Morphotectonic study of a watershed controlled by active fault in Southern Garut, West Java, Indonesia
Keywords:
Active fault, Cilaki watershed, Morphotectonic, Remote sensingAbstract
This research aimed to analyze geomorphological shapes of the Cilaki watershed in Southern West Java in relation to geological structures using a geomorphological approach. The Cilaki watershed is characterized by wide valley shapes in the mid to upstream areas and narrow valley shapes in the downstream area, which shape is like a wine glass. The Cilaki watershed is dominated by Quaternary volcanic deposits, while in the downstream area Tertiary sedimentary rocks are exposed. The Cilaki watershed appears to be controlled by active fault, but it isn't known how its stage of activities. The morphotectonic analysis focuses on the influences of geological structures on the shape of the watershed using remote sensing method. The tectonic frame is determined by tectonical analysis base on Southern West Java tectonic setting. We divide the morphotectonic study of the Cilaki watershed into three parts: 1) the quantitative characteristics of the geomorphology; 2) morphometrical analysis; and 3) characteristics of the geological structures. The shape and boundaries of the Cilaki watershed are determined by their structural influences. The lithology of the Cilaki watershed is controlled by resent tectonic activities with class 1, because both the Quaternary volcanics and the Tertiary sedimentary rocks are systematically cut off by faults. The morphotectonic analysis offers a method that may support other studies concerned with neotectonics.
References
Alzwar, M., Akbar, N., Bachri, S., 1992. Geology Map Sheet of Garut and Pameungpeuk, Java, Scale 1: 100.000 Second Edition. Geological Survey Centre, Geological Agency, Bandung, West Java, Indonesia.
Bull., William, B., 2007. A New Approach to Paleoseismology. Tectonic Geomorphology of Mountains, Blackwell Publishing Ltd.
Burbank, D. W., Anderson, R. S., 2009.Tectonic Geomorphology. Blackwell Publishing Ltd.
Darman, H., Side, H., 2000. An outline of the geology of Indonesia. Indonesian Association of geologist, Jakarta.
Dehbozorgi, M., 2010. Quantitative analysis of relative tectonic activity in Sarvestan area, central Zagros, Iran. Geomorphology, Elsevier.
Doornkamp, J. C., 1986. Geomorphological approaches to the study of neotectonics. Journal of Geological Society, 143, 335-342.
Hilmi, F., Haryanto, I., 2008. Geological Structure Pattern of Regional West Java, Scientific Contribution, Universitas Padjadjaran, Bandung, 6 (1)1, 88-95.
Keller., Edward, A., Pinter., Nicholas., 1996. Active tectonics: Earthquakes, uplift, and landscape. New Jersey, Prentice Hall, USA.
Koesmono, K., Kusnama., Suwarna, N., 1996. Geology Map Sheet of Sindangbarang a n d B a n d a r waru. Scale 1:100.000, Second Edition. Pusat Pengembangan dan Penataran Guru, Bandung.
Permana, H., Gaffar, E. Z., Sudarsono., Nurohman, H., Indarto, S., 2015. Structures and tectonic of the southern flank “ancient caldera of garut-bandung” south Garut West Java. Proceedings of Research Center for Geotechnology, Bandung, 978-979.
Prucha, J. J., 1964. Moody and Hill system of wrench fault tectonics: Discussion. Bulletin of the America Association of Petroleum Geologist, 48 (1), 106-124.
Simandjuntak, T. O., 2015. Tectonic. The 4th Edition (In Indonesia) Secretariat of Geological Agency. Bandung, Indonesia. Sukiyah, E., Syafri, I., Winarto, J. B., Susilo, M. R. B., Saputra, A., Nurfadli, E., 2016. Active faults and their implications for regional development at the southern part of West Java, Indonesia. Federation Internationale des Geometres Working Week 2016 in Christchurch, New Zealand, Proceedings, 1-12.
Van Bemmelen, R. W., 1949. The geology of Indonesia and adjacent Archipelagos, general wsxGeology. Martinus Nijhoff, The Hague, 1A, 25-28.
Verstappen, H. T., 2010, Indonesian Landform and Plate Tectonics. Journal Geology Indonesia, 5 (3), 197-207.
Van Zuidam., 1985. Aerial photo-interpretation in terrain analysis and geomorphologic mapping, International Institute for Aerospace Survey and Earth Sciences, Smits Publishers, Enschede.
