Determination of vp/vs on Bali Province: Case of Bali Earthquake March 22, 2017
Abstract
P-wave velocity and S-wave velocity have been investigated in the Bali Province by using earthquake case studies on March 22, 2017. The study was focused on finding out whether there were anomalies in the values of vp/vs before and after the earthquake. Earthquake data was obtained from the Meteorology, Climatology and Geophysics Agency (BMKG) Region III Denpasar, which consisted of the main earthquake on March 22, 2017 and earthquake data in August 2016 to May 2017. Data was processed using the wadati diagram method, obtained that the vp/vs on SRBI, IGBI, DNP and RTBI stations are shifted from 1.5062 to 1.8261. Before the earthquake occurred the anomaly of the value of vp/vs was found on the four stations, at the SRBI station at 10.35%, at the IGBI station at 16.16%, at DNP station at 12.27% and at RTBI station at 4.62%.
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References
[2] D. Pranata, Analisis Mekanisme Fokus Gempabumi Di Meulaboh (Nanggroe Aceh Darussalam) 9 Mei 2010, Universitas Islam Negeri Syarif Hidayatullah, Jakarta, 2010.
[3] Ibrahim, G. dan Subardjo, Pengetahuan Seismologi, Badan Meteorologi dan Geofisika, Jakarta, 2005.
[4] A. Satriyo, Penentuan Anomali Perubahan Kecepatan Gelombang Primer Dengan Kecepatan Gelombang Sekunder (vp/vs) Pada Daerah Papua Barat Studi Kasus Gempa Bumi Manokwari, Universitas Islam Negeri Syarif Hidayatullah, Jakarta, 2010.
[5] C. H. Scholz, L. R. Sykes dan Y. P. Aggarwal, Earthquake Prediction: A Physical Basis Science, vol. 181, 1973, pp. 803-810.
[6] Daryono, Identifikasi Sesar Naik Belakang Busur (Back Arc Thrust) Daerah Bali Berdasarkan Seismisitas dan Solusi Bidang Sesar, Badan Meteorologi Klimatologi dan Geofisika, Jakarta, 2011.
[7] M. Fahmi, Identifikasi Pola Tektonik Daerah Bali Dan Nusa Tenggara Berdasarkan Seismisitas Dan Komposit Mekanisme Sumber Gempabumi, Sekolah Tinggi Meteorologi Klimatologi dan Geofisika, Jakarta, 2014.
[8] D. Harmadhoni, Analisis Mekanisme Fokus Gempa Di Blitar-Jawa Timur 17 Mei 2011, Universitas Islam Negeri Syarif Hidayatullah, Jakarta, 2011.
[9] T. Ismawati, Mekanisme Fokus Gempa Bumi Mentawai, Universitas Islam Negeri Syarif Hidayatullah, Jakarta, 2011.
[10] R. McCaffrey dan J. Nabelek, Earthquakes, Gravity, and The Origin Of The Bali Basin: An Example Of A Nascent Continental Fold and Thrust Belt, Cambridge, Journal of Geophysical Research, vol. 92, no. B1, 1987, pp 441-460.
