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http://dx.doi.org/10.9720/kseg.2015.3.349

Geophysical Imaging of Alluvial Water Table and the underlying Layers of Weathered and Soft Rocks  

Ju, Hyeon-Tae (Dept. of Earth and Environmental Sciences, Chungbuk National University)
Lee, Chul-Hee (Dept. of Earth and Environmental Sciences, Chungbuk National University,ASIAGEO Co., Ltd.)
Kim, Ji-Soo (Dept. of Earth and Environmental Sciences, Chungbuk National University)
Publication Information
The Journal of Engineering Geology / v.25, no.3, 2015 , pp. 349-356 More about this Journal
Abstract
Although geophysical methods are useful and generally provide valuable information about the subsurface, it is important to recognize their limitations. A common limitation is the lack of sufficient contrast in physical properties between different layers. Thus, multiple methods are commonly used to best constrain the physical properties of different layers and interpret each section individually. Ground penetrating radar (GPR) and shallow seismic reflection (SSR) methods, used for shallow and very shallow subsurface imaging, respond to dielectric and velocity contrasts between layers, respectively. In this study, we merged GPR and SSR data from a test site within the Cheongui granitic mass, where the water table is ~3 m deep all year. We interpreted the data in combination with field observations and existing data from drill cores and well logs. GPR and SSR reflections from the tops of the sand layer, water table, and weathered and soft rocks are successfully mapped in a single section, and they correlate well with electrical resistivity data and SPS (suspension PS) well-logging profiles. In addition, subsurface interfaces in the integrated section correlate well with S-wave velocity structures from multi-channel analysis shear wave (MASW) data, a method that was recently developed to enhance lateral resolution on the basis of CMP (common midpoint) cross-correlation (CMPCC) analysis.
Keywords
dielectric interface; velocity interface; MASW; CMP cross-correlation;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Baker, G. S., Steeples, D. W., Schmeissner, C., Pavlovic, M., and Plumb, R., 2001, Near-surface imaging using coincident seismic and GPR data. Geophysical Research Letters, 28(4), 627-630.   DOI
2 Cardimona, S., Clement, W. P., Kadinsky-Cade, K., 1998, Seismic reflection and ground penetrating radar imaging of a shallow aquifer, Geophysics, 63, 1310-1317.   DOI
3 Hayashi, K. and Suzuki, H., 2004, CMP cross-correlation analysis of multi-channel surface-wave data, Exploration Geophysics, 35, 7-13.   DOI
4 Ju, H. T. and Kim, J. S., 2014, Complementary Integration of Shallow Seismic Reflection and GPR Data, Joint Conference of the Geological Science & Technology of Korea, 327.
5 Porsani, J. L., Sauck, W. A., and Jnior, A. O. S., 2006, GPR for mapping fractures and as a guide for the extraction of ornamental granite from a quarry: A case study from southern Brazil. Journal of Applied Geophysics, 58, 177-178.   DOI
6 Schlumberger Ltd., 2010a, OMNI3D Workshop Seismic Survey Design & Modeling, USA.
7 Schlumberger Ltd., 2010b, VISTA 2D/3D Full PRO Seismic Processing Software, USA.
8 Sloan, S. D., Tsoflias, G. P., Steeples, D. W., and Vincent, P. D., 2007, High-resolution ultra-shallow subsurface imaging by integrating near-surface seismic reflection and ground-penetrating radar data in the depth domain. Journal of Applied Geophysics, 62, 281-286.   DOI
9 Tatsunori, I., Takeshi, T., and Toshifumi, M., 2013, Window-controlled CMP crosscorrelation analysis for surface waves in laterally heterogeneous media, Geophysics, 78(6), EN95-EN105.   DOI
10 Kim, H. S. and Kim, J. Y., 2008, High-resolution profiling of alluvial aquifer in potential riverbank filtration site by use of combining CMP refraction and reflection seismic methods, Journal of Applied Geophysics, 66, 1-14.   DOI
11 Kim, J. H., Yi, M. J., and Song, Y., 2007, Application of geophysical methods to the safety analysis of an earth dam, Journal of Environmental and Engineering Geophysics, 12, 221-235.   DOI
12 Kim, J. S., Moon, W. I., Lodha, G., Serzu, M., and Soonawala, N., 1994, Imaging of reflection seismic energy for mapping shallow fracture zones in crystalline rocks, Geophysics, 59(5), 753-765.   DOI
13 Lee, S. J., Kim, J. S., Lee, C. H., and Moon, Y. S., 2010, Fast Delineation of the Depth to Bedrock using the GRM during the Seismic Refraction Survey in Cheongju Granite Area, Economic and Environmental Geology, 43(6), 615-623 (in Korean with English abstract).
14 Miller, R. D. and Xia, J., 1998, Large near-surface velocity gradients on shallow seismic reflection data, Geophysics, 63(4), 1348-1356.   DOI
15 Park, C. B., Miller, R. D., and Xia, J., 1999, Multichannel analysis of surface waves, Geophysics, 64(3), 800-808.   DOI