Keywords
deformation
GPS campaign
horizontal displacement
subduction
How to Cite
Abstract
DOI: 10.17014/ijog.5.1.81-91Seven periods of GPS campaign have been conducted for three years since March 2013 - October 2015 on fourteen GPS sites across Bali Island. The GAMIT/GLOBK 10.6 version was used to compute data with respect for thirteen reference sites of International Terrestrial Reference Frame (ITRF) 2008 surrounding Bali. The result shows that horizontal displacement varies between 1.93 and 22.53 mm/yr dominantly northeastward. Vertical displacement ranges at -184.34 to 33.79 mm/yr. The result of modeling using Coulomb 3.3 version indicates the deformation in Bali was mostly contributed by subduction at the southern part, West and East Flores Back-Arc Thrust at the north, Lombok Strait Fault and a fault at the eastern coast of Bali with the estimation maximum magnitude of 7.1, 6.6, 6.8, 5.8, and 5.2, respectively.References
Badan Informasi Geospasial, 2015. Peta Rupa Bumi Indonesia, https://www.bakosurtanal.go.id/petarupabumi/
Bock, Y., Prawirodirdjo, L., Genrich, J.F., Stevens, C.W., and McCaffrey, R., 2003. Crustal Motion in Indonesia from Global Positioning System Measurements, Journal of Geophysical Research, 108 (B8). DOI: 10.1029/2001JB000324
McCaffrey, R. and Nabelek, J., 1987. Earthquakes, gravity, and the origin of the Bali Basin: An example of a Nascent Continental Fold and-Thrust Belt. Journal of Geophysical Research, 92 (B1) p.441-460. DOI: 10.1029/2001JB000324
Hamilton., W.B., 1979. Tectonic of Indonesia Region. U.S. Govt. Printing Office, 345pp.
Herring, T.A., King, R.W., Floyed, M.A., and McClusky, S.C., 2015. Introduction to Gamit/ Globk Release 10.6, Massachusetts Institute of Technology, Cambridge.
Irsyam, M., Sengara, W., Aldiamar, F., Widiyantoro, S., Triyoso, W., Hilman, D., Kertapati, E., Meilano, I., Suhardjono, Asrurifak, M., and Ridwan, M., 2010. Development of seismic Hazard Maps of Indonesia for Revision of Seismic Hazard map in SNI 03-1726 2002, Report of Team for Revision of Seismic Hazard Maps of Indonesia.
Kuncoro, H., 2013. Estimasi Parameter Rotasi Euler Blok Sunda Berdasarkan Data Pengamatan GPS Kontinyu dan Episodik di Regional Asia Tenggara, Tesis Magister ITB.
Koulali, A., Susilo, S., McClusky, S., Meilano, I., Cummins, P., Tregoning, P., and Lister, G., 2016. Crustal strain partitioning and the associated earthquake hazard in the eastern Sunda-Banda
Arc. Geophysical Research Letters, 43 (5), p.1943-1949. DOI:10.1002/2016GL067941
Pusat Studi Gempa Nasional (Pusgen), 2017. Peta Sumber dan Bahaya Gempa Indonesia 2017. Pusat Litbang Perumahan dan Pemukiman, Kemen PUPR.
Silver, E., Donald, R., and Robert, M., 1983. Back Arc Thrusting in the Eastern Sunda Arc, Journal of Geophysical Research, 88 (B.09), p.7429-7448. DOI: 10.1029/JB088iB09p07429
Soehaimi, A., 2015. Seismotectonic and Active Fault Study of Eastern Coast Bali Island, Indonesia. Unpublished paper.
Sulaeman, C., 2011. Bencana Geologi di Indonesia Tahun 2011. Buletin Vulkanologi dan Bencana Geologi, 6 (2). Badan Geologi. Bandung.
Supartoyo, Surono, and Putranto, E.K., 2015. Katalog Gempabumi Merusak di Indonesia Tahun 1612 - 2014. Pusat Vulkanologi dan Mitigasi Bencana Geologi, Badan Geologi.
Toda, S., Stein, R.S., Sevilgen,V., and Lin J., 2011. Coulomb 3.3, Graphic_Rich Deformation and Stress-Change Software for Earthquake, Tectonic, and Volcano Research and Teaching, Earthquake Science Center, Menlo Park Science Center, U.S. Geological Survey, https://earthquake.usgs.gov/.
Tregoning, P., Brunner, F.K., Bock, Y., Puntodewo, S.S.O., McCaffrey, R., Genrich, J.F., Calais, E., Rais J., and Subarya, C., 1994. First Geodetic Measurement of Convergence Across the Java Trench, Geophysical Research Letters, 21 (19), p.2135-2138. DOI: 10.1029/94GL01856