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Akasi, Iftita Anugraini
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Investigasi Patahan Manado di Pesisir Teluk Manado Sebagai Upaya Mitigasi Bencana Alam As'ari, As'ari; Tongkukut, Seni Herlina Juita; Panjaitan, Sarmaria; Akasi, Iftita Anugraini; Pulu, Meidy Rosalie
Jurnal MIPA Vol 10, No 1 (2021)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jmuo.10.1.2021.31483

Abstract

Daerah sumber gempa bumi biasanya terdapat pada patahan-patahan yang aktif dan daerah batas lempeng. Data sumber gempa dibutuhkan sebagai bahan evaluasi potensi bencana alam gempa bumi. Sulawesi Utara merupakan daerah yang mempunyai posisi dekat dengan pertemuan tiga lempeng, yaitu Lempeng Pasifik, Lempeng Eurasia dan Lempeng Indo Australia. Patahan Manado merupakan satu patahan yang terdapat di Sulawesi Utara melewati Kota Manado. Keberadaan patahan di pesisir Kota Manado memerlukan identifikasi lebih lanjut menggunakan survei geofisika bawah permukaan. Penelitian bertujuan mengidentifikasi parameter fisis patahan di Pesisir pantai Kota Manado. Eksplorasi dilakukan menggunakan metode geolistrik tahanan jenis konfigurasi dipol-dipol. Data diolah dengan menggunakan perangkat lunak Res2dinv, dan dihasilkan tampang lintang resistivitas 2 dimensi bawah permukaan bumi. Pada lintasan 1 yang terletak di reklamasi pantai, Patahan Manado diidentifikasi sebagai rekahan dengan nilai resistivitas ρ ≤ 20 Ωm, lebar patahan 10-60 m dan kedalaman sampai 20 m. Pada lintasan 2 yang terletak di daratan rekahan dengan nilai resistivitas ≤ 128 Ωm, lebar patahan 10-40 m dan kedalaman sampai 20 m. Rekahan pada lintasan 1 terisi material yang mengandung air laut, sedang rekahan pada lintasan 2 terisi material yang mengandung air tawar. Akuifer air tawar di daratan pesisir pada jalur patahan tidak terintrusi oleh air lautThe source areas for earthquakes are usually at active faults and plate boundary areas. Earthquake source data are needed as material for evaluate the potentiation of earthquake natural disaster. North Sulawesi is an area that has a position close to the meeting point of three plates, namely the Pacific Plate, Eurasian Plate and the Indo-Australian Plate. The Manado Fault is a fault located in North Sulawesi through the city of Manado. The existence of the fault on the coast of Manado City requires further identification using subsurface geophysical surveys. This study aims to identify the physical parameters of the fault on the coast of Manado City. Exploration is carried out using the geoelectric resistivity method of dipole-dipole configuration. The data is processed using Res2dinv software, and the result is a 2-dimensional resistivity cross section of the earth subsurface. On line 1 which is located at beach reclamation, the Manado Fault is identified as a fracture with a resistivity value of ρ ≤ 20 Ωm, a fault width of 10-60 m and a depth of up to 20 m. On line 2 which is located on the fracture land with a resistivity value ρ ≤ 128 Ωm, the fault width is 10-40 m and a depth of up to 20 m. The fracture on track 1 is filled with material containing sea water, while the fracture on line 2 is filled with material containing fresh water. Freshwater aquifers in coastal land on the fault line are not intruded by sea water
Eksplorasi Metode Geolistrik Resistivitas: Studi Kasus Zona Sesar Utama Manado dan Akuifer Air Tanah Di Kabupaten Minahasa Utara As'ari, As'ari; Tongkukut, Seni Herlina Juita; Suoth, Verna Albert; Panjaitan, Sarmaria; Akasi, Iftita Anugraini; Pulu, Meidy Rosalie
Jurnal MIPA Vol 11, No 1 (2022)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jm.v11i1.36103

Abstract

The Manado Fault is a fault located in North Sulawesi which is through the North Minahasa Regency. The fault area is a weak zone that is formed when a crack occurs on the earth's surface, a gap with a certain depth and width is formed, because the natural process of the gap is filled by the surrounding soil material. This weak zone has the potential to become a reservoir for rainwater, which can become a groundwater aquifer. The formation of fractures depends on the geology of an area, fracture characteristics such as the width and depth of the fracture affect the potential for groundwater stored as aquifers. This study aims to identify the influence of geology on the physical parameters of the fault that determine the potential presence of groundwater aquifers in North Minahasa Regency. The faults identified as fractures in Watutumou II Village, Kalawat District and Rap Rap Village, Airmadidi District, North Minahasa Regency are associated with fluids and form groundwater aquifers. The potential for groundwater storage is related to geological conditions following the trend of depth to fracture width with a gradient of -0.0588.