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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS
Fida, Fachri Almawali Abil
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Astronomy Energy Materials Science & Nanotechnology Physics

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Application of Very Low Frequency (VLF) Method for Underground River Estimation in Donorojo Sub-District, Pacitan Bahri, Ayi Syaeful; Rochmah, Khusnul Nur; Fajar, M. Haris Miftakhul; Rochman, Juan Pandu Gya Nur; Lestari, Wien; Fida, Fachri Almawali Abil
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 14, No 2 (2024): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v14i2.83171

Abstract

Pacitan is included in the Gunung Sewu karst area in the Southern Mountain Zone, and carbonate rocks dominate the constituent rocks. Karst has a unique drainage system because it is dominated by subsurface flow. This research was conducted in Cemeng and Klepu villages, Donorojo sub-district, Pacitan, with 4 track data. Data were collected using the very low frequency electromagnetic (VLF-EM) method with a track length ranging from 200-450 m, a measurement spacing of 5 m, and a transmitter frequency of 19.8 kHz. Data processing uses filtering and inversion, resulting in a cross-section of resistivity values. Based on the subsurface resistivity cross-section profile, the cavity in the carbonate rock layer with a resistivity value of 0-500 Ωm is identified as an underground river. The underground river is found on tracks 1, 2, 3, and 4 near the surface, with a depth of about 30 m below the surface.
Co-Authors Bahri, Ayi Syaeful Fajar, M. Haris Miftakhul Juan Pandu Gya Nur Rochman Lestari, Wien Rochmah, Khusnul Nur