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MIKROTREMOR DAN PERCEPATAN TANAH MAKSIMUM KOTA MAKASSAR Soehaimi, Asdani
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 1 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Makassar city has a relatively far distance > 50 km to the seismic source zone,but the soft soil condition in this area produced significant amplification of earthquake ground shaking. Therefore, a microzonation study as a risk analysis of local site response is basicaly needed. In this research, the earhquake microzonation map was made based on a soil dinamic characterization of a microtremor investigation. The soil having a long predominant period is more risky compared to that having short period of soil. The dominant period of soil at this investigation was calculated based on horizontal towards vertical spectral ratios (H/V) of microtremors, meanwhile the microzonation map of Makassar City was made based on the variation of a predominant period. The result of calculation shows that the south-western part of Tamalanrea district has the longest predominant period. This predominant period gradually dereases to the eastern part of Makasasar City. Peak ground accelaration studies show the maximum ground accelaration is not defferent between one and the other districts. The maximun ground accelaration belongs to Biringkanaya,Tamalanrea and Manggala districts (58,80 gal, 56,84 gal and 55,86 gal for 500 years) in the eastern part of Makassar City. This ground accelaration value becomes less to the west, because the main seismic source zone of Walanae active fault is located at the eastern part of Makassar City. Keywords: microzonation, microtremor, earthquake source zone, site respons, peak ground acceleration

MIKROZONASI KERENTANAN BAHAYA GONCANGAN GEMPA BUMI KOTA PEKALONGAN BERDASARKAN ANALISIS MIKROTREMOR Soehaimi, Asdani; Marjiono, Marjiono; Kamawan, Kamawan
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 5 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Microzonation of Pekalongan is divided into 3 zones: Ground shaking prone zone I, characterized by very high amplification (>9 times), 0.93 – 1.15 second dominant period and soft sediment thickness between of 40.14 – 50.29 m; ground shaking prone zone II, characterized by high amplification (6-9 times), 0.55 – 1.49 second dominant period of second and soft sediment thickness between 23.91 – 65.30 m; ground shaking prone zone III, characterized by intermediate amplification (3-6 times), 0.47 – 1.54 second dominant period, and soft sediment thickness between 20.73 – 67.31 m.In generall, Pekalongan has amplification between 3, 17 – 12, 91 times. More than 50 % of its area has high amplification, some small spots/areas have very high amplification, and the rest area have intermediate amplification.Microzonation is as the preliminary step for earthquake risk mitigation efforts.In order to reduce the hazard risk, the local government must have policies on spatial planning. Regions which have high – very high amplification need to be developed with specific construction.Keywords: Pekalongan, microzoantion, amplification and predominant period

PATAHAN AKTIF DAN KEGEMPAAN DAERAH PLTA CIRATA - SAGULING DAN SEKITARNYA Soehaimi, Asdani
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 6 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Electric Hydro Power of Cirata (PLTA) and Saguling are located at the active thrust fault of Citarum – Cisomang (1) and Saguling (2). The gravity modelling on the north – south direction, shows these structures geology as the bounderies of the structural basin of Cirata and Saguling which are filled by Young Volcanic Deposites. Microearthquakes at the Saguling (I), Cirata (II) and Pasir Cabe (III), have the depth of < 10 Km and shown the thrust, strike slip and normal fault focalmechanisms. The maximum magnitude calculated which was based on the vertical displacement (dip slip) of two main revers fault above are 7 Ms with return period of 80 years.Keywords: active fault, maximum magnitude, return period, Cirata

MIKROZONASI DAERAH KENDARI DAN SEKITARNYA BERDASARKAN RESPONS TANAH SETEMPAT Marjiyono, Marjiyono; Soehaimi, Asdani; H. Setiawan, J.
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 1 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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As one of the provincial capital city which is growing fast, database of earth sciences is absolutely required In order to develop the secure of Kendari town. Measurement of microtremor in this region aims to know the site response forward ground shacking. The result of microtremor analysis indicates that the distribution of dominant period of H/V ratio of Kendari and its surrounding area is parallel to Kendari bay, and turning south to follow the pattern of Wanggu river. Susceptibility level in this area which is represented by dominant period values is divided into four categories (> 1.5 seconds, 1.5 -1.0 seconds, 1.0- 0.5 seconds, and <0.5 second). Generally, the pronest area coinciding with recent sedimentation area, is around Kendari Bay and along Wanggu river, while towards outside are it is safer. Keyword:microtremor, ground shacking, Kendari

PENARIKHAN RADIOKARBON DALAM PENENTUAN AKTIVITAS TEKTONIK KUARTER DI SEPANJANG ALIRAN SUNGAI OPAK DAN PANTAI SAMAS, YOGYAKARTA Siregar, Darwin A; Soehaimi, Asdani
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 2 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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The Samas beach ridges and river terraces of Opak, Progo, Oyo and Berbah in the research area were formed by the neotectonic activities since ± 7000 years ago until Recent. Materials for Radiocarbon dating consists of mollusc and organic clay found in the beach ridge and river terrace deposits. The oldest Samas beach sand is 1980 ± 120 years BP and Opak River terrace at Berbah is 6950 ± 300 years BP. Meanwhile, the Oyo River terrace at Siluk is 2640 ± 100 years BP and Opak River terrace at Karang is 1220 ± 120 years BP. The dynamic neotectonic activities of Samas beach are represented by the uplifting and shifting of the coast line, meanwhile at Berbah, Siluk and Karang are indicated by uplifting end shifting of the river base level. These dynamic activities were caused by the regional tectonic activity related to subduction in the south of Java island and the local tectonic activity along the Opak fault zone. Keywords : Dynamic of beach sand, river terrace, elevation and radio carbon dating

