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All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
U. M. Lumbanbatu, U. M.
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Education Energy Engineering Environmental Science

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GEOLOGI BAWAH PERMUKAAN KAITANNYA DENGAN POTENSI PELULUKAN / LIKUIFAKSI DI DAERAH ERETAN DAN LOSARANG, JAWA BARAT Lumbanbatu, U. M.; Hidayat, S.
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 2 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The investigated area which belongs to the coastal plain is composed of Quaternary sediments such as soil, swamp, near shore, offshore and pre-Holocene sediments. Further more, near shore sediment can be divided into sand flat, mixed flat, mud flat and beach sand. In general those sediments are still loose and water saturated. Among beach sand, sand flat and mix flat have a high level of vulnerability to liquefied. Based on seismic data, an occurrence of earthquakes can be triggered by two earthquake sources namely subduction sources. An earthquake took place on August 8, 2007 at 04:58 known as Indramayu Earthquake is an example of eartquake triggered by subduction zone since the quake has a depth of 289.2 Km with a magnitude of M 7.5 on the Richter scale. From the geological aspect and seismicity point of view the investigated area is potential for experience liquefaction events. Based on the physical properties of the sand deposits and their stratigraphical position as well as other factors such as a thickness of sand layer, types of overlay and underlain sediments then a liquefaction susceptibility in this region can be divided into very low liquefaction susceptibility region, low liquefaction susceptibility region and high liquefaction susceptibility region.Keywords: quaternary, earthquakes, liquefaction, Inramayu
POTENSI BENCANA PELULUKAN DI DAERAH LABUHAN KABUPATEN PANDEGLANG PROVINSI BANTEN Lumbanbatu, U. M.; Hidayat, S.; Poedjopradjitno, S.
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 2 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Was done Labuhan, Banten Province, and sourounding area located on alluvial plain are composed of loose, water saturated clastic sediments such as gravel, sand, silt and clay, suseceptible to liquefaction. Investigation of potensial liquefaction hazards to identify degree of liquefaction susceptibility and its ditribution in investigated area. An earthquake source zone trigger liquefaction origionated by subduction activity as well as by activation of faulst on Sunda Strait. To obtain subsurface geological data hand drilling were conducted getting 59 bore holes; known a liqueable material such as sand deposited on beach sand, beach ridges, and palaeo channel deposits. On the basis of grain size distribution and its physical characteristics, stratigraphical position, ground water level, liquefaction susceptibility in this area can be divided into high liquefaction susceptibilityintermediate liquefaction susceptibility, low liquefaction susceptibility, and very low liquefaction susceptibilityKey words : liquefaction, earthquake, water saturated sand, labuhan
Co-Authors S. Hidayat, S. S. Poedjopradjitno, S.