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Journal : Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement)

Penentuan Zona Kerentanan Longsor Berdasarkan Karakteristik Geologi dan Alterasi Batuan Titisari, Anastasia Dewi; Khul Husna, Hitznaiti Zaidini'; Putra, Ilham Dharmawan; Indrawan, I Gde Budi
Jurnal Pengabdian kepada Masyarakat (Indonesian Journal of Community Engagement) Vol 4, No 2 (2019): Maret
Publisher : Direktorat Pengabdian kepada Masyarakat Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4064.51 KB) | DOI: 10.22146/jpkm.35935

Abstract

ABSTRACT Landslide is one of the most frequent disasters in Indonesia. The occurrence of landslides is heavily controlled by geological conditions especially in areas with composed by altered rocks. Hargotirto Village, Kokap District, Kulon Progo Regency, DIY is composed by altered rocks so that many landslides occur.It is necessary, thereforeto determine the landslide susceptibility zone based on the geological characteristics and rock alteration in the area as one of disaster mitigation efforts to reduce the risk of landslide disaster. The research method used is data collection in the field such as inclination data of slope, geological condition, and land cover; and laboratory analysis such as petrographic analysis, XRD (X-Ray Diffraction) analysis, and rock geochemical analysis using ICP-AES (Inductively Coupled Plasma - Atomic Emission Spectroscopy).The collected data are used as parameters for landslide zonation determination using Analytical Hierarchy Process (AHP) method.The results showed that the lithology of the research area is andesite and porphyry diorite with alteration type of argillic and propylitic alteration. Their intensity are categorized as low to moderate alteration.Based on these conditions can be categorized into4 levels of landslide susceptibility namely the very high landslide susceptibility that dominates 35% of research areas in the north and northwest; the high landslide susceptibility of 20% spreads over the center of the study area; the moderate landslide susceptibility of 20% distributed in the center southernof the study area; and the low landslide susceptibility of 25% spread over the southern part of the study area.Therefore, residents who live in the area are advised to always be alert to the possibility of landslide because it is included in the zone of very high and high landslide susceptibility. Keywords: argillic alteration; Hargotirto; landslide susceptibility; prophyllitic alteration
Rekomendasi Pemanfaatan Marmer Daerah Besole, Kecamatan Besuki, Kabupaten Tulungagung, Provinsi Jawa Timur Berdasarkan Karakteristiknya Kurniawati, Selma; Titisari, Anastasia Dewi
Jurnal Pengabdian kepada Masyarakat (Indonesian Journal of Community Engagement) Vol 5, No 2 (2019): Agustus
Publisher : Direktorat Pengabdian kepada Masyarakat Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1110.325 KB) | DOI: 10.22146/jpkm.35963

Abstract

Besole area, Tulungagung regency, East Java province is an area with measured marble resource potential of 15 million tons. This study aims to determine marble recommendations based on their characteristics. Marble characteristic has brownish white-brown description of megascopis, non-foliated structure, based on fracture density measurement using inventory method, marble has medium density, based on petrographic analysis, marble has crystal size ≤ 0.5 - 2 mm, having texture of metamorphism process resistance ie crystalloblastic and relict, texture of mineral form that is granoblastic, texture of metamorphic rock is decussate and saccharoidal. The composition of marble consists of calcite, dolomite and hematite. Based on analysis of geochemical test using method of ICP-AES (Inductively Coupled Plasma - Atomic Emission Spectroscopy), marble has the main oxide content dominated by CaO 54.6% - 56%, based on the analysis of engineering test yields the average value of compressive strength test of 781,713 kg / cm², wear resistance value 0.0399 mm / min and water absorption value 0.704%. The recommended use of marble based on solid density is utilized as a residential floor with a size of ≤10-40 cm, based on its geochemistry used as paper industry, textile dye, pesticide production, sugar screening and cement production, and based on its technique is used as floor with live load> 250 kg / cm², inner and outer construction stone, and light - medium construction foundation