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All Journal IJOG : Indonesian Journal on Geoscience Fibusi (Jurnal Online Fisika) Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Cecep Sulaeman
Pusat Vulkanologi dan Mitigasi Bencana Geologi, Jl. Diponegoro No. 57 Bandung
Earth & Planetary Sciences Education Energy Engineering Environmental Science Physics

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Karakterisasi sumber gempa Yogyakarta 2006 berdasarkan data GPS Sulaeman, Cecep; Dewi, Lestari Cendekia; Triyoso, Wahyu
Indonesian Journal on Geoscience Vol 3, No 1 (2008)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (737.776 KB) | DOI: 10.17014/ijog.v3i1.47

Abstract

http://dx.doi.org/10.17014/ijog.vol3no1.20085The southern part of Central Jawa is one of earthquake hazard prone areas in Indonesia an earthquake occurred on May 27, 2006 and had the moment magnitude 6.3. Base on the GPS observation, the characterization of the epicenter and source of this Yogyakarta earthquake can be estimated using the displacement estimation and strain at the measurement point by using a simple kriging and sequential gaussian simulation method. The direction of the displacement and maximum shear strain anomaly in this research was shown by the fault of SW – NE direction and the displacement pattern shows that this fault is left lateral strike slip movement. The positive anomaly of the maximum shear strainis located about 10 km east of Bantul, which suggests as the position of Yogyakarta 2006 earthquake source, with the moment seismic and moment magnitude values are 8.1385 x 1025 dyne cm, and 6.5 respectively.    
METODE MIKROTREMOR UNTUK MIKROZONASI GEMPA BUMI DI KOTA CILACAP Sulaeman, Cecep; Ardi, Nanang Dwi
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Publisher : Program Studi Fisika

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Keadaan Kota Cilacap yang berhadapan dengan zona subduksi Jawa di Samudera Hindia, serta adanya patahan Pamanukan-Cilacap menyebabkan adanya potensi gempa bumi yang dapat terjadi kapan saja. Oleh karenanya dibutuhkan upaya mitigasi bencana gempa bumi. Salah satu upaya mitigasi gempa bumi di Kota Cilacap adalah dengan membuat peta mikrozonasi gempa bumi. Pada penelitian ini telah dibuat peta mikrozonasi gempa bumi di Kota Cilacap berdasarkan hasil pengolahan data mikrotremor. Data mikrotremor diukur pada tanggal 29 April 2014 sampai dengan 3 Mei 2014 dengan menggunakan metode pengukuran single station, dan diolah dengan menggunakan metode HVSR. Hasil pengolahan data berupa nilai periode dominan dengan rentang nilai antara 0,28 s - 3,92 s, VS30 dengan rentang nilai antara 30,6 m/s - 430,8 m/s, dan PGA dengan rentang nilai antara 0,00404 g – 0,015139 g. Hasil penelitian ini berupa peta mikrozonasi yang mendeskripsikan zona bahaya bencana gempa bumi di Kota Cilacap. Hasil penelitian ini bermanfaat dalam upaya mitigasi bencana gempa bumi serta dapat digunakan dalam perencanaan dan pengembangan Kota Cilacap.
Pengaruh Gempabumi Tektonik Terhadap Aktivitas G. Gede Hidayati, Sri; Sulaeman, Cecep; Supartoyo, Supartoyo; Kriswati, Estu
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 4 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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In addition to home for seven active volcanoes, West Java, is also having high tectonic activity, owing to its close distance from subduction zone and crustal fault. The Cimandiri Fault extends about 100 km from southwest to the northeast ward through Sukabumi area. Gede Volcano with high seismic activity is sitting 20 km north of Cimandiri Fault. Shallow earthquakes often occur around Gede volcano and their sources are fairly close to the Cimandiri valley. Feltearthquakes occurred in 2007, 2010, 2012 and 2014,where the source supposed to be around Cimandiri valley,were followed by volcano-tectonic (VT) earthquake swarms in Gede Volcano. These swarms probably indicate that there is a linkage between tectonic and Gede volcano activities. However, the swarms were followed by less significant changes in volcanic activity. GPS data during measurement period of 2006-2015 show the existence of a fault with main stress in the northwest-southeast direction. The mechanism of the Cimandiri Fault is reverse fault with sinistral slip component and sinistral strike slip fault, while the swarm of VT earthquakes in Gede Volcano is dominated by reverse and normal faults. Tectonic earthquakes may trigger nearby volcanic eruption; it depends on the state of magma of the volcano and the magnitude of the earthquake.Keyword: Tectonic, Cimandiri fault, VT earthquake, Gede Volcano.
Tectonic Model of Bali Island Inferred from GPS Data Sulaeman, Cecep; Hidayati, Sri; Omang, Amalfi; Priambodo, Imam Catur
Indonesian Journal on Geoscience Vol 5, No 1 (2018)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1743.905 KB) | DOI: 10.17014/ijog.5.1.81-91

Abstract

DOI: 10.17014/ijog.5.1.81-91Seven periods of GPS campaign have been conducted for three years since March 2013 - October 2015 on fourteen GPS sites across Bali Island. The GAMIT/GLOBK 10.6 version was used to compute data with respect for thirteen reference sites of International Terrestrial Reference Frame (ITRF) 2008 surrounding Bali. The result shows that horizontal displacement varies between 1.93 and 22.53 mm/yr dominantly northeastward. Vertical displacement ranges at -184.34 to 33.79 mm/yr. The result of modeling using Coulomb 3.3 version indicates the deformation in Bali was mostly contributed by subduction at the southern part, West and East Flores Back-Arc Thrust at the north, Lombok Strait Fault and a fault at the eastern coast of Bali with the estimation maximum magnitude of 7.1, 6.6, 6.8, 5.8, and 5.2, respectively.
Co-Authors Estu Kriswati Lestari Cendekia Dewi Nanang Dwi Ardi Omang, Amalfi Priambodo, Imam Catur Sri Hidayati Supartoyo Supartoyo, Supartoyo Triyoso, Triyoso