Keywords
degree of tectonic intensity
neotectonic activity
river basin
bifurcation ratio
drainage density
How to Cite
Abstract
Indications exhibiting active tectonic movements in Java occur in many places, characterized by unstable regions, such as active faults, earthquakes, volcanic eruptions, etc. The results of researches conducted at several areas in West and Central Java on tectonic morphometry developments of river basins both in Quaternary deposits and Tertiary sediments exhibit a degree of active tectonic intensity. Such the researches are very important regarding to the spatial development design that is related to a region of active tectonism that should be well understood by planners for decision making mainly through comprehensive approach, in which the phenomena involved explaining the characteristics of the region as part of an active plate margin. Statistic approach as the chosen methodology had been utilized to gain meaningful conclusions through the verification of hypotheses, which are based on valid and reliable tested data obtained from the fields and satellite imagery. Results of regression-correlation tests between azimuths of river segment and lineaments in both chronostratigraphic systems mentioned earlier are significant with several large values of correlation coefficients r of no less than 0.9. On the other hand, results of t-tests are not a significant difference of means of bifurcation ratio (Rb) and drainage density (Dd) from many to river basins. The results of all tests have verified the effect of active tectonic control on the morphometry development process regarding to river segments and density of drainage patterns development in Tertiary and Quaternary deposits.
References
Bates, L.B. and Jackson, J.A., 1984. Dictionary of geological terms. The American Geological Institute, Anchor Book Doubleday, New York, 571 pp.
Budiadi, 2008. Role of tectonism in the development of Kulon Progo mountainous region, Yogyakarta, PhD Thesis, Padjadjaran University, unpublished.
Burbank, D.W. and Anderson, R.S., 2001. Tectonic geomorphology, Massachusetts, Blackwell Science.
Djuri, M., Samodra, H., Amin, T.C., and Gafoer, S, 1996. Geological Map of Purwokerto and Tegal Sheet, Java, scale 1:100.000. Geological Research and Development Centre, Bandung.
Doornkamp, J.E., 1986. Geomorphological approach to the study of neotectonics. Journal of Geological Society. London, (143), p.335-342.
Haig, Brian, D., 1995. Grounded Theory as Scientific Method, Philosophy of`Education. University of Canterbury. Retrieved August 8, 2006, from https://www.ed.uiuc.edu/EPS/PESYearbook/ 95 docs/haig.html
Hirnawan, F., 1987. The effect of reverse fault on patterns of strike and dip of bedding planes and joints in Halang Formation, Bantarujeg, Regency of Kuningan, West Java. Riset, Geologi dan Pertambangan, Puslit Geoteknologi, p. 31-40.
Hirnawan, F., 1997. Morphometry characteristics of drainage system in the region of active tectonic effects – Case Study of Cijolang and Cimuntur Drainage System) : Analisis Sistem. BPPT (Technology Evaluation and Application Board), Kedeputian Bidang Analisis Sistem, IV (9), p. 67-77.
Hirnawan, F., Sudarsono, U., and Soehaimi, A., 1998. Tracing landslide hazards zonation of slope stability dynamic system and the stabilization by optimizing the integrated role of vegetation and slope-geometry, State Ministry Office of Research and Technology, National Research Council, Multy Years Research Report of 1995-1998 Riset Unggulan Terpadu Program (Integrated Research Program), Field of Environment Protection - Technology, 141 pp.
Hirnawan, F. and Muslim, D., 2006. Drainage morphometry characterizing active tectonism in West Java. Proceedings of 2006 Map Asia International Conference Agustus-September 2006, Bangkok, Thailand, 18 pp.
Hirnawan, F., Agus Nur, A., and Sophian, I., 2007. Response of Quaternary morphometry to active tectonism as area constraint for spatial and infrastructure development program, Bumiayu, Central Java, Research Institute, Padjadjaran University.
Jun Xu, 2007. Watershed Hydrology. https://hydrology.lsu.edu/,10/23/2007.
Kastowo and Suwarna, N., 1996. Geological Map of Majenang Sheet, Java, scale 1:100.000, Geological Research and Development Centre, Bandung.
Keller, E.A., and Pinter, N., 1999. Active tectonism. New York, Prentice Hall Inc., 337 pp.
Linsley, R.K., Kohler, M.A., and Paulhus, J.L.H., 1975. Applied Hydrology. MacGraw Hill Pub. Co. Ltd., New Delhi.
McNeil, L., 1999. Illustrated Dictionary of Earth Science. The American Geological Institute, Tasa Graphic Arts, Inc.
Nakata, T., Odaka, J., Goto, H., Asahi, K., Chida, N., Suzuki, Y., Watanabe, K., and Nakamura, T., 1996. A trench study on the surface fault rupture in Awaji Island associated with the 1995 Hyokogen - nambu earthquake. Journal Active Fault Research, (14), p. 23-27.
Senadeera, K.P.G.W., Piyasiri, S., and Nandalal, K.D.W., 2007. The evaluation of Morphometric Characteristics of Kotmale Reservoir catchment using GIS as a tool, Sri Lanka, Department of Civil Engineering, University of Peradeniya, Peradeniya , Sri Lanka. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 34 (XXX).
Sophian, R.I., 2009. Contribution of neotectonic activity to drainage basin morphometry development in Tertiary rock formations and Quaternary volcanic deposits in Rancah area, Regency of Ciamis, Province of West Java. Master Thesis, Padjadjaran University, unpublished.
Splitz, W.J. and Schumm, S.A., 1997. Tectonic geomorphology of Mississippi Valley between Osceola, Arkansas and Friars Point, Mississippi. Enginering Geology, 46, p 259-280.
Stewart, I.S. and Hancock, P.L., 1994. Neotectonics, PL Hancock Ed., Continental Deformation, Pergamon Press, p. 370-404.