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All Journal IJOG : Indonesian Journal on Geoscience Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Hasanuddin Z. Abidin
Kelompok Keilmuan Geodesi, FITB, Jln. Ganesha 10, Bandung 40132
Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Deformasi Koseismik dan Pascaseismik Gempa Yogyakarta 2006 dari Hasil Survei GPS Abidin, Hasanuddin Z.; Andreas, H.; Meilano, I.; Gamal, M.; Gumilar, I.; Abdullah, C. I.
Indonesian Journal on Geoscience Vol 4, No 4 (2009)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1158.056 KB) | DOI: 10.17014/ijog.v4i4.87

Abstract

DOI: 10.17014/ijog.v4i4.87The 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.
KARAKTERISTIK, TIPE DAN BIDANG GELINCIR PADA ZONA LONGSOR CILOTO, JAWA BARAT BERDASARKAN ESTIMASI METODE GEODETIK Kahar, Joenil; Santoso, Djoko; Sadarviana, Vera; Abidin, Hasanuddin Z.
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 2 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (408.506 KB)

Abstract

Slip surface is delaminates between sliding material and undisturbed slope material. In limit equilibrium method, slip surface is used as reference for safety factor calculation. Landslides phenomenon can be observed using of GPS satellite technology to mitigation and material displacement monitoring. For that purpose, this research is carried out to estimate characteristic, type and slip surface position at Ciloto landslide zone by GPS survey.First, estimation of slip surface is carried out by slope surface profile which referred to same direction of horizontal displacement of monitored points. The same direction of horizontal displacement at several monitored points indicate that the monitored points can be located at the same slip surface. Second, maximum-minimum function of geometric method and polynomial approach, including graphical method by velocity trend line plotting for each monitored point, were done to find out point position at slip surface. Ideal planar slip surface is determined by infinite slope analysis and circular slip surface is determined by circle arc analysis. Estimation of slip surface by geodetic method approach couldn't give result because geodetic data describe slope surface. By intersection of velocity trend line of monitored point, it can gave estimation of slip surface location. Geodetic approach could gave estimation of scarp position as well as crack which is indicate beginning of slip surface. Locations of scarp in vertical profile have suitability with result of geology research at same study area.Ciloto landslide zone is classified in very slow velocity landslide (5 x 10-5 - 5 x 10-7 mm/second). The characteristic of horizontal displacement has various direction for each monitored point. Vertical displacements of monitored point have subsidence and uplift or bulging. That characteristic formed hummocky terrain and the other side of zone have gradual slope. From the research, the landslide type at Ciloto zone is multiple compound (rotational and translational) debris slides.Keywords : geodetic method, GPS survey, landslide characteristic, landslide type, slip surface, multiple landslide, scarp
Co-Authors C. I. Abdullah Djoko Santoso H. Andreas I. Gumilar I. Meilano Joenil Kahar, Joenil M. Gamal Vera Sadarviana, Vera