HR: 13:40h
AN: NS33A-01    [Abstracts]
TI: 4-D imaging of ground condition change using resistivity data
AU: * Yi, M
EM: muse@kigam.re.kr
AF: Koera Institute of Geoscience and Mineral Resources, 30 Gajeong-dong, Yusung-gu, Daejeon, 305-350, Korea, Republic of
AU: Kim, J
EM: jungho@kigam.re.kr
AF: Koera Institute of Geoscience and Mineral Resources, 30 Gajeong-dong, Yusung-gu, Daejeon, 305-350, Korea, Republic of
AU: Son, J
EM: jsson@kigam.re.kr
AF: Koera Institute of Geoscience and Mineral Resources, 30 Gajeong-dong, Yusung-gu, Daejeon, 305-350, Korea, Republic of
AB: Geophysical methods are commonly used to obtain ground condition changes in various application fields of geophysical methods. These monitoring of ground condition needs accurate data measurements as well as proper data evaluation method to obtain or image the change of the physical property of the subsurface with time. In this study, we extended the three-dimensional (3-D) resistivity imaging algorithm to four-dimensional (4-D) imaging algorithm, where measured resistivity data and geoelectric structure of subsurface is assumed to be 4-D (i.e., 3-D in space and varies with time). Compared to the conventional time lapse imaging based on the separate inversion of data set acquired at different time of monitoring survey, 4-D inversion algorithm provided much clear image of the change of the ground with much less inversion artifacts. The algorithm was applied to the field data set and we could show that our 4-D imaging algorithm provides more quantitative means to evaluate the change of the ground conditions and the cause of these changes.
UR: http://www.agu.org
DE: 5109 Magnetic and electrical properties (0925)
SC: Near-Surface Geophysics [NS]
MN: 2007 Fall Meeting