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Abstract
Sulawesi is one of Indonesia's large islands with a high vulnerability to earthquakes due to its geographical location, which lies between the confluence of tectonic plates and several active faults. The earthquake events' intensity was relatively high with small to large magnitudes. One area recently hit by a large earthquake that caused material losses and casualties was found in Mamuju. Given this condition, it is essential to determine the latest seismicity mitigation in the Mamuju area and its surroundings to look at the distribution of the mainshock based on the magnitude and depth of the earthquake. Earthquakes that occur in a particular area and for a certain period can describe the concentration of earthquake activity. The earthquake data activity used in this study is to find earthquake data for the period 1960-2021, followed by a declustering process which is carried out to separate the mainshock from the aftershocks. Separating the mainshock from the aftershocks is performed using the time window and distance windows criteria. Based on the analysis, it was found that the number of mainshocks that occurred in the Mamuju region was 20.11% of the total earthquake events that occurred (5366 earthquake event data) with a dominance of moderate to large magnitude (4<M<6). Meanwhile, based on the depth of the earthquake, 54.19% of the earthquake event were shallow earthquakes (0 km < D < 60 km). This can be used as a basis for updating existing earthquake maps and for paying attention to the application of earthquake-resistant building regulations and building construction permits in the Mamuju area, considering that the vulnerability to earthquakes in this area is relatively high.
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References
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- Choanji, T., Yuskar, Y., dan Cahyaningsih, C. (2019). Kajian Pemetaan Struktur dan Potensi Longsor Berdasarkan Digital Elevation Model dan Unmanned Aerial Vehicle (UAV), Daerah Pangkalan, Sumatera Barat. Jurnal Geografi, Vol 11 No.2, 163-170.
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- Teguh, M. dan Erlangga, W. (2019). “Comparison of Bedrock and Surface Time Histories Subjected to Subduction Earthquake in a Selected Location of Yogyakarta”, Journal of GEOMATE. 17. Issue 63. pp. 77 -86.
- Uhrhammer, R.A., Characteristics of Northern and Central California Seismicity, Earthquake Notes, Vol. 57, No. 1, pp. 21, 1986.
- Widodo. (2012). “Seismologi Teknik & Rekayasa Kegempaan”. Pustaka Pelajar. Yogyakarta
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References
Aldiamar, F., (2007). “Analisa Resiko Gempa dan Pembuatan Respon Spektra Desain untuk Jembatan Suramadu dengan Permodelan Sumber Gempa 3D”, Program Pascasarjana Fakultas Teknik Sipil dan Perencanaan, ITB, Bandung.
Asrurrifak, M. (2010). “Peta Respon Spektra Indonesia untuk Perencanaan Struktur Bangunan Tahan Gempa dengan Model Sumber Tiga Dimensi dalam Analisis Probabilistik”. Disertasi, Institut Teknologi Bandung, Bandung.
Bock, R. Genrich J. F., Y. McCaffrey, E. Calais, C.W. Stevens, and C. Subarya. (1996). “Accretion of the southern Banda arc to the Australian plate margin determined by Global Positioning System measurements”, Tectonics. 15. 288-295.
Choanji, T., Yuskar, Y., dan Cahyaningsih, C. (2019). Kajian Pemetaan Struktur dan Potensi Longsor Berdasarkan Digital Elevation Model dan Unmanned Aerial Vehicle (UAV), Daerah Pangkalan, Sumatera Barat. Jurnal Geografi, Vol 11 No.2, 163-170.
Erlangga, W. (2020). “Karakteristik dan Parameter Subduksi Sumber Gempa Pulau Jawa”. Teknisia, Vol 25, No. 2, 88-98.
Erlangga, W., Teguh, M., dan Makrub. L. (2020). “The analysis of performance level on an existing multi-story building structure using the time history based on the subduction earthquake source”. E3S Web of Conferences. Vol 156. 4th International Conference on Earthquake Engineering & Disaster Mitigation (ICEEDM 2019). Padang. Indonesia.
Gardner, J. K. and Knopoff, L., Is the Sequence of Earthquakes in Southern California, With Aftershocks Removed, Poissonian?, Bulletin of the Seismological Society of America, 64, 1,363–1,367, 1974.
