Geological Identification of Seismic Source at Opak Fault Based on Stratigraphic Sections of the Southern Mountains

Hita Pandita, Sukartono Sukartono, Agustinus Isjudarto

DOI: https://doi.org/10.23917/forgeo.v30i1.1508

Abstract

Earthquake is one of the unpredicted natural disasters on our earth. Despite of the absence of high-accuracy method to precisely predict the occurrence of earthquake, numerous studies have been carried out by seismologists to find it. One of the efforts to address the vulnerability of a region to earthquakes is by recognizing the type of rock as the source of the earthquake. Opak Fault is an active fault which was thought to be the source of earthquakes in Yogyakarta and adjacent areas. This study aimed to determine the seismic source types of rocks in Yogyakarta and adjacent areas. The methods were by measuring stratigraphic sections and the layer thickness in the western part of Southern Mountains. Field study was done in 6 (six) research sites. Results of stratigraphic measurement indicated the sedimentary rocks in the Southern Mountains was 3.823 km in thick, while the bedrock was more than 1.042 km in thick. Based on the result, the rock types as the seismic source were thought to originate from the continental crust rocks formed of granite and metamorphic complex.

Keywords

Stratigraphy; Earthquake; Southern Mountain

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References

Atmadja, R. S., Maury, R.C., Bellon, H., Pringgopawiro, H., Polve, M., dan Priadi, B., 1994. Tertiary magmatic belts in Java. Journal of SE Asian Earth Sciences, 9, h.13-27.

Matsushima, S, 1961, On The Strength Distribution of The Earth’s Crust and The Upper Mantle, and The Distribution of The Great Earthquakes With Depth, Disaster Prevention research Institute Bulletin, No. 43, Kyoto University, Japan.

Newcomb K. R. dan McCann, W. R., 1987: “Seismic History and Seismotectonics of the Sunda Arc”, Journal of Geophysical Research, Vol. 92, No. B1, pp 421-439. American Geophysical Union.

Pandita, H. dan Sukartono, 2014, Kali Ngalang Exposed Geohistory of Southern Mountain, Proc. International Symposium of Geoheritage, UPN Yogyakarta.

Pandita, H., Isnawan, D., dan Winarti, 2012, Mikrozonasi Tingkat Resiko Bancana di Wilayah Yogyakarta Berdasarkan Kajian Proses Geologi Masa Lampau Dan Sekarang, Laporan Penelitian Hibah Bersaing Tahun I, Sekolah Tinggi Teknologi Nasional, Yogyakarta

Pandita, H., Isnawan, D., dan Winarti, 2013, Mikrozonasi Tingkat Resiko Bancana di Wilayah Yogyakarta Berdasarkan Kajian Proses Geologi Masa Lampau Dan Sekarang, Laporan Penelitian Hibah Bersaing Tahun II, Sekolah Tinggi Teknologi Nasional, Yogyakarta

Prasetyadi, C., 2007, Evolusi Tektonik Paleogen Jawa Bagian Timur, Disertasi Doktor, Tidak dipublikasikan, ITB

Rahardjo, W., Sukandarrumidi, dan Rosidi, H.M.D., 1995, Peta Geologi Lembar Yogyakarta, Jawa, Pusat Penelitian dan Pengembangan Geologi, Bandung.

Rahardjo, W., Sukandarrumidi, dan Rosidi, H.M.D., 1995, Peta Geologi Lembar Yogyakarta, Jawa, Pusat Penelitian dan Pengembangan Geologi, Bandung.

Surono, 2008, Litostratigrafi dan Sedimentasi Formasi Kebo dan Formasi Butak di Pegunungan Baturagung, Jawa Tengah Bagian Selatan, Jurnal Geologi Indonesia, Vol. 3 No. 4 Desember 2008: 183-193, Puslitbang Geologi

Surono, Toha, B., dan Sudarno, I., 1992, Peta Geologi Lembar Surakarta Giritontro, Jawa, Pusat Penelitian dan Pengembangan Geologi, Bandung.

Thant, M., Kawase, H., Pramumijoyo, S., Hendrayana, H., dan Adi, A. D., 2008, Focal Mechnisms of Subduction Zone Earthquakes Along The Java Trench: Preliminary Study For The PSHA For Yogyakarta Region, Indonesia, The 14th World Conference on Earthquake Engineering October 12-17, 2008, Beijing, China.

Utsu, T. 2002, A List of Deadly Earthquakes in the World 1500-2000, International Handbook of Earthquake & Engineering Seismology, Part A, Academic Press, An Imprint of Elsevier Science, London

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