ANALISIS PARAMETER a-VALUE DAN b-VALUE SEBAGAI MITIGASI BENCANA GEMPA BUMI DI NUSA TENGGARA TIMUR

Halimatul Aslamia, Zainul Arifin Imam Supardi

Abstract


Research on seismicity parameters in the East Nusa Tenggara region can use the a-value and b-value parameters as the main earthquake precursors. The two parameters are seismic activity level and relief level. In general, both parameters use the relationship between between the frequency of earthquake occurrences and magnitude earthquake from the Guternberg-Ritcher law in the form of a graph. This study uses secondary data from the USGS earthquake details which was processed with ZMAP 6.0 software with the maximum likelihood method. Statistics of earthquakes with a magnitude of 4,5 ≤ Mw ≤ 7,9 as many as 1685 events and a depth of 675.5 km in the period 1990-2020. Based on data analysis, the Gutenberg-Ritcher equation is log N (M)=8.72-1.19M where b-value = 1.19, a-value = 8.72, a-value (annual) = 7.23, fractal dimension = 2.38. From this reason, seismic activity in the East Nusa Tenggara region is relatively high, stress levels are low and the source of the earthquake is the main faults cause structural earthquakes and even tsunamis in the seismic tectonics of the arc area basin in front of the Australian plate subducting along the subduction zone in the northern Indonesia. Therefore, the seismic parameters can be used as a long-term earthquake disaster mitigation through knowledge such as socialization before a disaster, during a disaster, and after a disaster by considering the local wisdom of the local community.

Keywords


Parameter a-value; b-value; Guternberg-Ritcher law; precursor; seismotectonic

References


Ardiansyah, S. (2014). Model Prakiraan Kejadian Gempabumi Di Daerah Bengkulu. Jurnal Meteorologi Dan Geofisika, 15(2), 137-146. https://doi.org/10.31172/jmg.v15i2.183

Beckers, J., & Lay, T. (1995). Very broadband seismic analysis of the 1992 Flores, Indonesia, earthquake (Mw = 7.9). Journal of Geophysical Research: Solid Earth, 100(B9), 18179-18193. https://doi.org/https://doi.org/10.1029/95JB01689

Bidang, A. W. (2020). Pengaruh Penambahan Stasiun-Stasiun Seismik (STPI, TSPI, Dan IWPI) Terhadap Analisa Penentuan Parameter Gempa Bumi Studi Kasus Gempa Bumi Di Wilayah Papua Barat Tahun 2019 - 2020. Biolearing Journal, 7(2), 10-13.

BMKG. (2017). Gempa Bumi. http://balai3.denpasar.bmkg.go.id/tentang-gempa

Conterminous U.S. (n.d.). Search Earthquake Catalog. https://earthquake.usgs.gov/earthquakes/search/

Godano, C., Lippiello, E., & de Arcangelis, L. (2014). Variability of the b value in the Gutenberg-Richter distribution. Geophysical Journal International, 199(3), 1765-1771. https://doi.org/10.1093/gji/ggu359

Godano, C., Lippiello, E., & De Arcangelis, L. (2014). Variability of the b value in the Gutenberg-Richter distribution. Geophysical Journal International, 199(3), 1765-1771. https://doi.org/10.1093/gji/ggu359

Harimei, B., Massinai, M. A., & -, M. (2017). Analisis Seismisitas Pada Daerah Sulawesi Utara. Jurnal Geocelebes, 1(2), 53. https://doi.org/10.20956/geocelebes.v1i2.2292

KadirioÄŸlu, F. T., & Kartal, R. F. (2016). The new empirical magnitude conversion relations using an improved earthquake catalogue for Turkey and its near vicinity (1900-2012). Turkish Journal of Earth Sciences, 25(4), 300-310. https://doi.org/10.3906/yer-1511-7

Kayal, J. R. (2008). Microearthquake Seismology and Seismotectonics of South Asia. Springer Netherlands. https://books.google.co.id/books?id=POLg0eGi3EAC

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. April, 16-31.

Madlazim, M. (2013). Kajian Awal Tentang b Value Gempa Bumi Di Sumatra. Jurnal Penelitian Fisika Dan Aplikasinya (JPFA), 3(1), 41. https://doi.org/10.26740/jpfa.v3n1.p41-46

Mignan, A., & Woessner, J. (2012). Theme IV - Understanding Seismicity Catalogs and their Problems Estimating the magnitude of completeness for earthquake catalogs. April. https://doi.org/10.5078/corssa-00180805.

Murtianto, H. (2016). Potensi Kerusakan Gempa Bumi Akibat Pergerakan Patahan Sumatera Di Sumatera Barat Dan Sekitarnya. Jurnal Geografi, 10(1). https://doi.org/10.17509/gea.v10i1.1667

Mutiarani, A., Madlazim, & Prastowo, T. (2013). Studi b-Value untuk Pengamatan Seismisitas Wilayah Pulau Jawa Periode 1964-2012. Jurnal Fisika, 02(02), 1-5.