Gutenberg, B. and Richter, C.F., (1944), “Frequency of Earthquakes in California”. Bulletin of the Seismological Society of America, 34, 185-188.
Hutapea, B. M., dan Mangape, I. (2009). Analisis Hazard Gempa dan Usulan Ground Motion pada Batuan Dasar untuk Kota Jakarta. Jurnal Teknik Sipil, 16(3), 121-132.
Irsyam, M., Sengara I.W., Adiamar, F., Widiyantoro, S., Triyoso, W., Natawidjaja, D.H., Kertapati, E., Meilano, I., Suhardjono, Asrurifak, M., dan Ridwan, M. (2010). “Ringkasan Hasil Studi Tim Revisi Peta Gempa Indonesia”, Bandung.
Lay, T. dan Wallace, T.C. (1995). “Modern Global Seismology”. Academic Press, San Diego, California.
Mahesworo, R. P. (2008). “Usulan Ground Motion Untuk Empat Kota Besar Di Wilayah Sumatera Berdasarkan Hasil Analisis Seismic Hazard Menggunakan Model Sumber Gempa 3 Dimensi”, Tesis, Institut Teknologi Bandung.
Makrup, L. (2009). “Pengembangan Peta Deagregasi Hazard untuk Indonesia Melalui Pembuatan Software dengan Pemodelan Sumber Gempa Tiga Dimensi”. Disertasi. Institut Teknologi Bandung. Indonesia
Milson, J., Masson D., Nichols G., Sikumbang N., Dwiyanto B., Parson L., Kallagher H. (1992). “The Manokwari Trough and The Western End of The New Guinea Trench,” Tectonics. 11. 145-153.
Mustafa, B. (2010). Analisis Gempa Nias Dan Gempa Sumatera Barat Dan Kesamaannya Yang Tidak Menimbulkan Tsunami. Jurnal Ilmu Fisika, Universitas Andalas, 2(1), 44-50.
Nicolaou.A.S. (1998). “A GIS Platform for Earthquake Risk Analysis”. Dissertation, Faculty of the Graduate School of State University of New York at Buffalo USA.
Purbandini, P., Santosa, B. J., dan Sunardi, B. 2017). Analisis Bahaya Kegempaan di Wilayah Malang Menggunakan Pendekatan Probabilistik. Jurnal Sains dan Seni ITS, 6(2), B20-B24.
Pusat Studi Gempa Nasional. (2017). Peta Sumber dan Bahaya Gempa Indonesia Tahun 2017. Pusat Penelitian dan Pengembangan Perumahan dan Permukiman, Badan Penelitian dan Pengembangan, Kementerian Pekerjaan Umum dan Perumahan Rakyat.
Saputro, I.T. dan Momot, H. (2020). Pemutakhiran Peta Sebaran Gempa Bumi Berdasarkan Magnituo dan Kedalam di Wilayah Provinsi Papua Barat pada 50 Tahun Terakhir, TAPAK Vol.10 No.1, 1-9.
SNI 1726-2019. (2019). “Tata Cara Perencanaan Ketahanan Gempa untuk Struktur Bangunan Gedung dan Non Gedung”. Badan Standarisasi Nasional (BSN). Jakarta.
Sulistyanto, Iwan Gatot. (2009), “Geografi 1: untuk Sekolah Menengah Atas/Madrasah Aliyah Kelas X”. Departemen Pendidikan Nasional. Jakarta.
Teguh, M. dan Erlangga, W. (2019). “Comparison of Bedrock and Surface Time Histories Subjected to Subduction Earthquake in a Selected Location of Yogyakarta”, Journal of GEOMATE. 17. Issue 63. pp. 77 -86.
Uhrhammer, R.A., Characteristics of Northern and Central California Seismicity, Earthquake Notes, Vol. 57, No. 1, pp. 21, 1986.
Widodo. (2012). “Seismologi Teknik & Rekayasa Kegempaan”. Pustaka Pelajar. Yogyakarta
Wiemer, S., A Software Package to Analyze Seismicity: ZMAP. Seismological Research Letters, Vol. 72, 373-382, 2001.