ANALISIS SECOND VERTICAL DERIVATIVE DATA GRAVITASI UNTUK MENGINTERPRETASIKAN STRUKTUR BAWAH PERMUKAAN DAERAH LEMBANG
Nirmala Ratri Prasetyaningsih, Jurusan Fisika, Universitas Jenderal Soedirman, Purwokerto, Indonesia, Indonesia
Umi Pratiwi, Jurusan Fisika, Universitas Jenderal Soedirman, Purwokerto, Indonesia, Indonesia
Ali Azimi, Badan Meteorologi, Klimatologi dan Geofisika, Indonesia, Indonesia
Abstract
Analisis data gravitasi Topex dengan metode Second Vertical Derivative (SVD) bertujuan untuk menentukan struktur bawah permukaan di wilayah Lembang Jawa Barat. Data gravitasi yang diunduh dari website Topex, dilakukan koreksi sehingga dapat diketahui pola persebaran kenampakan Anomali Bouguer Sederhana (ABS) berdasarkan interpretasi data gravitasi, dan mengetahui kontur hasil SVD Filter Elkins (1951) dalam penentuan jenis struktur bawah permukaan di Lembang, Jawa Barat. Data yang digunakan adalah data sekunder yang meliputi data gravitasi yang sudah terkoreksi hingga Free Airy Anomaly (FAA) dan topografi yang diambil dari website satelit Topex dengan koordinat 107˚32’ E – 107˚46’ E dan 6˚45’ S – 6˚52’ S. Penelitian ini menggunakan Microsoft Excel 2013, Software Surfer 17, Notepad ++, dan Google Earth Pro. Metode yang digunakan dalam penelitian ini adalah metode gravitasi dan metode Second Vertical Derivatif (SVD) Filter Elkins. Hasil yang diperoleh dari penelitian ini menunjukkan hasil koreksi data gravitasi menghasilkan 120 data nilai ABS, 3 pola sebaran ABS meliputi: anomali tinggi, anomali sedang, dan anomali rendah serta hasil analisa grafik slicing masing-masing line menunjukkan struktur bawah permukaan di Lembang merupakan jenis patahan normal.
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DOI: https://doi.org/10.21831/fisika%20-%20s1.v11i2.22239
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