Identifikasi Sesar di Segmen Baribis Jawa Barat dengan Metode Magnetotelurik

Naufal, Muhammad Zidan (2025) Identifikasi Sesar di Segmen Baribis Jawa Barat dengan Metode Magnetotelurik. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Segmen Sesar Baribis merupakan salah satu bagian West Java Back Arc Thrust (WJBT) yang membentang dari Cirebon hingga Majalengka dengan panjang sekitar 14 km. Segmen ini menunjukkan aktivitas tektonik yang signifikan dengan dibuktikan terdapat dua gempa dangkal dengan magnitudo 3,9 dan 2,8. Aktivitas kegempaan di area tersebut mengindikasikan adanya sesar yang mungkin masih aktif dan berpotensi terjadi gempa kembali sehingga diperlukan identifikasi sesar. Penelitian ini menggunakan metode magnetotelurik (MT) untuk mengidentifikasi Sesar Baribis dan karakteristik bawah permukaannya. Analisis phase tensor digunakan untuk menentukan arah dan dimensi struktur bawah permukaan, sementara pemodelan inversi 2D dilakukan untuk menggambarkan distribusi resistivitas listrik di area penelitian. Tugas akhir ini bertujuan untuk mengidentifikasi Sesar Baribis di area tersebut menggunakan model resistivitas magnetotelurik dua dimensi. Hasil analisis geoelectric strike menunjukkan bahwa arah dominan di area penelitian adalah N 283° E di titik CRB dan N 273° E di titik TM, yang selaras dengan orientasi struktur geologi utama N 270° E. Selain itu, sebagian besar titik di area penelitian menunjukkan karakteristik dimensionalitas 1D atau 2D, dengan beberapa titik yang menunjukkan karakteristik 3D. Hasil pemodelan 2D distribusi resistivitas bawah permukaan menunjukan bahwa posisi sesar aktif diduga pada zona resistivitas rendah (C2) pada lintasan CRB dan TM menunjukkan kemungkinan adanya rekahan besar yang terisi fluida atau mineral lempung dari formasi Qos atau Tms.
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The Baribis Fault segment is part of the West Java Back Arc Thrust (WJBT) that stretches from Cirebon to Majalengka, spanning approximately 14 km. This segment exhibits significant tectonic activity, as evidenced by two shallow earthquakes with magnitudes of 3.9 and 2.8. The
seismic activity in this area indicates the presence of a fault that may still be active and has the potential for future earthquakes, necessitating fault identification. This study uses the Magnetotelluric (MT) method to identify the Baribis Fault and characterize the subsurface. Phase tensor analysis is employed to determine the orientation and dimensions of the subsurface structure, while 2D inversion modeling is performed to illustrate the electrical
resistivity distribution in the study area. The aim of this thesis is to identify the Baribis Fault in the area using a two-dimensional magnetotelluric resistivity model. The geoelectric strike analysis indicates that the dominant orientation in the study area is N 283° E at the CRB point
and N 273° E at the TM point, aligning with the orientation of the main geological structure at N 270° E. Additionally, most points in the study area show 1D or 2D dimensional
characteristics, with some points exhibiting 3D characteristics. The 2D resistivity distribution modeling results suggest that the active fault is likely located in the low-resistivity zone (C2) along the CRB and TM transects, indicating the presence of a major fracture filled with fluids or clay minerals from the Qos or Tms formations.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Sesar Baribis, magnetotelurik, resistivitas listrik, phase tensor, Baribis Fault, magnetotelluric, electrical resistivity, phase tensor
Subjects:	Q Science
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Muhammad Zidan Naufal
Date Deposited:	29 Jul 2025 08:02
Last Modified:	29 Jul 2025 08:02
URI:	http://repository.its.ac.id/id/eprint/122963

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