Shelawisata, Hanna Gustini (2018) Pemodelan 3d Kecepatan Gelombang P Dengan Metode Double Difference Dan Tomografi Travel Time Untuk Identifikasi Zona Patahan (Studi Kasus: Patahan Palu-Koro). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Sulawesi Tengah merupakan salah satu wilayah rawan bencana gempabumi di Indonesia. Sumber gempabumi berasal dari patahan aktif di daratan Sulawesi Tengah, salah satunya adalah Patahan Palu-Koro. Penelitian ini dilakukan untuk menentukan model 3D kecepatan gelombang P dan untuk mengidentifikasi zona patahan di daerah penelitian menggunakan metode double difference dan tomografi travel time dengan memanfaatkan data gempabumi lokal. Hasil relokasi hiposenter dengan metode double difference menggunakan program hypoDD adalah irisan penampang vertikal yang melewati patahan Palu-Koro menunjukkan kedalaman patahan tersebut berkisar 3–27 km. Metode Coupled Velocity Hypocenter menggunakan program Velest 3.3 dilakukan dalam penelitian ini bertujuan untuk mendapatkan model 1D kecepatan gelombang P. Model 1D kecepatan gelombang P yang dihasilkan dalam penelitian ini adalah nilai kecepatan antara 3.28 km/s hingga 9.07 km/s pada rentang kedalaman 0 – 36 km. Model 3D kecepatan gelombang P menunjukkan nilai kecepatan antara 5 km/s hingga 9 km/s pada area yang dilewati ray tracing. Relokasi hiposenter dengan metode double difference memiliki kecenderungan berkumpul membentuk cluster yang dapat diindikasikan patahan berada di sekitar cluster. Model 1D kecepatan gelombang P diperoleh mengalami peningkatan nilai pada beberapa lapisan. Model 3D kecepatan gelombang P menunjukkan ray tracing melewati jalur tercepat dan memiliki high velocity yang berasosiasi dengan batuan magmatik di sekitar patahan Palu-koro.==========================================================================================
Central Sulawesi is one of earthquake-prone areas in Indonesia. The source of the earthquake comes from an active fault in Central Sulawesi, one of which is the Palu-Koro Fault. This research was conducted to determine 3D model of P wave velocity and to know the fault zone in research area by using double difference method and travel time tomography by utilizing local earthquake data. The result of hypocenter relocation by double difference method using hypoDD program is vertical cross section which pass Palu-Koro fault indicates the depth of the fault is about 3-27 km. Coupled Velocity Hypocenter method using Velest 3.3 program was done in this research to obtain 1D model of P wave velocity. The 1D model of P wave velocity generated in this study is the value of velocity between 3.28 km/s up to 9,07 km/s at depth range 0-36 km. The 3D model of the P wave velocity shows a speed value between 5 km/s up to 9 km/s in the area through which ray tracing is passed. Hypocenter relocation by double difference method has a tendency gather forming clusters that can be indicated as fracture around the cluster. The 1D model of P wave velocity increased value on several layers. The 3D model of P wave velocity shows ray tracing passing the fastest path and has a high velocity associated with magmatic rocks around the Palu-Koro fault.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Kata kunci: Double Difference, Gempabumi, Patahan Palu-Koro, Tomografi Travel Time |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > QE Geology Q Science > QE Geology > QE538.8 Earthquakes. Seismology Q Science > QE Geology > QE601 Geology, Structural |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses |
| Depositing User: | Hanna Gustini Shelawisata |
| Date Deposited: | 18 Jul 2021 22:52 |
| Last Modified: | 18 Jul 2021 22:52 |
| URI: | http://repository.its.ac.id/id/eprint/57373 |
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