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Iyan Haryanto -, Iyan Haryanto

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STRUKTUR LIPATAN ANJAKAN DAERAH WALAT, SUKABUMI, JAWA BARAT -, Iyan Haryanto; -, Edy Sunardi; -, Adjat Sudradjat; -, Suparka
Bulletin of Scientific Contribution Vol 9, No 1 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Walat hills in the area of Sukabumi, has a pattern of east-west trending ridge. Hills line orientation is controlled by the structure of fold with is followed by formation of reverse fault. Both of geological structures is formed on the same tectonic period, on Plio-Plistocene. Position of the axis of the fold and reverse fault parallel relative to each other, based on the tectonic formation occurs in the same period, it can be classified as a pattern of thrust folds structure. Of some reverse faults that developed in Walat Area, the reverse fault whose position to northward is major reverse fault, so that by referring to the model structure of Boyer and Elliote (1982), it can be classified as a leading thrust system. This structural pattern is controling topographical differences of the hills with plain morphology in northern.

STRUKTUR GEOLOGI PADA ZONA TRANSISI ANTARA BUSUR VOLKANIK BUKIT BARISAN DENGAN CEKUNGAN BELAKANG BUSUR : CONTOH DI DAERAH SUMATRA UTARA -, Iyan Haryanto
Bulletin of Scientific Contribution Vol 9, No 1 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Structural pattern in Sumatra controlled by oblique subduction between Eurasian Plate with Indo-Australian Plate, resulting the structure dominated by strike-slip dextral faults. According to the position of subduction, the strike slip fault generally trending northwest-southeast.The older faults that already formed in the basement rocks (pre-rift) reactivated become normal faults under the influence of transtensional (syn-rift). This tectonic process then produce some tertiary sedimentary basin in the adjacent area. Furthermore, in the Late Tertiary it is reactivated again under the influence of transpressional (post-rift). This later tectonic event cause all sedimentary rock strongly folded and faulted, followed by magmatism/volcanism activity. This whole tectonic activity produced the Barisan Mountain Range.The transpressional process created high and low area, which could make the basement rock uplifted and separate the distribution of tertiary sedimentary in the different locations.

STRUKTUR GEOLOGI PALEOGEN DAN NEOGEN DI JAWA BARAT -, Iyan Haryanto
Bulletin of Scientific Contribution Vol 4, No 1 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Regional Structure in Java influenced by collision between Hindia-Australia plate and Eurasi plate activities. This collision formed mélange rock that now outcropped in Ciletuh, Sukabumi. Beside mélange rock are found, this collision form regional structure of in Java both under and also above surface.Under surface Structure generally expand from southern part of Java continent to Java Sea. This North-south Structure can be classified as Sunda Pattern. Other Regional Structural Geology can be seen on the surface of either direct field perception and also from satellite imagenary, for example Cimandiri fault, Baribius fault and Lembang fault. Cimandiri fault represent Meratus pattern while Baribis fault and lembang fault represent Java pattern.The forming of this three fault pattern also followed by volcanic activities along with continental plates collision activities. The Changes of volcanic belts in are related to the subduction belt changes or the changes of subduction zone angle. These changes also influence regional structural geology in West Java.

TEKTONIK BATUAN PRA-TERSIER JAWA BARAT -, Iyan Haryanto; -, Aldrin Ramadian; -, Faisal Helmi
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The Pre-Tertiary Melange is the oldest rocks outcrop that found in Ciletuh area. Stratigraphically, this mélange is basement rock that overlaid unconformity by Tertiary sedimentary rocks, i.e. Ciletuh and Jampang FormationThe outcropping mechanism of Pre-Tertiary rock in this area due to up-tilting, thrusting and folding that followed by sliding. The product of sliding is represented by a elongate scarp toward the sea..

