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Santoso Santoso
Pusat Survei Geologi
Chemistry Earth & Planetary Sciences Energy

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DINAMIKA BENTANG ALAM DAN PENGARUHNYA TERHADAP ASPEK FISIK LAHAN DAERAH SOLOK –SINGKARAK, PROVINSI SUMATRA BARAT Santoso Santoso; Ungkap M. Lumbanatu
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.v20i2.165

Abstract

The investigated area of Singkarak and surrounding areas belong to Median Graben at Sumatra Fault Zone. Danau Singkarak is one of the bigest lake in west Sumatra, it has a shape of elongate southeast to northwest in direction. Landform arround Danau Singkarak, are represented by Alluvial Fan (F5), River Terrace (F2), Eroded Structural Terrace (S1), Eroded Fault Scarp (S2), and Undulating Fault Hills (S3). Those landforms are known as tectonic origin (endogen). While far away form Danau Singkarak landforms are represented by exogen origin such as Karst Origin (K1, K2), Denudational Origin (D1, D2, D3) and Volcanic Origin (V2). The landforms on east and west side of Danau Singkarak have difference characteristics. On the east side of Danau Singkarak area landform are characterized by fault scarp which has a very steep slope included landslide, while on west side are characterized by aluvial fan with gently slope. Base on the physical character of tectonic landform, the tectonic activity become higher toward Danau Singkarak which is shown by the alluvial fan produced by Sawah Puding Fault (Karang Alluvial Fan, Airhilang Alluvial Fan, and SaningbakarAlluvial Fan) are being actively till present. This activities also characterized by the destructive earthquake occurrences. Non active alluvial fans distributed far away from Danau Singkarak shuch as the Padanglawas Alluvial Fan, Tanjung Sawah Alluvial Fan and Guguk Alluvial Fan. Those alluvial fans are produced by Air Mundak Fault.Keywards: Singkarak Lake, landform, active alluvial fan, non active alluvial fan, exogen, endogen activity.
ANALISIS BAHAYA GEMPA BUMI LENGAN UTARA SULAWESI Santoso Santoso; Asdani Soehaimi
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 6 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i6.182

Abstract

The Megatrust and Benioff subduction seismic sources of the Sulawesi Sea Micro Plate subducted at 100 km beneath of North Sulawesi's Arm have significant effect in radius of 150 km in this peninsula. The Deterministic Seismic Hazard Analysis-DSHA from megathrust seismic source zone using attenuation function model of Young et al (1997) to the Manado City result in 0.22 g, equal to VIII MMI. Microzonation efforts in this region are conducted in order to mitigate future seismic hazards.Keyword: Seismic hazard, attennation function, Maximum Credible Earthquake (MCE) and Maximum intensity
MORFOLOGI DAN UMUR PERPINDAHAN ALUR SUNGAI OPAK DI DAERAH BERBAH SLEMAN Santoso Santoso
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 4 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i4.209

Abstract

The morphologic condition of the Opak valley at Dadapan Village, Berbah area, indicates that the Opak River has three times shifted. Based on the passing compass land detail measurement, three paleo river valleys, can be recognized which are separated by terrace morphology. The result of carbon dating by using C14  method to the organic clay deposits which was taken from Opak valley 1, 2, 3, and existing river, shows the ages are 6950 years BP, 6800 years BP, 6430 years BP, and 6360 years BP. It proves that the tectonic in this area is very active, because during Upper Holosen (‹ 10,000 years) the Opak River has three times shifted. Keywords: paleo river channel, shifting, tectonic
MORFOGENESIS DAERAH DANAU KALDERA MANINJAU, SUMATERA BARAT Santoso Santoso; Ungkap M.Lumbanbatu
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 2 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i2.282

Abstract

Geomorphologically, the investigated area can be classified into several morphologic origins, i.e: volcanic, fluvio-volcanic, volcanic denudated, denudational, structural-volcanic and fluvial. Moreover, on the basis of the aerial photo interpretation and ground checking, two volcanic cones can be recognized, i.e., old and young Maninjau volcanoes. This assumption supported by the bathymetry map of the Maninjau Lake that shows two points of maximum depth at different locations, -168 m in the north and -169 m in the south sides respectively. These data indicate that the volcano has two different eruption centres. Keywords: geomorphology, fluvio-volcanic, denudational, structural
DEFORMASI LANDFORM PASCAGEMPA TEKTONIK JOGJAKARTA 27 MEI 2006 Santoso Santoso
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 5 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i5.311

Abstract

The tectonic earthquake of Jogjakarta 2 7 Mei 2006 caused damages and more than 6000 people died.  The damage include houses, office buildings, public service, and other infrastructure.   On the other hand, the earthquake causes landform deformation along the Opak fault Zone and Patuk  fault  Zone, such as land crack, rock slide/fall, and liquefaction in a dug well.                                                                                                                                                                  Based on field identification of the landform deformation and damage pattern, two imaginary lines namely Opak fault Zone and Patuk fault Zone can be traced. Opak fault Strip elongates from end of the Opal River to Prambanan with general direction NW-SE,  while the Patuk fault Strip elongates from Parangtritis-Patuk to Gantiwamo/Wedi,  Klaten Regency with direction N40-450E. Keywords: landform deformation, earthquake
Co-Authors Asdani Soehaimi Ungkap M. Lumbanatu Ungkap M.Lumbanbatu