angle. Analysis of the focal mechanism using compression/dilatation data, azimuthal angle, and take-off angle produces strike, dip, and rake values. The strike value in the focal mechanism of the 2021 Ambarawa earthquake ranges from N 54°, N 69°, N 168° to N 208°, and N 292°. The dip value in the focal mechanism of the 2021 Ambarawa earthquake has a value of 40° to 88°. The rake value in the focal mechanism of the 2021 Ambarawa earthquake has a negative value, indicating that it is a type of normal fault. The characteristics of the cause of the earthquake are caused by local faults in the Telomoyo Volcano area with normal fault types and shear faults. Local fault activity is indicated by the local pressure on the geothermal reservoir that flows magma fluid from the reservoir to the surface.
Co-Authors Khafidh Nur Aziz Nugraha, Aditya Prawira Ramadhani, Muhammad Rizal Sri Herwiningsih Wiyono wiyono