1. Surface geophysical investigations of landslide at the Wiri area in southeastern Korea.
- Author
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Man-Il Kim, Ji-Soo Kim, Nam-Won Kim, and Gyo-Cheol Jeong
- Subjects
LANDSLIDES ,SURFACE fault ruptures ,SEISMIC wave velocity ,GEOPHYSICAL surveys - Abstract
geophysical survey was undertaken at Wiri area of the Andong in southeastern Korea to delineate subsurface structure and to detect the fault zone, which affected the 1997 mountain-hill subsidence and subsequent road heaving initiated by the intense rainfall. Electrical resistivity methods of dipole-dipole array profiling and Schlumberger array sounding and seismic methods of refraction and reflection profiling were used to map a clay zone, which was regarded as the major factor for the landslide. The clay zone was identified in electrical resistivity and seismic sections as having low electrical resistivity (<100 Ωm) and low seismic velocity (<400 m/s), respectively. The clay zone detected by using geophysical methods is well correlated with its distribution from the trench and drill-core data. The results of the electrical and seismic surveys showed that slope subsidence was associated with the sliding of saturated clay along a fault plane trending NNW-SSE and dipping 10°-20° SW. However, the road heaving was caused by the slope movement of the saturated clay along a sub-vertical NNE-trending fault. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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