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Contact Name
Bambang Sunardi
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jurnalstageofsleman@gmail.com
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+6282124158232
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jurnalstageofsleman@gmail.com
Editorial Address
Jl. Wates Km. 8, Jitengan, Balecatur, Gamping, Sleman, Daerah Istimewa Yogyakarta 55295
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Kab. sleman,
Daerah istimewa yogyakarta
INDONESIA
Jurnal Stasiun Geofisika Sleman (JSGS)
Published by Stasiun Geofisika Kelas I Sleman
ISSN : -     EISSN : 30263875     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
Jurnal Stasiun Geofisika Sleman (JSGS) diterbitkan oleh Stasiun Geofisika Kelas I Sleman sebagai media apresiasi Karya Tulis Ilmiah (KTI) yang bersumber dari kegiatan penelitian berbasis ilmu-ilmu Meteorologi, Klimatologi, Kualitas udara, dan Geofisika (MKKuG).
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 32 Documents
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Analisis Variasi b-value dan a-value Menggunakan Perangkat Lunak ZMAP Sebagai Indikator Potensi Gempabumi di Wilayah Jawa Timur: Analysis of b-value and a-value Variations Using ZMap Software as an Indicator of Earthquake Potential in the East Java Region Saefurohmah, Mufti; Susanti, Dwi Budi; Sugito, Sugito; Maulita, Ika
Jurnal Stasiun Geofisika Sleman Vol. 3 No. 2 (2025): Jurnal Stasiun Geofisika Sleman (JSGS) - Desember 2025
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

East Java is one of Indonesia's regions with a high level of seismicity due to its proximity to the subduction zone and the presence of active local faults. This study aims to analyze seismotectonic parameters, including a-value and b-value, as indicators of seismicity level and earthquake magnitude–frequency distribution characteristics. The analysis was conducted using the Maximum Likelihood method implemented in ZMAP. The earthquake data were obtained from BMKG and IRIS, covering the period from January 2004 to August 2024. The results indicate that East Java exhibits a high level of seismicity, with a value of 6.17 and a b-value of 0.757. Areas with relatively high earthquake activity potential were identified in Blitar, Tulungagung, and Trenggalek Regencies. The average seismicity index of East Java is 6.002, with a relatively short earthquake recurrence interval. These findings indicate a high potential for earthquake occurrence in East Java and may serve as a preliminary basis for sustainable earthquake disaster mitigation planning.
Mikrozonasi Kerentanan Seismik Berbasis Metode HVSR di Kapanewon Prambanan, Kabupaten Sleman : Seismic Vulnerability Microzonation Based on the HVSR Method in Kapanewon Prambanan, Sleman Regency Dwiantoro, Riski; Irayani, Zaroh; Sunardi, Bambang
Jurnal Stasiun Geofisika Sleman Vol. 3 No. 2 (2025): Jurnal Stasiun Geofisika Sleman (JSGS) - Desember 2025
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

Kapanewon Prambanan, Sleman Regency, is situated within the Yogyakarta Basin, characterized by complex geological conditions and thick sedimentary layers that can significantly amplify seismic ground motion. During the 2006 Yogyakarta Earthquake, this area experienced severe damage with an intensity reaching VII on the Modified Mercalli Intensity (MMI) scale. Therefore, seismic vulnerability microzonation is crucial in supporting effective earthquake mitigation strategies. This study aims to map the seismic vulnerability index in Kapanewon Prambanan using the Horizontal-to-Vertical Spectral Ratio (HVSR) method based on microtremor measurements. The HVSR method was applied to obtain the dominant frequency, amplification factor, and seismic vulnerability index. Furthermore, inversion of the H/V curves was performed to estimate the shear-wave velocity profile, particularly the Vs30 parameter. The results indicate that the dominant frequencies range from 0.98 to 17.13 Hz, amplification factors range from 1.06 to 11.69, Vs30 values range from 114 to 726 m/s, and seismic vulnerability index values range from 0.18 to 7.46. Areas with low seismic vulnerability are generally associated with the Semilir and Kebobutak Formations, while moderate to high vulnerability zones are predominantly distributed within the deposits of the Young Merapi Formation. The resulting seismic microzonation map is expected to serve as a valuable reference for spatial planning, infrastructure development, and earthquake risk mitigation in the Prambanan area.

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