Abstract
Fault is a displacement of the land with a certain direction and shift that triggers an earthquake. The existence of faults that are not visible on the surface can be identified by measuring the gravity anomaly above the earth's surface around the fault zone. This study was conducted with the aim of testing the effectiveness of radial derivatives for identification of fault zones, i.e the presence and positions of faults. Radial derivative is a horizontal derivative of the earth's gravity anomaly value with the radial direction away from a certain point that is considered as the radial center. Gravity anomaly data used in this study is synthetic data from computer calculations using the principle of forward modeling from a fault model. This model is in the form of a displacement of the rocks making up the soil at a depth of 100 m with a vertical shift direction of 4 m with an area of the fault zone 600 m x 600 m or 360,000 m2. This synthetic gravity data is then performed a radial derivative treatment. The results of this study show that radial derivatives are able to identify the presence and position of the fault.
Highlights
Radial Derivative of Gravity Anomaly for Identification of Fault Zone
The results of this study show that radial derivatives are able to identify the presence and position of the fault
Untuk penelitian selanjutnya perlu dilakukan pengambilan data gravitasi di lapangan yang dicurigai terdapat struktur sesar, untuk kemudian diberi perlakuan derivatif radial
Summary
Radial Derivative of Gravity Anomaly for Identification of Fault Zone. Fault is a displacement of the land with a certain direction and shift that triggers an earthquake. Derivatif radial adalah derivatif horizontal dari nilai anomali gravitasi bumi dengan arah radial menjauhi titik tertentu yang dianggap sebagai pusat radial. Data anomali gravitasi yang dipakai pada penelitian ini adalah data sintetis hasil perhitungan komputer dengan prinsip forward modeling (pemodelan kedepan) dari suatu model sesar. Hasil penelitian ini menunjukkan bahwa derivatif radial mampu mengidentifikasi keberadaan dan posisi sesar dengan tepat.
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