Browse > Article

Seismic Refraction Analysis to Estimate the Depth to the Bedrock: Case Study  

Lee, Doo-Sung (Information System Engineering, Hansung University)
Publication Information
Geophysics and Geophysical Exploration / v.8, no.4, 2005 , pp. 237-242 More about this Journal
Abstract
A seismic refraction study in estimation of depth to the bedrock demonstrates that 1) the average velocity in the medium is about 250 m/s in the surface layer (< 4 m), 2,500 m/s in the weathered formation, and greater than 3,000 m/s in the bedrock, 2) the depth to the deepest reflector assumed to be the bedrock is about 17 m; however, according to the cores collected in a borehole in study area, the bedrock (granite) occurred at depth 25 m, 3) according to the density and velocity logging, at depth 17 m, a measurable velocity and density increase are observed, and 4) the velocity of the weathered formation is relatively high and therefore, the acquisition offsets ($70{\sim}80m$) are turned out not to be long enough to record the refracted signal from the bedrock at depth 25 m as first arrivals.
Keywords
Seismic refraction; Bedrock; Offset;
Citations & Related Records
연도 인용수 순위
  • Reference
1 유영철, 이상태, 유영준, 황세호, 신제현, 2005, 포천지역 지하수기초조사 산학연 공동탐사 사례연구(I): 공내탐사기술, 2005년 한국물리탐사학회 대한지구물리학회 공동 학술대회 논문집, 117-122
2 Palmer, D., 1981, An introduction to the generalized reciprocal method of seismic interpretation, Geophysics, 46, 1508-1518
3 Palmer, D., 1980, The generalized reciprocal method of seismicrefraction interpretation, Soc. Expl. Geophys
4 유영준, 김종남, 유인걸, 2005, 포천지역 지하수 기초조사 산학연 공동탐사 사례연구(3):전기탐사기술, 2005년 한국물리탐사학회 대한지구물리학회 공동 학술대회 논문집, 129-136
5 이두성, 유영준, 유영철, 2005, 포천지역 지하수 기초조사 산학연공동탐사 사례연구(2):탄성파 탐사기술, 2005년 한국물리탐사학회 대한지구물리학회 공동 학술대회 논문집, 123-127
6 대한광업진흥공사, 2004, 포천지역 지하수 기초조사보고서, P538
7 Qin, F., Olsen, K. B., Cai, W., and Schuster, G T., 1989, Finite-difference solution of the eikonal equation along expanding wavefronts, Geophusics, 57, 478-487
8 고광범, 이두성, 2002, 탄성파 굴절법 파선토모그래피에 의한 지반침하 해석, 한국자원공학회지, 39, 283-288