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Asmoro Widagdo
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Kontrol Struktur Pada Longsor di Daerah Sampang-Karangkobar Kabupaten Banjarnegara Jawa Tengah Asmoro Widagdo; Rachmad Setijadi
Dinamika Rekayasa Vol 11, No 2 (2015): Jurnal Ilmiah Dinamika Rekayasa - Agustus 2015
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2015.11.2.74

Abstract

Bencana longsor merupakan ancaman bagi masyarakat di daerah pegunungan di seluruh Indonesia. Bencana ini terjadi karena berbagai faktor penyebab. Masalah yang di kaji dalam penelitian ini adalah mengetahui kelurusan struktur, morfologi dan batuan daerah longsor Sampang-Karangkobar. Kompleksitas struktur terterntu, morfologi yang terjal dan litologi tertentu dapat menjadi pemicu bagi fenomena longsor. Metode penelitian dilakukan dengan pengamatan lapangan dan analisis kelurusan peta. Pengamatan morfologi dan kelerengan topografi dilakukan di peta dan di lapangan. Daerah Sampang-Karangkobar tersusun atas batulempung dengan sisipan pasir karbonatan sebagai batuan yang tertua dan juga tersusun atas breksi sebagai batuan yang lebih muda. Batulempung merupakan batuan yang mudah tererosi. Pengikisan batulempung tua di bagian bawah menyebabkan labilnya masa breksi diatasnya. Daerah penelitian merupakan zona pertemuan kelurusan struktur geologi yang mengenai batulempung dan breksi yang memiliki morfologi terjal. 
Geomorfologi Sungai Klawing Daerah Bobotsari, Kabupaten Purbalinggga, Jawa Tengah Asmoro Widagdo
Dinamika Rekayasa Vol 8, No 2 (2012): Dinamika Rekayasa - Agustus 2012
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2012.8.2.105

Abstract

Klawing watershed is in Banyumas basin area, Purbalingga, Central Java. The river's flow is cut Tertiary rocks in the mountains of North Serayu, which includes Halang Formation, Kumbang, and Tapak and also Quaternary volcanic rocks of Slamet Volcano. The morphology of the surrounding area of the river is a volcanic mountains of Slamet Volcano in the western, homocline mountainous in the north and the hills / plains in the east and south. Geomorphological processes of Klawing River has formed alluvial deposition and the plain around the river. Alluvial deposits form the terrace around the Klawing River. At least three terrace rivers developed around the study area. The three terrace rivers are each up to elevations of 2.9 m, 22.9 m and 34.9 m from the surface of the Recent river.
Potensi Sumberdaya Batubara di Daerah Petak Malai, Kabupaten Katingan, Provinsi Kalimantan Tengah Asmoro Widagdo; Adi Candra
Dinamika Rekayasa Vol 9, No 2 (2013): Jurnal Ilmiah Dinamika Rekayasa - Agustus 2013
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2013.9.2.64

Abstract

Administratively, research area ( 9.930 Ha) is located at Petak Malai District, Katingan Regency, Central Kalimantan Province. This research is aimed to know the coal outcrop position, the number of coal seam and to measure of coal resources. The research is done by geological mapping of coal and other lithology at the field. The next phase is correlate some of coal outcrop and make a geological map. The last phase is calculating measured resource and indicated resource of all coal seams.There are ten of coal outcrops in the research area. The ten coal outcrop can be correlate and it becomes three coal seams which have 0.13 m to >0.7 m thick. This coal outcrop is found at Claystone-Sandstone Unit of Dahor Formationwhich lies at central part of the research area. Measured resource of coal resources calculation of research area is 873,050.1 ton. Indicated resource of this research area is 4,524,346 ton.Geological structure formed in the study area is fold and joint. The fold axis is relatively north-south trend. Anticline and syncline fold are the main control of the coal spread.
Potensi Batuan Induk Batu Serpih dan Batu Lempung di Daerah Watukumpul Pemalang Jawa Tengah Sachrul Iswahyudi; Asmoro Widagdo
Dinamika Rekayasa Vol 5, No 1 (2009): Dinamika Rekayasa - Februari 2009
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2009.5.1.17

Abstract

Shale and claystone of Watukumpul Area have capability to become the source rock of hydrocarbon because of the ability to conserve the organic material better. Potential of the rock become source rock is depend on its maturity and total organic carbon.This research test eight example of rock to analysis their total organic carbon (TOC) and rock eval pyrolisis. Only one sample is claystone, while the seven others are shales. The analyses provide data of total organic carbon, hydrogen index, and vitrinite reflectances which was used to interpret source rock potential of research area.Through this research is known that the organic material content of shale and claystone of research area own the fair level of total organic carbon. Organic material is included Kerogen Type III with the origin of land organism or plant.These kerogens of research area prefer to produce gas or gas prone. Organic material or kerogens have reached the matured phase to generate hydrocarbon (mature level). Special follow the rock sample came from Location 8 which have over mature level. Its high maturity is suspect have relationship with the intrusion of diorite igneous rock in this research area. Further research is needed to investigate the relationship between diorite intrusion and organic material in this research area.
Co-Authors Candra, Adi Rachmad Setijadi Sachrul Iswahyudi