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All Journal IJOG : Indonesian Journal on Geoscience JURNAL BIOLOGI INDONESIA Jurnal Geologi dan Sumberdaya Mineral
Indyo Pratomo
Pusat Survei Geologi, Jln. Diponegoro No. 57 Bandung
Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Mekanisme erupsi ignimbrit Kaldera Maninjau, Sumatera Barat Pribadi, Agung; Mulyadi, Eddy; Pratomo, Indyo
Indonesian Journal on Geoscience Vol 2, No 1 (2007)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (823.541 KB) | DOI: 10.17014/ijog.v2i1.26

Abstract

http://dx.doi.org/10.17014/ijog.vol2no1.20073Maninjau is a large collapsed caldera that was resulted from a large eruption of silicic pyroclastic material (220-250 km3), and was distributed to more than 75 km away from the source. Field observations have provided a good understanding to the eruptive mechanism of the Maninjau caldera formation, in respect to their stratigraphy, sedimentology and geochronology of the eruptive products. Two formations have been identifi ed, those are: the Maninjau Formation, comprising a sequence of ignimbrite and surge units erupted from the Maninjau Caldera, and the Malalak Formation as a prominent andesitic fall unit likely derived from the Singgalang - Tandikat Volcano that overlies the Maninjau Formation. The variable velocity of the fl ows suggests that the Maninjau eruption initiated by violent. The later phases of the eruption became more violent and associated with caldera collapse.  
Gerakan struktur dan kaitannya dengan faktor kendali tektonik, berdasarkan analisis stratigrafi; Studi kasus geologi kuarter terhadap fase perkembangan Danau Tondano purba sepanjang Remboken - Kakas, Kec. Remboken dan Kec. Kakas, Kab. Tomohon, Sulawesi Ut Moechtar, Herman; Pratomo, Indyo; Mulyana, Herman; Poedjoprajitno, Soemantri
Indonesian Journal on Geoscience Vol 2, No 3 (2007)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1935.254 KB) | DOI: 10.17014/ijog.v2i3.37

Abstract

http://dx.doi.org/10.17014/ijog.vol2no3.20075Studies of stratigraphy on Quaternary deposits in the southwest region of Lake Tondano, Tomohon Regency, South Sulawesi, revealed six facies of deposition environments. These facies consist of Tondano tuff, young volcanic eruption, lake, sand lake, tidal lake, and swamp deposits. Based on the correlation of the lateral and vertical variation of the Quaternary deposits, three unit of the depositional facies were recognized (UFP I-III). Each of the depositional facies unit is characterized by variation of the depositional environment changes which were controlled by tectonics, and was followed by the activity of Sonder main fault. The Sonder main fault activity, which controlled the depositional environment changes was recorded as an UFP. Probably, the character of this stratigraphy could be called as cyclo-tectonostratigraphy. The study was based on analyses of sedimentology and stratigraphy of six borehole information obtained along the E-NW traverse which is approximately parallel to the shorelines of the southwestern part of Lake Tondano. The penetration of the borehead varied from 1.20 to 8.7 m.  
Klasifikasi gunung api aktif Indonesia, studi kasus dari beberapa letusan gunung api dalam sejarah Pratomo, Indyo
Indonesian Journal on Geoscience Vol 1, No 4 (2006)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (710.239 KB) | DOI: 10.17014/ijog.v1i4.23

Abstract

http://dx.doi.org/10.17014/ijog.vol1no4.20065Indonesia is well known as a volcanic country, where more than 30% out of all the world volcanoes occupied this region. Volcanic region is generally densely populated, because of their soil fertility and other land use. Based on their historical eruptions noted since and before 1600 A.D., the Indonesian active volcanoes are regrouped in to A type (79 volcanoes), which were defi ned as volcanoes erupted since 1600 A.D., B type (29 volcanoes) erupted before 1600 A.D., and C type (21 volcanoes) are solfatar fi elds (Bemmelen, 1949; van Padang 1951; Kusumadinata, 1979). Studies on parts of the Indonesian active volcanoes, show different eruptive characters, which are generally related to hazard potentials. A new classifi cation of Indonesian active volcanoes was proposed based on the combination of their physical properties, morphology, volcanic structure and eruptive styles to the eight differents types, those are Tambora (caldera formation), Merapi (lava dome), Agung (open crater), Papandayan (sector failure), Batur (post-caldera activities), Sangeangapi (lava fl ows) and Anak Krakatau types (volcano islands and submarine volcano). This classification would be make a better understanding to different characteristics of Indonesian active volcanoes, for the volcanic hazard and mitigation and also for the applied volcanological researches.  
Potensi Bencana Alam Gempa Bumi dan Gerakan Tanah, di Kawasan Taman Nasional Gunung Ciremai dan Sekitarnya Djaja, Djaja; Pratomo, Indyo
JURNAL BIOLOGI INDONESIA Vol 5, No 3 (2009): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v5i3.3186

