The Adjustment of Peak Ground Acceleration Value Based on Modification of Attenuation Constant with Accelerograph Data from 2020-2023 in Bali Region
Abstract
This study aims to determine the empirical formula model of maximum ground acceleration (PGA) in the Bali region by modifying the attenuation constant based on accelerograph data from 2020-2023 obtained from the BMKG Class II Sanglah Geophysical Station. The data used consists of 443 accelerograph recordings from 146 earthquake events, with a coverage area of ??113.51 ° - 115.83 ° E and 12.56 ° - 7.71 ° S. Through linear regression analysis, the empirical PGA model for the Bali region is obtained: log10 PGA = (-1.817) log10 (R) + (0.809) M - 0.089. This model is also compared with the attenuation model from Donovan, Setiawan, and Lin and Wu, with the results showing that the developed model has a very strong correlation of 0.782 between the PGA from observations and the PGA from the model which is included in the very strong category. In addition, the MSE value of 0.209 and RMSE of 0.457 from this model indicate that the model has a good level of accuracy in predicting PGA values. These findings provide a significant contribution in improving seismic risk prediction in the Bali region, which can be used as a basis for more effective disaster mitigation planning.
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References
[2] BMKG, “Sejarah Kegempaan Bali.” Accessed: Mar. 25, 2024. [Online]. Available: https://bbmkg3.bmkg.go.id/sejarah-gempa-merusak
[3] A. P. R, M. S. Purwanto, and A. Widodo, “Identifikasi Percepatan Tanah Maksimum (PGA) dan Kerentanan Tanah Menggunakan Metode Mikrotremor Jalur Sesar Kendeng,” J. Geosaintek, vol. 3, no. 2, p. 107, 2017, doi: 10.12962/j25023659.v3i2.2966.
[4] E. Ulfiana, S. A. Rumy, R. Pratama, and P. Ariyanto, “Analisis Pendekatan Empiris Pga (Peak Ground Acceleration) Pulau Bali Menggunakan Metode Donovan, Mc. Guirre, Dan M.V. Mickey,” J. Ilmu dan Inov. Fis., vol. 2, no. 2, pp. 155–161, 2018, doi: 10.24198/jiif.v2i2.19730.
[5] D. K. Priyanto, K. N. Suarbawa, and A. Septiadhi, “Penentuan Model Formula Empiris Percepatan Getaran Tanah Daerah Denpasar,” Bul. Fis., vol. 19, no. 1, pp. 23–27, 2018.
[6] I. P. A. P. Wiguna and I. M. Yuliara, “Penentuan Persamaan Empiris Percepatan Tanah Di Wilayah Bali Berdasarkan Data Gempabumi Periode 2008-2016,” Kappa J., vol. 3, no. 2, pp. 71–73, 2019.
[7] L. Ambarwati, “Pemetaan dan Analisa PGA Maksimum Gempabumi Pada Provinsi Aceh Periode 2012 - 2017 dengan Metode Atenuasi,” pp. 1–47, 2020.
[8] D. Kiswiranti, SEISMOLOGI (Dasar-dasar Seismologi dan Apilikasinya). Yogyakarta, 2019. [Online]. Available: http://eprints.akprind.ac.id/306/1/SEISMOLOGI.pdf
[9] A. Sungkowo, “Perhitungan Nilai Percepatan Tanah Maksimum Berdasar Rekaman Sinyal Accelerograph di Stasiun Pengukuran UNSO Surakarta,” Indones. J. Appl. Phys., vol. 8, no. 1, p. 43, 2018, doi: 10.13057/ijap.v8i1.14326.
[10] A. Rubaiyn, J. Safani, and K. Anwar, “Analisis Tingkat Seismisitas dan Percepatan Tanah Maksimum (PGA) Wilayah Sulawesi Tenggara Berdasarkan Data Gempabumi Periode 1973-2022,” J. Rekayasa Geofis. Indones., vol. 5, no. 02, pp. 70–81, 2023, doi: 10.56099/jrgi.v5i02.17.
[11] M. A. Sari, N. B. Wibowo, and D. Darmawan, “Pemetaan Percepatan Getaran Tanah Maksimum dan Intensitas Gempabumi di Kawasan Jalur Sesar Sungai Oyo Yogyakarta,” J. Ilmu Fis. dan Ter., vol. 6, no. 2, pp. 359–360, 2006, doi: https://doi.org/10.21831/fisika%20-%20s1.v6i2.5947.
[12] P. M. Meitawati et al., “Perbandingan Nilai Percepatan Tanah Maksimum Berdasarkan Modifikasi Konstanta Atenuasi dan Data Accelerograph Tahun 2008-2016 pada Stasiun BMKG Lampung,” J. Geofis. Eksplor., vol. 4, no. 2, pp. 201–215, 2017, doi: 10.23960/jge.v4i2.1.
[13] I. Rohman, D. Darmawan, D. Nugroho, and B. Wibowo, “Penentuan Formula Empiris Percepatan Tanah Maksimum Di Daerah Istimewa Yogyakarta,” J. Ilmu Fis. dan Ter., vol. 9, no. 1, pp. 26–27, 2022, doi: https://doi.org/10.21831/fisika%20-%20s1.v9i1.17974.
[14] I. Dharmawan, “Analisis Pendekatan Empiris Nilai PGA (Peak Ground Acceleration) dengan Persamaan Metode Donovan, MC. Guirre, dan Esteva di Kabupaten Kerinci,” Universitas Jambi, 2023.
