Analisis Parameter Seismisitas a-Value dan b-Value serta Percepatan Tanah Maksimum (PGA) Sebelum dan Sesudah Gempa Ambon 2019 Menggunakan Metode Probabilistic Seismic Hazard Analysis (PSHA)
DOI:
https://doi.org/10.25077/jfu.13.6.813-819.2024Keywords:
a-value, b-value, PGA, PSHAAbstract
Probabilistic Seismic Hazard Analysis (PSHA) is a method to estimate earthquake risk in a region by considering uncertainties in earthquake sources and local ground response. To estimate earthquake risk and seismic impacts in a region, an in-depth analysis of seismicity parameters, such as a-value and b-value, as well as maximum ground acceleration (PGA), is required. This study aims to analyze changes in seismicity parameters, particularly b-value (rock fragility) and a-value (seismicity index) in the Maluku region before and after the 2019 Ambon earthquake. This study also aims to see whether there are changes in Peak Ground Acceleration (PGA) values for the Maluku region after the 2019 Ambon Earthquake. The seismic data used in this study comes from the USGS catalogue recorded from 2000 to 2022. The results of this study show that the b-Value of the Maluku region as a whole before the earthquake was 1.15 and decreased to 0.91 after the 2019 Ambon earthquake. However, the a-Value and b-Value for each seismic source zone increased. In addition, the PGA value for the Maluku region is 1.25g. These results provide the conclusion that the Maluku region is included in the zone with medium seismic hazard with the level of earthquake damage included in category VI of the MMI scale.
References
Alabi, A. A., Akinyemi, O. D., & Adewale, A. (2012). Seismicity Pattern in Southern Africa from 1986 to 2009. Earth Science Research, 2(2). https://doi.org/10.5539/esr.v2n2p1
BMKG. (2019). Ulasan Guncangan Tanah Akibat Gempabumi di Ambon Maluku 26 September 2019. BMKG. https://www.bmkg.go.id/seismologi-teknik/ulasan-guncangan-tanah.bmkg?p=ulasan-guncangan-tanah-akibat-gempabumi-di-ambon-maluku-26-september-2019&tag=ulasan-guncangan-tanah&lang=ID
Bommer, J. J. (2022). Earthquake hazard and risk analysis for natural and induced seismicity : towards objective assessments in the face of uncertainty. In Bulletin of Earthquake Engineering (Vol. 20, Nomor 6). Springer Netherlands. https://doi.org/10.1007/s10518-022-01357-4
Fadilah, M. I., & Ronoatmojo, S. (2022). Analisis Tingkat Aktivitas Seismik Dan Kerapuhan Batuan Di Dataran Papua Dan Sekitarnya Pada Kedalaman 0-60 Km Analysis of Seismic Activity and Rock Friability Level in the Papua Land and Surroundings At a Depth of 0-60 Km. Journal Of Geoscience Engineering & Energy (JOGEE), III, 100–108. https://trijurnal.lemlit.trisakti.ac.id/jogee
Ghassabian, N. N., Khatib, M. M., Nazari, H., & Heyhat, M. R. (2018). Regional variations and earthquake frequency–magnitude distribution and fractal dimension in the North of Central-East Iran Blocks (NCEIB). Arabian Journal of Geosciences, 11(11). https://doi.org/10.1007/s12517-018-3506-6
Gutenberg, B., & Richter, C. F. (1944). Frequency of earthquakes in California*. Bulletin of the Seismological Society of America, 34(4). https://doi.org/10.1785/bssa0340040185
Irsyam, M., Cummins, P. R., Asrurifak, M., Lutfi, F., Natawidjaja Hilman, D., Widiyantoro, S., Meilano, I., Triyoso, W., Rudiyanto, A., Hidayati, S., Ridwan, M., Hanifa, N. R., & Syahbana, A. J. (2020). Development of the 2017 national seismic hazard maps of Indonesia. 10. https://doi.org/10.1177/8755293020951206
Leviana, M., Syafriani, & Sabarani, A. Z. (2017). Estimasi Nilai Percepatan Tanah Maksimum Wilayah Sumatera Barat Berdasarkan Skenario Gempabumi M8.8 SR Menggunakan Rumusan Empiris Mc. Guire (1963) dan Donovan (1973). Pillar of Physics, 10(1963), 55–62.
Linda, Ihsan, N., & Palloan, P. (2019). Analisis Distribusi Spasial Dan Temporal Seismotektonik Berdasarkan Nilai b-Value Dengan Analysis Of Spatial And Temporal Distribution Of Seismotectonics Based On b-Value Using The Likelihood Method On Java Pendahuluan Gempa Bumi Sering Melanda Indonesia. Jurnal Sains dan Pendidikan Fisika, April, 16–31.
Madlazim, M. (2013). Kajian Awal Tentang b Value Gempa Bumi di Sumatera. Jurnal Penelitian Fisika dan Aplikasinya (JPFA), 3(1). https://doi.org/10.26740/jpfa.v3n1.p41-46
Risanti, H., & Prastowo, T. (2021). Estimasi Parameter a-Value dan b-Value Untuk Analisis Studi Seismisitas dan Potensi Bahaya Bencana Gempa Tektonik di Wilayah Maluku Utara. Inovasi Fisika Indonesia, 10(1), 1–10. https://doi.org/10.26740/ifi.v10n1.p1-10
Setiawan, Y., Fathani, T. F., & Faris, F. (2023). Seismic Hazard Assessment in Maluku Province Using PSHA. INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur, 19(2), 223–232. https://doi.org/10.21831/inersia.v19i2.66790
Shepp, L. A., & Vardi, Y. (1982). Maximum Likelihood Reconstruction for Emission Tomography. IEEE Transactions on Medical Imaging, 1(2). https://doi.org/10.1109/TMI.1982.4307558
Sianipar, D., Halauwet, Y., Daryono, & Karnawati3, D. (2019). Studi Sumber Gempa Ambon 26 September 2019 Mw 6,5. Preprints, September, 1–20. https://osf.io/preprints/inarxiv/6e9nm/
Simamora, J. T., & Namigo, E. L. (2016). Pemetaan Magnitude of Completeness ( M c ) untuk Gempa Sumatera. 5(2), 179–186.
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