PEMETAAN LUBANG DI ATAS TEROWONGAN JALAN TOL CISUMDAWU MENGGUNAKAN METODE SEISMIK REFLEKSI DANGKAL SUMEDANG, JAWA BARAT

• Main Author: Masimuja, Gantang
• Format: Final Project
• Language: Indonesia
• Subjects: Fisika
• Online Access: https://digilib.itb.ac.id/gdl/view/41469
• Institution: Institut Teknologi Bandung

The seismic reflection method is a geophysical method that utilizes seismic wave propagation for subsurface geological structures. Since 1980 this method was developed for civil and environmental engineering research with a depth of less than 200 m. This method is called shallow reflection seismic. There has also been a decline in the surface of the earth above the Cisumdawu Toll tunnel so this research is aimed at determining the small holes that are above the tunnel. Data was collected on December 31, 2018. Using 24 active geophones with lines in the direction of the tunnel and perpendicular to the direction of the tunnel. Each line consists of 20 stretches. The distance of each geophone and off-set distance is 5 m. The tool used to record seismic data is Seistronix-RAS24. Global Positioning System (GPSf) is used to determine the topography of the firing point and geophone point. Data processing using Visual_SUNT software. The results of data processing obtained NMO velocity of 1120 m/s and 1020 m/s for a unidirectional and perpendicular path to the tunnel. The TWT values for unidirectional and perpendicular paths with tunnels are 44 ms and 46 ms. So that the predicted location of the hole is at 23 to 24 meters below ground level.