ANALISIS JALUR SESAR LOKAL SEGMEN UTARA-SELATAN MENGGUNAKAN METODE MAGNETIK DI DESA DLEPIH KECAMATAN TIRTOMOYO WONOGIRI

Dea Mutiara Jannah, NIM.: 21106020036 (2025) ANALISIS JALUR SESAR LOKAL SEGMEN UTARA-SELATAN MENGGUNAKAN METODE MAGNETIK DI DESA DLEPIH KECAMATAN TIRTOMOYO WONOGIRI. Skripsi thesis, UIN SUNAN KALIJAGA YOGYAKARTA.

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Abstract

The local fault line in Dlepih Village, Tirtomoyo District, Wonogiri Regency is the focus of this research. The aim of this research is to analyze the distribution pattern of magnetic anomalies, analyze subsurface lithology, and analyze local fault lines based on 2-dimensional modeling in the research area. The field data acquisition process in this research was carried out at 57 measurement points spread over 3 rock formations, namely the Nglanggran Formation, Semilir Formation, and Dasit. Measuring the magnetic field value at these points uses a tool called a Proton Precession Magnetometer (PPM). The total magnetic field data obtained from the tool is then subjected to several corrections, namely daily variation correction and IGRF correction. After correction is carried out, the magnetic field anomaly value will be obtained. The magnetic field anomaly values in the study area range between -232,3 nT to 730,6 nT, where the high cover is distributed in the Nglanggran Formation area which is predominantly composed of Igneous Rock. Cutting into the residual anomaly data, several magnetic susceptibility values were obtained, namely 0,12×10-3 (SI) to 1,11×10-3 (SI) which is sandstone, 20,85×10-3 (SI) up t. 44,62×10-3 (SI) which is Andesite breccia, and 3,66×10-3 (SI) to 6,67×10-3 (SI) which is Dacite Stone. The results of model analysis show that there is a fault that trends North-South (N7ºNE), this fault is a type of strike-slip fault

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