Opak Fault Strand Delineation Using Merapi Slope Shifted Indicator
Agus Sutiono(1*), Bambang Prastistho(2), C. Prasetyadi C. Prasetyadi(3), Supartoyo Supartoyo(4)
(1) Geological Engineering, University of Pembangunan Nasional “Veteran” Yogyakarta
(2) Geological Engineering, University of Pembangunan Nasional “Veteran” Yogyakarta
(3) Geological Engineering, University of Pembangunan Nasional “Veteran” Yogyakarta
(4) Center for Volcanology and Geological Hazard Mitigation, Geological Agency of Indonesia
(*) Corresponding Author
Abstract
Abstract
After the Yogya earthquake occurred on May 27, 2006, the opinions of experts split into two groups regarding location of responsible fault to earthquake shacking; (1), First group argues that Opak Fault displacement caused the earthquake. Where fault line is commonly known runs along Opak River, striking from Parangtritis Beach to Prambanan. (2) Second group of experts stated at deferent opinion, that another fault displacement triggered the earthquake shock. Where is located at the East side of the Opak River about 10 Km. On the other-hand, this paper proposes an idea to unravel Opak Fault position by understanding, that main active fault movement underlying Bantul region has been influencing continuum mechanical process, onto Merapi Sediments surface since the early periods of continuing Merapi materials sedimentation. It should has been reflected to the surface landform at above the fault strand. Further, indicates to morphotectonic feature as an en echelon slope shifted alignment. Thus, it can be the way to assist in defining attribute of main fault (PDZ) areas by using its en echelon indicator of shifting slope alignment. This paper also presents the results of determining Opak fault line location by using Digital Elevation Model (DEM-NAS) to generate custom shading in approaching landform features. With a further doing specific landscapes observations over the entire of Young Merapi deposits. There are other challenges to alternate identification of buried basin faults fill, by doing carefully identifications in morphotectonic aspects over the entire South Slope Merapi flank. It traces from Kepurun village at about elevation 400 m towards Parangtritis at 25 m of elevation. Independent field morphotectonic data sets of such scarp, terraces, water springs alignment and active cracks are encountered in the vicinity of Merapi sediments slope shifted, particularly in Tirtomartani Jetis village Kalasan. Identification of such structures obtained from morphotectonic analysis results are regarded as reliable indicator of faults, which is efficiently can be found in field.
Key word: Opak Fault, Morphotectonic, Slope Shifted, Delineation.
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Abidin, H. Z., Andreas, H., Meilano, I., Gamal, M., Gumilar, I., & Abdullah, C. I. (2009). Deformasi Koseismik dan Pasca Seismik Gempa Yogyakarta 2006 dari Hasil Survei GPS. Jurnal Geologi Indonesia, Vol. 4 No. 4 Desember 2009: 275-284.
Allmendinger, R. W. (1989). Notes on Fault Slip Analysis. Department of Geological Sciences Cornell University Ithaca, New York 14853-1504.
Choia, J. H., Edward, P., Kyoungtae, K. C., & Kima, Y. S. (2007). Definition and Classification of fault damage zones: A review and a new methodological approach. Earth-Science Reviews.
Laake, A. (2011). Integrate of Satellite Imagery Geology and Geophysical Data. Earth and Environmental Sciences, Dr. Imran Ahmed Dar (Ed.), ISBN 978-953-307-468-90.
Rahardjo, W., Sukendarrumidi, & Rosidi, H. M. D. (1995). Peta Geologi Yogyakarta. Pusat Penelitian dan Pengembangan Geologi, Bandung.
Schueller, S. A, Braathen, A., Haakon Fossen, H., & Tveranger, J., (2013), Spatial distribution of deformation bands in damage zones of extensional faults in porous sandstones: Statistical analysis of field data. A Centre for Integrated Petroleum Research (CIPR), Uni Research, P.O. Box 7810, 5020 Bergen, Norway.
Supartoyo, Hidayati, S., & Subandriyo (2016). Opak Fault Inferred From Morphotectonic Analysis (preliminary Result). Proceedings Jogja Earth quake in Reflection 2016.
Sutiono, A., Prastistho, B., Prasetyadi, C., & Supartoyo (2018). Opak fault: A comparative review CEMINE IOP Conf. Series: Earth and Environ- mental Science 012049 IOP Publishing.
Tsuji, T., Yamamoto, K., Matsuoka, T., Yamada, Y., Onishi, K., Bahar, K., Meilano, I., & Abidin, H.Z. (2009). Earthquake fault of May 26, 2006, Yogyakarta earthquake observed by SAR interferometry. Online published August 7, 2009, Graduate School of Engineering, Kyoto University, Kyoto, Japan Institute of Technology Bandung (ITB), Jl. Ganesha 10, Bandung 40132, Indonesia.
Watkinson, I. M., & Hall, R. (2017). Fault systems of the eastern Indonesian triple junction: evaluation of Quaternary activity and implications for seismic hazards. SE Asia Research Group, Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK on May 1, 2017. URL: http://sp.lyellcollection.org/.
Widijono, B. S., & Setyanta, B. (2007). Anomali Gaya Berat, Kegempaan Serta Kelurusan Geologi Daerah Yoyakarta dan Sekitarnya. Pusat Survey Geologi JSDG vol XVI.
DOI: https://doi.org/10.22146/jag.55276
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