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All Journal JIPF (Jurnal Ilmu Pendidikan Fisika) KURVATEK Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII
Obrin Trianda
Institut Teknologi Nasional Yogyakarta
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation

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Identification of Slip Surfaces Using the Geoelectric Imaging Method in the Kalirejo Area, Kokap District, Yogyakarta, Indonesia Rizqi Prastowo; Hurien Helmi; Obrin Trianda; Rofiqul Umam
JIPF (Jurnal Ilmu Pendidikan Fisika) Vol 6, No 3 (2021): September 2021
Publisher : STKIP Singkawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26737/jipf.v6i3.2072

Abstract

Landslides are a significant threat to the environment, infrastructure, and human activity, especially in mountainous and hilly areas. It is, therefore, important to accurately identify the social movements that trigger these processes. The resistivity method can investigate subsurface geological variations, including the potential for landslides. This research was conducted to investigate the subsurface structures in the Kalirejo Village area, Kokap District, Kulon Progo Regency, Yogyakarta regarding identifying the sliding location. This investigation includes five lines of tomographic geoelectric measurements. The results show that the slips surface is at a depth of about 5-10 m with a high resistivity value and the landslide material is weathered soil, and the slip surface is andesite. The resistivity of andesite in range 668-1600 Ωm. The landslide material's thickness is around 5-8 m with resistivity in the range 4,01-22.1 Ωm. Landslide material is water-saturated soil.
KAJIAN GEOLOGI UNTUK MENENTUKAN AIR TANAH DAERAH SAMBIREJO, KECAMATAN PRAMBANAN, KABUPATEN SLEMAN, YOGYAKARTA Obrin Trianda; SITI NUR'AINI
KURVATEK Vol 6 No 1 (2021): April 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i1.2092

Abstract

Sambirejo area (Prambanan Sub-District, Sleman District) is known as a water-scarcity area. The morphology shows as a hilly slope with is arranged by three lithology unit such as Semilir Formation (tuff sandstone and pumice breccia), Nglanggeran Formation (pyroclastic breccia) and alluvial unit. By having increasing number of population will be followed by fresh water needs of citizen, it will cause water-scarcity problems. Three aspects that controlling the fresh water availability in one area are morphology, lithology type and the depth of water table.The objective of this study is to investigate fresh-water resources in Sambirejo area. The problem arises is how to identify the good quality of water resource and also could be beneficial to fulfill the citizen’s water needs. Subsurface water management is still need to be conducted to gain the maximum water resources and soon after could be used directly by the citizen. The method of study firstly is geological mapping with the purpose of to identify the lithology distribution. Then the second is geo-electric resistivity to determine the fresh-water resources.Sambirejo area is known as a scare-water area due to the lithology composition such as breccia and tuff which is situated to the slope and ridge morphology. Water table presents at the depth between 20 to 40 meter is known as shallow aquifer whereas at the depth of 98 to 142 meter is categorized as almost deep aquifer. The typical of Sambirejo’s aquifer develops as a leaky unconfined aquifer where the lowest part of pumice breccia lithology is located impermeable tuff rock. Keywords: aquifer, lithology, fresh-water, Sambirejo
ANALISIS KETERDAPATAN MINERAL EKONOMIS DENGAN METODE LINEANMENT DENSITY DISEKITAR KECAMATAN PANGKALAN JAMBU, KABUPATEN MERANGIN, PROVINSI JAMBI. MAULANA DIMAS KIRANA; HURIEN HELMI; OBRIN TRIANDA
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

One area that is famous for the existence of gold mines owned by the people in Jambi Province is in Merangin Regency, more precisely around Pangkalan Jambu District. The presence of gold mines around the research area indicates the result of hydrothermal alteration in the form of gold deposits. The use of geographic information systems aims to determine the location of the lineament density zone which is estimated to be the source of hydrothermal alteration. The purpose of this study is to model lineament density by utilizing secondary data in the form of DEM data which is added with hillshade to extract lineaments, then combined with structure on lineaments based on Regional Geological Maps. The results showed that high and medium density zones were located in areas associated with fault zones, which is one of the strong factors for the presence of alteration in areas that have a strong structural density or crushed zone. It is known that the majority of mines are in the medium-low density zone close to the river flow, this can happen because the river passes through several density zones at once can be used as a transportation medium for materials that have experienced erosion so that they can be deposited in areas that are currently under water. mine. It is known that there is potential for alteration in 2 zones of medium and high density, each having an estimated area of ​​4130.50 Ha in the high density zone and 49557.53 Ha in the medium density zone.
IDENTIFIKASI KAWASAN RAWAN BENCANA LONGSOR METODE SKORING DAERAH MOJOTENGAH DAN SEKITARNYA, KECAMATAN REBAN, KABUPATEN BATANG, PROVINSI JAWA TENGAH reza_krisnandi reza krisnandi; Obrin Trianda; Al Hussein Flowers Rizqi
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Administratively the research area is included in the Dieng Volcano Complex which consists of several volcanoes that have slopes steep. The steep slope is one of the main occurrences of landslide movements. Determination of landslide-prone areas using a scoring method with GIS software with parameters such as slope, rock type, soil type class, rainfall, and land use. Based on these 5 parameters, the research area is divided into 3 low landslide-prone areas with a value of 33.00-52.00 with an area of ​​24.19% of the research area which is generally spread out in the northern part of the research area occupying areas with relatively gentler slopes. Areas prone to moderate landslides with a value of 52.01-61.00 with an area of ​​28.91% of the research area which are generally spread out in the middle of the research area occupy areas with relatively steep slopes. Areas prone to landslides are high with a value of 61.01-80.00 with an area of ​​46.90% of the research area which is generally spread in the uthern part of the researh area occupying areas with steep-very steep slopes. Keywords: Disaster, Vulnerability, Landslide, Mojotengah.
Co-Authors Al Hussein Flowers Rizqi Hurien Helmi MAULANA DIMAS KIRANA reza_krisnandi reza krisnandi Rizqi Prastowo SITI NUR'AINI Umam, Rofiqul