Abstract

ABSTRACTThe natural dissarter and Land Slide at Ciremai Mountain National Park. Kuningan region,West Java, has relatively highly potential on the seismic and land slide hazards. This region issituated on the active tectonics, deep slopes and generally composed by volcanic sediments ofCiremai volcano. All of those factors are, even more, situated on the annually high rainfallregion. The fractures and deformation of the soil and landforms triggered by the earthquakesalso an important factor facilitate the land slides.Keyword: Kuningan, West Java, seismic hazard, earthquake,land slide hazard
Kegiatan Gunungapi Ciremai Jawa Barat dan Pengaruhnya Terhadap Lingkungan di Sekitarnya Pratomo, Indyo
JURNAL BIOLOGI INDONESIA Vol 4, No 5 (2008): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v4i5.3212

Abstract

ABSTRACTThe Activity of Ciremai Mountain and The Impact Eruption at the SurroundingArea The Ciremai Mountain is one of the active mountain in West Jawa, the last eruptionwas detected between June 1937 to 7 January 1938, it has respite period for 3-112 years.The potential threatening of the eruption was detected by the pirolastica, the rain dustand ballistic explosion, the current and sliding of lava. The complete history of CiremaiMountain and the dangerous area by eruption were discussed hereKeywords: Ciremai, activity, eruption
Identifikasi Objek Bawah Permukaan Menggunakan Metode Ground Penetrating Radar di Kompleks Candi Kedaton, Muarojambi, Indonesia Sugiarto, Bambang; Lucki Junursyah, G.M; Pratomo, Indyo
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 4 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (483.905 KB)

Abstract

Ground Penetrating Radar (GPR) survey using 200 MHz frequency antenna have been conducted in July 2011 at Kedaton Temple Complex, Muarojambi, Jambi, Indonesia. The survey is aimed at providing subsurface information without digging (excavation) as in usual  conventional archaeological methods. The data were collected on six lines around the main building and a courtyard inside the boundary fence of Kedaton Temple Complex. Good quality data were obtained with signal to noise ratio greater than 110 dB. The result of the subsurface model based on the electromagnetic properties of rocks generating three layers of soil, from the youngest are Layer A with a thickness of 0.26 meters to 0.78 meters, Layer B with a thickness up to 1.51 meters, and Layer C coveringthe indication of archaeological object with a thickness of 0.35 meters up to 3.87 meters. The southern part of the main building showsa delineation and spread of thick layers of soil with a total thickness up to 4.50 meters, while the northern part of ancillary buildings shows a delineation and thin layers of soil with a total thickness only 2.60 meters. The indication of archaeological objects in the sub-surface indicated by the presence of anomalous heights which has a depth varying from 1.65 meters to 4.50 meters. This is interpreted to be a sub-surface anomaly that is likely to be archaeological objects still buried. The archaeological object may represent an ancient building in the zone of depression that accumulates due to the great floods, tidal Batanghari River, and sea level fluctuation in the past.Keywords: Archaeology, geophysics, Ground Penetrating Radar (GPR), Kedaton, Muarojambi.
POTENSI BENCANA ALAM GEMPA BUMI DAN GERAKAN TANAH, DI KAWASAN TAMAN NASIONAL GUNUNG CIREMAI DAN SEKITARNYA Djaja, Djaja; Pratomo, Indyo
JURNAL BIOLOGI INDONESIA Vol 5, No 3 (2009): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v5i3.3186

Abstract

ABSTRACTThe natural dissarter and Land Slide at Ciremai Mountain National Park. Kuningan region,West Java, has relatively highly potential on the seismic and land slide hazards. This region issituated on the active tectonics, deep slopes and generally composed by volcanic sediments ofCiremai volcano. All of those factors are, even more, situated on the annually high rainfallregion. The fractures and deformation of the soil and landforms triggered by the earthquakesalso an important factor facilitate the land slides.Keyword: Kuningan, West Java, seismic hazard, earthquake,land slide hazard
KEGIATAN GUNUNGAPI CIREMAI JAWA BARAT DAN PENGARUHNYA TERHADAP LINGKUNGAN DI SEKITARNYA Pratomo, Indyo
JURNAL BIOLOGI INDONESIA Vol 4, No 5 (2008): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v4i5.3212

Abstract

ABSTRACTThe Activity of Ciremai Mountain and The Impact Eruption at the SurroundingArea The Ciremai Mountain is one of the active mountain in West Jawa, the last eruptionwas detected between June 1937 to 7 January 1938, it has respite period for 3-112 years.The potential threatening of the eruption was detected by the pirolastica, the rain dustand ballistic explosion, the current and sliding of lava. The complete history of CiremaiMountain and the dangerous area by eruption were discussed hereKeywords: Ciremai, activity, eruption
Co-Authors Agung Pribadi Bambang Sugiarto Djaja, Djaja Djaja, Djaja Eddy Mulyadi Herman Moechtar Herman Mulyana Lucki Junursyah, G.M Soemantri Poedjoprajitno