Agus Hendratno
Staf Pengajar Jurusan Teknik Geologi UGM, Yogyakarta

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Identifikasi Gunung Api Purba Karangtengah di Pegunungan Selatan, Wonogiri, Jawa Tengah Abdissalam, Rus; Bronto, Sutikno; Harijoko, Agung; Hendratno, Agus
Indonesian Journal on Geoscience Vol 4, No 4 (2009)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2041.022 KB) | DOI: 10.17014/ijog.v4i4.85

Abstract

DOI: 10.17014/ijog.v4i4.85Karangtengah area in the southeastern part of Wonogiri Regency, is part of the Southern Mountains which is wholly composed of Tertiary volcanic rocks. Nevertheless, the eruptive centre of these volcanic rocks is still unknown. Based on an integrated study that comprises geomorphology, stratigraphy, structural geology, petrology, alteration, and mineralisation the existence of Karangtengah paleovolcano can be identified. The paleovolcano was formed below sea water, basaltic in composition, and it was part of a volcanic island arc during the time. Volcanogenic minerals are found in the central facies containing Fe, Cu, Pb, and Zn.
SELECTING RELOCATION OF LAND USE IN HOT MUD DISASTER AREA BY APPLYING GEO-ENVIRONMENTAL EVALUATION. CASE STUDY: SIDOARJO, EAST JAVA, INDONESIA Eka Putra, Doni Prakasa; Syauqi, Syauqi; Juwarso, Juwarso; Hendratno, Agus; Wibowo, Handoko Teguh
Journal of Applied Geology Vol 2, No 3 (2010)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3476.471 KB) | DOI: 10.22146/jag.7273

Abstract

Since May 29, 2006, a sea of hot mud has been gushing from the ground in Sidoarjo, East Java, 35 kilometers south of Indonesia’s second largest city, Surabaya. Due to this disaster, approximately thousand of people have been forced from their homes because 600 ha of land and villages were submerged, farmland was ruined, businesses and schools closed as the mud inundated the surrounding area. Relocation of the land uses and supporting infrastructures are become important to support the human survivability and environmental sustainability in this disaster area. In order to select the suitable location for land uses and infrastructures, aspect of environmental geology must be concerned. Geo-Environmental parameters such as geological hazards and geological resources are used to select the suitable relocation area. Evaluation of the suitable land uses is conducted by applying simple overlay rating method. Result of this evaluation shows that the relocation of the land uses can be differentiated into three categories; (i) high risk land use/infrastructure, moderate risk land use/infrastructure and low risk land use/infrastructure. Each of these categories have difference map of relocation suitability, however all maps indicate that the suitable relocation area is in the west-part from the hot mud disaster area. Keywords: Hot mud blast, relocation of land uses, geo-environmental evaluation
Geological spatial plan toward groundwater resources in Kertek, Wonosobo Basin, Central Java, Indonesia Daryono, Lutfian Rusdi; Wijayaningsih, Melania Seta Dhesty; Hendratno, Agus; Nukman, Mochamad; Hartantyo, Eddy; Kawasaki, Satoru
Journal of Degraded and Mining Lands Management Vol 6, No 2 (2019)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (20.784 KB) | DOI: 10.15243/jdmlm.2019.062.1595

Abstract

Human activity affects both natural resources and spatial land use, including its utilization as sand mining sites. Sand mines, as a pillar of building construction, have been over excavated in certain areas, which has impacted the environment. In this research, the purpose of this study was to determine a spatial allocation of the mining designation area that will not damage the groundwater flow. Therefore, it is imperative for understanding the depth of groundwater at the study site, understanding the direction of groundwater flow, and the impact of mining activities on groundwater based on the combination of geophysical and geological approaches to improve the current government policy. A geological-geophysics approach, vertical electrical sounding (VES), was followed at 12 different locations surrounding the Kertek District, which has a general geological formation of igneous volcanic rock sediment. The result of the geophysical measurements (possibilities) indicates the presence of shallow, medium, and deep groundwater aquifers, which tended to follow the slope direction to the south. This may be due to the unsaturated soil conditions as the geoelectrical measurements were taken at the beginning of the rainy season. Finally, the goals of this research were to integrate resources with spatial characteristics to allow proper resources management.