THE APPLICATION OF SEISMIC REFRACTION SURVEY FOR SUBSURFACE PROFILE INVESTIGATION
The information of the subsurface profile is important to be use in civil engineering design and construction. The problem such as structure defect and failure may arise if the information gathered from the site investigation works was unreliable. This study determines the solution approaches for subsurface profile determination by using seismic refraction survey and borehole exploration method. From past experienced, borehole exploration which consider as a conventional method was a very popular used in site investigation compared to other method. The subsurface profile data used from the conventional method for design and construction sometimes creates cases of structure defect and failure due to lack of information about subsurface profile. This situation proves that the site investigation works by borehole exploration should be supported with other method due to its limitation and the uncertainties of soil. This study is carried out for investigating other method which reliable to be considered in studying subsurface profile. Hence, this study introduced the seismic refraction survey which used the seismic waves generated by one of several types of energy sources and detected by arrays of sensitive devices called geophones for subsurface profile data compared with borehole exploration. Those methods are used to determine the information of the subsurface profile such as depth layers, type of soil/rock and the groundwater table. It was found that the seismic refraction survey produce the results which almost similar to the borehole method. This proved that the seismic refraction survey was a good technique to be applied together with a conventional method in civil engineering site investigation in order to produce much reliable information.