KONTROL STRUKTUR GEOLOGI TERHADAP SEBARAN BATUBARA DI DAERAH MENUKUNG-NANGAPINOH KALIMANTAN BARAT -, Iyan Haryanto
Bulletin of Scientific Contribution Vol 6, No 2 (2008): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Coal outcrop in Menukung area and Nangapinoh met in Melawi basin. This basin have experienced of several tectonic causes coal seam folded and faulted.Result of measurement entire coal outcrop shown strike between N 240°E – N 315°E with dip between 5° until 10°. Based on contruction result strike pattern known distribution coal in surface with orientation Southwest-Northeast and dip orientation Northwest, North until Northeast.dengan demikian sebaran batubara controlled by homocline fold structure. Based on strike and dip data and kind of geology structure that controlling it, so that known in northern research area have potention good enough.

STRUKTUR SESAR DI PULAU JAWA BAGIAN BARAT BERDASARKAN HASIL INTERPRETASI GEOLOGI -, Iyan Haryanto
Bulletin of Scientific Contribution Vol 11, No 1 (2013): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

There are four major fault lines pattern that developed in Tertiary sedimentary rocks in the Western Part of Java Island, that are the east-west, north-south, northwest-southeast and northeast-southwest. Fault structures with the east-west direction generally existed as a reverse fault and as the main fault patterns that control the distribution of rocks on the surface. Regionally, together with structural folds, these fault structures has formed the thrust fold belt structure. The other faults direction, generally known as the secondary faults that formed simultaneously with the thrust fold belt structure. These faulst are generally as strike slip fault or oblique faults that are transtensional or transpressional. This fault pattern is formed when a horizontal force strength differences in each segment. From the Compilation of the fold structures data, faults and the stratigraphy, it can be concluded that the geological structure developed in Tertiary sedimentary rocks in the western part of Java Island, began formed at late Tertiary, under the main compressional system, which is north-south trending.

GEOLOGI DAN ANALISIS TEKTONIK DAERAH KAMPAR SUMATRA TENGAH -, Faizal Muhamadsyah; -, Iyan Haryanto
Bulletin of Scientific Contribution Vol 6, No 2 (2008): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Central Sumatera basin controlled by an amount of regional stike-slip fault (wrench fault) moving on transtensinal system. Overall srike-slip pattern forming as negative flower structure, yielding horst and garben. This tecotonic process happened in Early Miocene.Graben forming begin the sedimentation process which indicate the coarse clastica deposit existence that goes on fluvial environment. This deposit equivalent with Sihapas formation that have an age of Eosen. The Sedimentary basin had a subsidence continuously till Middle of Miocene, that indicated by developt marine sedimentary rock.In Plio-Pleistocene, the uplifting processes is happen again that cause forming of fold and fault structure. Tectonic compression cause the research area more shallow and then become a continent. This is indicated by developted conglomerate, sandy conglomerate, tuffaceous sandstone which forming in continent.

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.

GEOLOGI DAN POTENSI BAHAN GALIAN BIJIH BESI DAERAH ACEH BARAT DAYA -, Iyan Haryanto
Bulletin of Scientific Contribution Vol 5, No 3 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The geology of the Aceh Baratdaya has been controlled by convergence of the Eurasian and Indian lithospheric plates since the Mesozoic era. Various types of rock—including the metamorphic, meta-sedimentary, volcanic, and plutonic rocks—and the associated economic mineral deposits have been formed by diverse geologic proceses (i.e., sedimentation, lithification, metamorphosis, crystallization, and structural processes) associated with convergent plate interactions.The magnetic iron ores in the study area are interpreted as the crystallization product of hydrothermal solutions. Genetically, the iron ore in the study area is of lateritic type. Most of the ores in the study area are spread in northwest-southeast direction, in harmony with the general trend of faults and folds.

Co-Authors Adjat Sudradjat -, Adjat Sudradjat Aldrin Ramadian -, Aldrin Ramadian Edy Sunardi Faisal Helmi -, Faisal Helmi Faizal Muhamadsyah -, Faizal Muhamadsyah Ismawan - Oeke Sobarin -, Oeke Sobarin Suparka -, Suparka Yunita Rossa Indah Putri, Yunita Rossa Zufialdi Zakaria -, Zufialdi Zakaria

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