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All Journal Physics Student Journal INDONESIAN JOURNAL OF APPLIED PHYSICS
Fina Fitriah
Brawijaya University
Astronomy Energy Materials Science & Nanotechnology Physics

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ANALISIS DAERAH RAWAN LONGSOR DI DUSUN PLETES/KRAJAN, KECAMATAN SUMBERMANJING WETAN, MALANG DENGAN METODE GEOLISTRIK RESISTIVITAS BERDASARKAN MODEL SCORING PARAMETER Fitriah, Fina; -, Wasis; -, Sunaryo
Physics Student Journal Vol 2, No 1 (2014)
Publisher : Department of Physics - Faculty of Science

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Abstract

Tanah longsor adalah peristiwa runtuhnya bebatuan atau gumpalan tanah akibat ketidakseimbangan geometri. Dusun Pletes/Krajan terletak di 0801534,41"–0801537,32"S dan 11204049,34"–11204050,00"E dan ketinggian 576–612 meter. Dusun Pletes/Krajan adalah lokasi tanah longsor pada tanggal 25 Januari 2013, sehingga memungkinkan terjadinya longsor kembali di sekitar lokasi kejadian. Salah satu metode geofisika yang dapat digunakan untuk menganalisis potensi longsor menggunakan metode geolistrik resistivititas dengan konfigurasi wenner alpha. Metode ini digunakan untuk menentukan litologi bawah permukaan dan pendugaan bidang gelincir longsor. Berdasarkan data geolistrik yang diperoleh, diketahui bahwa litologi bawah permukaan Dusun Pletes terdiri atas sisipan batu lempung basah (1.18Ωm–6.61Ωm), sisipan batu lempung kering (>6.61Ωm–88.2Ωm) dan batu gamping (>88.2Ωm–496Ωm). Bidang gelincir longsor ditemukan dalam bentuk batu gamping mulai kedalaman 3,88 meter–21,5 meter. Berdasarkan analisis dari daerah rawan longsor Dusun Pletes/Krajan beresiko tinggi. Kata Kunci: metode geolistrik resistivitas , Pletes , tanah longsor, wenner alpha.
Identification of Cracked Zone in Sutami dam Using Geoelectrical Method Fitriah, Fina; S, Sunaryo; Susilo, Adi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 5, No 02 (2015): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v5i02.294

Abstract

We identified the craked zones based on geoelectrical resistivity method in Sutami Dam. There are four lines measurement of geoelectrical resistivity method with a length of 380-400 meters. The direction of each line is from the northeast to the southwest. All of the tracks are located at the top of Sutami Dam i.e. two tracks in the upstream and the others in the downstream. From the analysis we found that the lithology is detected by geoelectrical resistivty method showed two layers of design of Sutami Dam. The two layers that are detected are transition zone and filter zone. Transition zone consists of sandstone rock containing water (0.922 Ωm-9.57 Ωm) and dry sandstone (>9.57 Ωm-320 Ωm). Filter zone consists of sand (>320 Ωm-4410 Ωm). Cracked zones spread in the upstream, downstream, and roadway at the top of Sutami Dam which are indicated by the presence of low resistivity (0.922 Ωm-9.57 Ωm) based on 3D processing of data of geoelectrical resistivity. The distribution of cracked zone indicates that Sutami Dam is susceptible to ground movement.
Co-Authors Adi Susilo Sunaryo - Sunaryo S, Sunaryo Wasis -