Application of Generalized Reciprocal Method on 2D Seismic Refraction Data in Mt. Manglayang, West Java Yosi Dinar Nugerahani (a), Firman Hadi Muhammad (b), Reva Wiratama (c*), Imamal Muttaqien (a), Rena Denya Agustina (d)
a) Department of Physics, Faculty of Science and Technology, State Islamic University of Sunan Gunung Djati Bandung
b) Department of Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Indonesia
c) Department of Applied Geophysics, Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology in Krakow, Poland
*revawiratama[at]outlook.com
d) Department of Physics Education, Faculty of Tarbiyah and Teacher Training, , State Islamic University of Sunan Gunung Djati Bandung
Abstract
The imaging of shallow subsurface structures, weathered rock thickness and velocity propagation distribution of the rocks can be identified by seismic refraction, this method is one of geophysical exploration method utilizing refracted wave once it reaches the boundary of subsurface layer. In this research we used Generalized Reciprocal Method (GRM) as one of robust processing method in analyzing subsurface data, this method was chosen due to its accuracy to interpret shallow subsurface layer with high undulating refractors by determining Time Velocity analysis, XY optimum distances, and Time Depth analysis, then, the expected depth values can be achieved. The acquisitions of data for this research had been conducted using 13 geophones with the forward and reverse sources, the data then were picked to get travel time values and inverted to obtain real geological setting of the earth. The results were interpreted as 2 layers, the first layer had velocity distribution at 499,289 m/s which was identified as weathered layer with the thickness about 4,74 meters, whereas the second layer was interpreted as clay rock with velocity distribution at 1270,433 m/s with the thickness reached up to 16 meters.
