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《Chinese Journal of Geophysics》 2012-12
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Ocean coast effect on land-side magnetotelluric data in the vicinity of the coast

ZHANG Fan1,2,WEI Wen-Bo1,2,3,JIN Sheng1,2,YE Gao-Feng1,2,JING Jian-En1,2, ZHANG Le-Tian1,2,DONG Hao1,2,XIE Cheng-Liang1,2,WANG Hui1,2 1 School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083,China 2 Key Laboratory of Geo-detection,Ministry of Education,Beijing 100083,China 3 State Key Laboratory of Geological Processes and Mineral Resources,Beijing 100083,China  
When land-side magnetotelluric(MT) data are obtained in the vicinity of the coast,observed MT responses are distorted because of the ocean coast effect.It is difficult to interpret subsurface electrical structures by using MT method.This study is supported by SinoProbe-01-02.The effects of the ocean coast with various depths of seawater and various topographic conditions of seabed on MT data have been studied by forward modeling in this article.The results are also described in this article.When the distance between MT sounding stations and the coast is smaller than the skin depth of the frequency of interest,the existence of conductive sea around the survey area affects the electromagnetic distribution.Ocean coast effects lead to the modification of the apparent resistivity and phase of MT responses in varying degrees.At long periods,MT responses are affected seriously by ocean coast effects.There are good results in the shallow strata in the vicinity of the coast using both 1D Occam inversion and 2D NLCG inversion.When the surrounding sea is deep enough or topographic condition of seabed is complicated enough,it can generate artificial resistivity anomalies in both 1D Occam inversion and 2D NLCG inversion.It is difficult to interpret subsurface electrical structures correctly.The MT data at low frequencies may suffer severely from coast effect contamination in the vicinity of the Bohai Sea.
【Fund】: 国家深部探测技术与实验研究专项(SinoProbe-01-02)资助
【CateGory Index】: P631.325
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