KAJIAN PENGARUH GEMPA BUMI MERUSAK DI WILAYAH PROVINSI BENGKULU TERHADAP PLTA MUSI Soehaimi, Asdani
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 5 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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The PLTA Musi is located in a pull apart basin between Ketahun and Musi - Keruh segments of Sumatera fault zone. The geotechnical subsurface of PLTA Musi is divided into four layers involving basement rock layer 1 with N = 1000, Vs =646 m/second; basement rock layer 2 with N = 500, Vs =521 m/second, and thickness h= 12 - 16 m; soft rock layer 1 with N = 200 and Vs = 392 m/second, thicknes h = 6 - 14 m, soft rock layer 2 with N = 100, Vs = 316 m/second, and thickness h = 10 - 26 m. The natural period (Ts) between based rock layer 1 and 2 is 0,092 second ≤Ts≤ 0,099 second, for based rock layer 2 and soft rock layer 1is 0,06 second ≤ Ts ≤ 0,1 second, and soft rock layer 1 and 2 is0,12 second ≤ Ts ≤ 0,26 second. The 1979 and 1997 Kepahyang destructive earthquakes have significant influences to the PLTA Musi with maximum ground accelaration 133,59 gal and equivalent intensity VII MMI or VII MSK.Destructive earthquakes of magnitude Ms = 5 will occur at PLTA Musi at recurrent time of 10 years and earthquake of magnitude Ms = 6, Ms = 7 and Ms = 8 at 40 years, 160 years and 630 years.Keywords: The Musi PLTA,destructive earthquake, earthquake hazard and risk

IDENTIFIKASI SESAR AKTIF DAERAH CEKUNGAN BANDUNG DENGAN DATA CITRA LANDSAT DAN KEGEMPAAN Marjiyono, Marjiyono; Soehaimi, Asdani; Kamawan, Kamawan
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 2 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Seismic monitoring around Bandung basin since 1999 - 2006 which has been carried out by the Seismological Laboratory, Geological Survey Institute, had recorded nine earthquakes. Epicentre location of the earthquakes indicated that the earthquakes are associated with the lineaments interpreted on landsat image. It is concluded that there are at least five active faults in this area such as Tanjungsari - Cileunyi, Lembang, Cicalengka, Jati and Legok Kole fault. Keywords: active fault, epicenter, lineament, landsat image

ANALISIS BAHAYA GEMPA BUMI LENGAN UTARA SULAWESI Santoso, Santoso; Soehaimi, Asdani
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 6 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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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

POTENTIAL EARTHQUAKE HAZARD MICROZONATIONS OF THE JAKARTA CITY Soehaimi, Asdani
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 2 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Jakarta, the capital city of the Republic of Indonesia, is a potential earthquake hazard area. The city lies on the very thick ( >294 M ) Quaternary sediments. Destructive earthquakes influenced this city were generated from the subduction and active faults with the Maximum intensity of VI - VII MMI. A microtremor investigation to the shallow soft Quaternary sediment results in the dominant period of 0.05 – 0.85. The classification of this dominant period is the basic classification of rock and soil site and as an important factor of the earthquake hazard susceptibility in a region. Dynamic site responses, which are presented by the multiply of amplification factors and natural dominant periods of this city are divided into five microzonations, these are :– Very high susceptibility microzonation (index's > 10), covers the area of 7.58 km2 or 1.15 % of the total region of Jakarta occupies a small area of North Jakarta.– High susceptibility microzonation (index's 7.5 – 10 ), covers the area of 18 km2 or 2.73% of the total region of Jakarta consisting of small area of North Jakarta city (Kapuk resort), Central Jakarta including the area of Setiabudi.– Moderately susceptibility microzonation (index's 5-7.5), covers the areas of 86.59 km2 or 13.11 % of the total region of Jakarta, including the North, Central, East and South Jakarta and the small area of West Jakarta .– Low susceptibility microzonation (index's 2.5 - 5), covers the area of 324 km2 or 49.18 % of the total region of Jakarta, and it occupies the western part of North Jakarta, eastern part of west Jakarta and the central part of central Jakarta.– Very low susceptibility microzonation (index's < 2.5 ), covers the area of 223.47 km2 or 33.83 % of th total region of Jakarta , the area includes a small part of the central Jakarta and the eastern part of west Jakarta.These earthquake hazard microzonations are one of important data base for regional planning in order to mitigate earthquake hazards and risks of the Jakarta city. Keywords: Earthquake hazard microzonation and regional planning

Penentuan Bidang Gelincir Longsoran berdasarkan Karakteristik Fisis Batuan dengan Seismik Bias Dangkal di Daerah Cililin, Bandung Marjiyono, Marjiyono; Soehaimi, Asdani; H. Setiawan, Januar
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 6 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Hazard history of the Cililin area shows that landslides often occur there. Seismic refraction measurement has been aimed at detecting the existence of sliding planes in this area. Hagiwara method was applied for calculating the depth of layers beneath each geophone. The result of the analysis shows that the thickness of the layer which is potential to sliding is about 1.4 m in average consisting of thallus and weathering material of tuffaceous sandstone . Keyword : landslide, seismic refraction, sliding plane

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