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Ismawan -

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Author-ID : 207461

Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Environmental Science

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TINJAUAN KETERDAPATAN BATUAN ULTRAMAFIK DALAM KOMPLEK OFIOLIT CILETUH DI DAERAH CILETUH, JAWA BARAT Hutabarat, Johanes; -, Ismawan
Bulletin of Scientific Contribution Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Ultramafic rock is defined as rock with a color index of more than 70, and most have good characteristics as igneous plutonic and metamorphic rocks. Ultramafic rocks in the area Ciletuh revealed in outcrops scattered as "pockets" (enclaves) in Ciletuh formation, with the tendency of azimuth northeast trending ± southwest, which gives the impression of intrusion body, or as blocks of exotic in Ciletuh Formation. Rock composed of peridotite and serpentinite of massive to foliated; associated with gabbro, basalt pillow structure. Association of peridotite-serpentinite with gabbro, basalt structure of the pillow, giving the impression that the rock may represent parts of the set ophiolite. Based on occurences in the field, where the body is suspected origin of ultramafic rocks in the ophiolite complex Ciletuh speculated a continuous sheet relicts oceanic crust that is emplaced above microcontinent. Part sheet becomes incomplete (dismembered) during emplacement, and then buried (burial) by next geological events (possible sedimentation process produces Formation Ciletuh) that largely hides covered by ofiolitic, and leaving only the ultramafic body which spread in most Ciletuh areas at West Java.

IDENTIFIKASI DAN MITIGASI PADA ZONA RAWAN GEMPA BUMI DI JAWA BARAT -, Zufialdi Zakaria; -, Ismawan; -, Iyan Haryanto
Bulletin of Scientific Contribution Vol 9, No 1 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Java Island is a region of frequent earthquakes with varying strength. Most of destructive earthquakes measuring over 5.6 on the Richter Scale, as a shallow earthquake with a depth of less than 30 KM. On land, the earthquake can damage a variety of infrastructure and endanger lives. At ocean, earthquakes tend to be a potential tsunami. The tsunami that ever happens is in the south of Pangandaran beach on July 27, 2006. To reduce the impact of the earthquake disaster, the identification and mitigation is required. In the identification of the earthquake in the mainland, the earthquake potential of fault-lines are shown on a large faults, there are: Earthquake's Row of Zone Bayah, Earthquake Row of Baribis Zone, Earthquake Row of Cimandiri Zone, Earthquake Row of Lembang Zone, Earthquake Row of Citanduy Zone. On the identification of the earthquake in the ocean, is required analysis to see the condition of the epicenter in the southern Teluk Pelabuhan Ratu. Mitigation of earthquake disaster can be done, among others through the various activities that need to be socialized, assisted by experts from various disciplines.

TEKTONIK DAERAH MUARA TEBO PROPINSI JAMBI -, Iyan Haryanto; -, Ismawan; -, Faisal Helmi; -, Edy Sunardi; -, Oeke Sobarin; Indah Putri, Yunita Rossa
Bulletin of Scientific Contribution Vol 6, No 1 (2008): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Geological structure of Muara Tebo area was influenced by subduction between Eurasian and India-Australian Plates. Regional tectonic of this area dominantly yield an amount of fault structure with orientation Northwest-Southeast.Structural pattern of study area dominated by dextral strike-slip and thrust fault, with orientation Northwest-Southeast. The dextral strike-slip fault represent the first structure formed (Early Tertiary) which influenced by transtensional stress. Further, on Neogene Tectonic period the structures influenced by tranversional stress system which affecting inversion. This late tectonic yield an amount of thrust fault.

EVOLUSI TEKTONIK BERDASARKAN ANALISIS DATA KEKAR DAERAH BINUANG DAN SEKITARNYA, KECAMATAN BINUANG, KABUPATEN TAPIN, PROVINSI KALIMANTAN SELATAN Yusuf, Andi Supian; -, Ismawan; Helmi, Faisal
Bulletin of Scientific Contribution Vol 12, No 3 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v12i3.8376

Research area administratively located in Binuang district, Tapin Regencies, South Kalimantan Province. Geographically located in coordinate 115° 3' 40,359" East Longitude until 115° 15' 49,871" East Longitude and 3° 1' 7,068" South Latitude 3° 16' 10,038" South Latitude. Based on its physiography aspect, the research area is part of Barito Basin. The object of these research area the geological structures which is focused on the measurement of the fractures on rocks which represents each present tectonic periods, which is used for determining force and the tectonic pattern in the research area. As seen from the field data, it is known that the geological structures available in the research area are anticline, sincline, fracture, sinistral wrench fault, and reverse fault. The tectonic evolution on the research area begins during rifting which continues since Pra-tersier until Eosen with NE-SW direction, resulting the reverse faults with the fault surface estimated to be NW-SE direction, during Pliosen period reactivation of older faults happened on research area. The tectonic process changed into compression with NW-SE direction.

Co-Authors Andi Supian Yusuf, Andi Supian Edy Sunardi Faisal Helmi Faisal Helmi -, Faisal Helmi Iyan Haryanto -, Iyan Haryanto Johanes Hutabarat Oeke Sobarin -, Oeke Sobarin Yunita Rossa Indah Putri, Yunita Rossa Zufialdi Zakaria

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