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S. Hidayat
Pusat Survei Geologi
Chemistry Earth & Planetary Sciences Energy

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POTENSI BENCANA PELULUKAN DI DAERAH LABUHAN KABUPATEN PANDEGLANG PROVINSI BANTEN U. M. Lumbanbatu; S. Hidayat; S. Poedjopradjitno
Jurnal Geologi dan Sumberdaya Mineral Vol. 22 No. 2 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v22i2.111

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i2.139

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
SEDIMENTOLOGI DAN AKUMULASI KASITERIT PADA ENDAPAN ALUVIUM SEPANJANG AIR INAS HINGGA LAUT LEPAS PANTAI TANJUNG KUBU (TOBOALI), BANGKA SELATAN Herman Moechtar; S. Hidayat
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 | DOI: 10.33332/jgsm.geologi.v20i2.162

Abstract

Placer cassiterite deposits of Air Inas suggest that the deposits consist of mass flows of coarse grains (A1), mass flows of fine grains (A2), offshores (B.1), nearshores (B2), fluvial (B3), Recent deposits of nearshores (C1), and flood basin deposits (C2). The research was based on analizing sedimentology and stratigraphy of eleven boreholes available along North to South traverse. Depth of bore hole varied from 1.60 to 12.20 at elevation of + 25,00 to – 7,20 m of sea level. Based on a series of sedimentary environment correlation, alluvial deposits can be divided into three sedimentary intervals (A,B and C). Each interval is characterized by environmental changes controlled by transgression and regression as well as climatic changes. Referring to cassiterite genesis there are three phenomena namely chemical and physical weatherings, transgression effect and climate changesKeywords: placer deposits, sediment, stratigraphy
INTERAKSI FAKTOR KENDALI TEKTONIK, PERMUKAAN LAUT DAN PERUBAHAN KLIM DI DAERAH TELUK KLABAT, KABUPATEN BANGKA INDUK, BANGKA S. Hidayat; Herman Moechtar
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 1 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i1.191

Abstract

The study of the Quarternary deposits in Klabat gulf areas was based on the analyses of the sedimentology and stratigraphy of fifteen borehole information obtained along west to east. The penetration of the bore head varied from 3.50 to 16.80 m from + 21 m to - 4 m of sea-level. Whereas, the Quarternary sediments in the studied area can be divided into seven sedimentary environments, consisting of alluvial fan (FKa), swamp (FRw), floodbasin (FCb), deltaic (FDt), sand beach (FPp), nearshore (FLdp), and nearshore to offshore (FLdp to FLlp) deposits. Based on the lateral and vertical sedimentary environment correlations, the Quaternary stratigraphic succession can be divided into four sedimentary intervals (IP I to IV). Each interval is typically for topography and elevation changes which is controlled by changes of the sedimentary environment systems. The controlling main factor of the sedimentary environment system changes was regional and local tectonics. Changes in tectonic regime are important upon a tidal flat sedimentation. Keywords: facies, paleoenvironment, tectonic
PERUBAHAN LINGKUNGAN PENGENDAPAN HUBUNGANNYA DENGAN TEKTONIK KUARTER (Studi Kasus Geologi Kuarter di Wilayah Dataran Rendah Aluvial Hingga Pantai Sepanjang Maron- Sikucingkrajan, Kec. Gemuruh, Kab. Kendal (Jawa Tengah) Soemantri Poedjoprajitno; Herman Moechtar; S. Hidayat
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 2 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i2.198

Abstract

Quaternary deposits of the alluvial plain to coastal plains in the Kec. Gemuruh, Kabupaten Kendal in the north-coast of Java (The Central Java Province) have been studied. The study was based on an analyses of geological surface and subsurface, especially of six boreholes information obtained along the North-South, and the penetration of the bore head varied from 2.80 to 6,65 m. These Quaternary deposits, can be devided into Members of Sandstone Damar Formation (Tpds), Damar Formation (Qtd), floodbasin and river channel deposits. Based on the correlation of the lateral and vertical variations of the deposition environment in the eastern part, the sediment accumulations were recognised which are related to fault activities. Whereas, the sediment accumulations in the western part influenced by normal fault. The tectonic activities which controlled the deposition processes were recorded as two stages. These were, (1)the activity of uplift fault obtained along the West to East, (2)the activity of uplift with direction West to East in the northern part followed by activity of normal fault towards almost North-South. Relative sea-level changes affect coastal-plain environment, they are influenced by local tectonic and global of sea-level changes. The tectonic activity also would cause shallowing and steepening of the depositional slope. Keywords : Quaternary sediments, tectonic, structure geology, sediment accumulation
PENGARUH TEKTONIK PADA RUNTUNAN ENDAPAN ALUVIAL DEPRESI PADANGSIDEMPUAN, SUMATERA UTARA Ungkap M Lumbanbatu; C Basri; S. Hidayat; Darwin A Siregar
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 3 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i3.202

Abstract

The investigated area, that is so called Padangsidempuan depression has been filled up by unconsolidated fluvial sediments. The sediments can be distinguished into five different environments, these are flood basin deposit, flood plain deposit, palaeo channel deposit, swamp deposit and colluvium deposit. To understand the influence of tectonic activities on lithological succession of the studied area several profiles were made. It reveals, that lithological successions have been disturbed by tectonic activities such as subsidence and uplifted. Subsidence can be identified by alternating of swamp facies deposit within different stratigraphic position and superimposed of the Batang Toru river on the palaeo channel deposit three (Ch-3). Further more the effect of uplifting caused palaeo channel deposit shifting horizontally. The data show that the tectonic activities in the studied area are not so very intensive. Keywords: quarternary tectonics, palaeo channels, pull-apart basin, sedimentary sequences
KERENTANAN EROSI DI DAERAH MANADO DAN SEKITARNYA, SULAWESI UTARA S. Hidayat; Suharsono Suharsono
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 6 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i6.316

Abstract

Evolution cycle of landform in Manado and surrounding area is  caused by  weathering, erosion, transportation, sedimentation, and human factors. These processes have occurred since the land existence, and theywere strongly accelerated   by human  activities.Based on slope level, soil/rock type, vegetation/land covers, and erosion type, the erosion susceptibility in the studied area can be grouped into: high, medium, low,  and no erosion.Very high erosion occurs  on landform  of volcanic cone a and  b, volcanic slope a and b, mountain  dissected volcanic slope and dissected straight  volcanic mountain. High erosion occurs on landform  of solfatara field, fumarola, volcanic foot slope b, volcanic mountain slope elongated  dissected, volcanic slope c, residual  hill and lava flow. Medium erosion occurs on landform of volcanic  foot slope a and alluvium  fan.  Lowerosion occurs on landform of volcanic  foot slope c, intermountain plane and flood plain. No erosion occurs on landform of alluvial.Keyword: erosion succeptibility, Manado, weathering, transportation, sedimentation
Co-Authors C Basri Darwin A Siregar Herman Moechtar S. Poedjopradjitno Soemantri Poedjoprajitno Suharsono Suharsono U. M. Lumbanbatu Ungkap M Lumbanbatu