Pasau, G., -, F., & Tamuntuan, G. H. (2017). Pengamatan Seismisitas Gempa Bumi Di Wilayah Pulau Sulawesi Menggunakan Perubahan Nilai a-b. Jurnal MIPA, 6(1), 31. https://doi.org/10.35799/jm.6.1.2017.15988

Popandopoulos G. A., & Chatziioannou E. (2014). Gutenberg-Richter Law Parameters Analysis Using the Hellenic Unified Seismic Network Data Through FastBee Technique. Earth Sciences, 3(5), 122. https://doi.org/10.11648/j.earth.20140305.12

Putri, yanuarsih T., Heryandoko, N., Wandono, Marrulak, R., Suwardi, Zulfikar, Yuniarto, B., Pary, L., & Kamaruddin, B. (2016). Relokasi Dan Distribusi B-Value Gempabumi Swarm Jailolo , Halmahera Barat Earthquake Relocation And Distribution oF b-Value Of The Jailolo. 17(3), 199-206.

Rahardiawan, R., & Purwanto, C. (2016). Struktur Geologi Laut Flores, Nusa Tenggara Timur. Jurnal Geologi Kelautan, 12(3), 153. https://doi.org/10.32693/jgk.12.3.2014.256

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. Jurnal Inovasi Fisika Indonesia (IFI), 10(1), 1-10.

Rohadi, S. (2015a). Distribusi Spasial Dan Temporal Parameter Seismotektonik Sebagai Indikasi Tingkat Aktivitas Kegempaan Di Wilayah Papua. Jurnal Meteorologi Dan Geofisika, 16(3), 189-198. https://doi.org/10.31172/jmg.v16i3.289

Sili, P. D., & Fauzi, A. (2013). Penentuan Seismisitas dan Tingkat Risiko Gempa Bumi. Universitas Brawijaya Press. https://books.google.co.id/books?id=WrxjDwAAQBAJ

Sippl, C., Schurr, B., Yuan, X., Mechie, J., Schneider, F. M., Gadoev, M., Orunbaev, S., Oimahmadov, I., Haberland, C., Abdybachaev, U., Minaev, V., Negmatullaev, S., & Radjabov, N. (2013). Geometry of the Pamir-Hindu Kush intermediate-depth earthquake zone from local seismic data. Journal of Geophysical Research: Solid Earth, 118(4), 1438-1457. https://doi.org/10.1002/jgrb.50128

Sokolov, V., Zahran, H. M., Youssef, S. E. H., El-Hadidy, M., & Alraddadi, W. W. (2017). Probabilistic seismic hazard assessment for Saudi Arabia using spatially smoothed seismicity and analysis of hazard uncertainty. Bulletin of Earthquake Engineering, 15(7), 2695-2735. https://doi.org/10.1007/s10518-016-0075-5

Srivastava, K., Rani, V., & Srinagesh, D. (2014). A review of b-value imaging and fractal dimension studies in the Andaman Sumatra subduction. Natural Hazards, 77. https://doi.org/10.1007/s11069-014-1143-2

Suharna, A., Palloan, P., & Arsyad, M. (2018). Analisa Fraktal Dan Rasio Slip Pulau Sumatera Berdasarkan Variasi Parameter Tektonik. 1-4.

Tang, B. Y. (2016). Pemetaan Nilai Koefisien Seismik Di Daerah Nusa Tenggara Timur. Jurnal Fisika, 1(2), 78-83.

Thene, J. (2016). Mitigasi Bencana Gempa Bumi Berbasis Kearifan Lokal Masyarakat Rote Kabupaten Rote Ndao Provinsi Nusa Tenggara Timur. 1(2), 102-106.

Tinker, M. A., Beck, S. L., Jiao, W., & Wallace, T. C. (1998). Mainshock and aftershock analysis of the June 17, 1996, deep Flores Sea earthquake sequence: Implications for the mechanism of deep earthquakes and the tectonics of the Banda Sea. Journal of Geophysical Research: Solid Earth, 103(B5), 9987-10001. https://doi.org/https://doi.org/10.1029/97JB03533

Utomo, D. P., & Purba, B. (2019). Penerapan Datamining pada Data Gempa Bumi Terhadap Potensi Tsunami di Indonesia. Prosiding Seminar Nasional Riset Information Science (SENARIS), 1(September), 846. https://doi.org/10.30645/senaris.v1i0.91

Wekke, I. S. (2021). Mitigasi Bencana. Penerbit Adab. https://books.google.co.id/books?id=l3Y-EAAAQBAJ

Widada, S. (2016). Analisis Dimensi Fraktal Kejadian Gempa Dl Laut Banda Indonesia. Jurnal Kelautan Tropis, 19(2), 108. https://doi.org/10.14710/jkt.v19i2.837




DOI: https://doi.org/10.34312/jpj.v4i1.13815

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