Deformasi Koseismik dan Pascaseismik Gempa Yogyakarta 2006 dari Hasil Survei GPS

Hasanuddin Z. Abidin, H. Andreas, I. Meilano, M. Gamal, I. Gumilar, C. I. Abdullah

Abstract


DOI: 10.17014/ijog.v4i4.87

The Yogyakarta earthquake of 27 May 2006 occurred at 05:54 WIB with magnitude of 6.4 Mw. It shaked the region of Bantul, Yogyakarta, Sleman and Klaten for about 60 seconds. A week after the earthquake, i.e. 4-8 June 2006, a GPS survey was conducted on 48 GPS points belonging to the 2nd order national cadastral control network located in the earthquake affected region. The 2nd survey was conducted on 21-26 January 2008. The surveys were conducted using 14 dual-frequency geodetic type receivers and the Bernese 5.0 scientific software was used for data processing. The results of GPS surveys show that horizontal components of the co-seismic deformation of earthquake are generally about 10-15 cm or smaller. The GPS-derived displacement vectors and depths of aftershocks suggested the existence of left-lateral fault, with strike and dip angles of about 48o and 89o, located at about 5-10 km east of Opak Fault which is usually drawn along the Opak River. GPS surveys also estimate that horizontal components of the post-seismic deformation of Yogyakarta earthquake are about 0.3 to 9.1 cm between June 2006 and June 2008. While the co-seismic deformation shows the sinistral displacement, the post-seismic deformation indicates the dextral displacement of the eastern region of Opak Fault (Gunung Kidul area) which is relative to a more stable western region.


Keywords


earthquake; Yogyakarta; deformation; co-seismic; post-seismic; GPS survey; Opak Fault

References


Abidin, H.Z., 2007. Penentuan Posisi dengan GPS dan Aplikasinya. P.T. Pradnya Paramita, Jakarta. Edisi ketiga. 398 h.

Abidin, H.Z., Jones A., dan Kahar J., 2002. Survei dengan GPS. P.T. Pradnya Paramita, Jakarta. Edisi kedua. 280 h.

Beutler, G., Bock, H., Dach, R., Fridez, P., Gade, A., Hugentobler, U., Jaggi, A., Meindl, M., Mervant, L., Prange, L., Schaer, S., Springer, T., Urschl, C., dan Walser, P., 2007. Bernese GPS software Version 5.0. In: R. Dach, U. Hugentobler, P. Fridez, and M. Meindl (eds) Astronomical Institute, University of Berne, 612 h.

Massonnet, D. dan Feigl, K.L., 1998. Radar Interferometry and its Application to Changes in the Earth’s Surface. Reviews of Geophysics, Vol. 36, No. 4, November, h. 441-500.

Meilano, I., Kimata, F., Fujii, N., Nakao, S., Watanabe, H., Sakai, S., Ukawa, M., Fujita, E., dan Kawai, K., 2003. Rapid ground deformation of the Miyakejima volcano on 26–27 June 2000 detected by kinematic GPS analysis. Earth Planet Space, 55, h.13-16.

Mori, J., 2004. Earthquake Prediction. Lecture notes on KAGI 21 Summer School. Institute of Technology Bandung, Indonesia. August.

Natawidjaja, D.H., Sieh, K., Ward, S.N., Cheng, H., Edwards, R.L., Galetzka, J., dan Suwargadi, B.W., 2004. Paleogeodetic records of seismic and aseismic subduction from central Sumatran microatolls, Indonesia. Journal of Geophysical Research,109, B04306, doi:10,1029/2003JB002398.

Okada, Y., 1985. Surface Deformation Due To Shear And Tensile Faults in A Half-Space. Bulletin of the Seismological Society of America, 75(4), h. 1135-1154.

Segall. P. dan Davis, J.L.,1997. GPS Application for Geodynamic and Earthquake studies. Annual Reviews of Earth Planet Science, 25, h.301-336.

Tsuji, T, Yamamoto, K., Matsuoka, T., Yamada, Y., Onishi, K., Bahar, A., Meilano, I., dan Abidin, H.Z., 2009. Earthquake fault of the 26 May 2006 Yogyakarta earthquake observed by SAR interferometry. Earth Planets Space, 61, h.29-32.

UGM., 2007. The Yogyakarta Earthquake 2006. Geological Engineering Department, Faculty of Engineering, University of Gajah Mada, 190 h.

USGS., 2006. Website of United States Geological Survey (USGS). Website address: http://earthquake.usgs.gov/eqcenter/recenteqsww/Quakes/usneb6.php#details.

Wolf, P. R. dan Ghilani C.D.,1997. Adjustment Computations, Statistics and Least Squares in Surveying and GIS. John Wiley & Sons, Inc., New York, 564 h.


Full Text: PDF

Refbacks

  • There are currently no refbacks.


Creative Commons License
Indonesian Journal on Geoscience by https://ijog.geologi.esdm.go.id/index.php/IJOG/index is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

 

Indexing Site :

 

 

 

Follow us on:


shopify visitor statistics
View My Stats