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《Geology and Exploration》 2017-05
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Application of the Resistivity Tomography Method to Detection of Active Faults Northeast of the Hainan Island

CAO Xin-wen;MA Xiu-min;HU Dao-gong;College of Geoscience,China University of Petroleum;Institute of Geomechanics,Chinese Academy of Geological Sciences;Key Lab of Neotectonic Movement and Geohazards,Ministry of Land and Resources;College of Civil and Resource Engineering,University of Science & Technology;  
In the northeastern Hainan island,where the 1605 Qiongshan earthquake occurred,there exist many nearly EW-trending and NW-trending active faults,all of which are buried at depth. This work attempted to clarify the locations and geometries of these faults using the resistivity tomography method,focusing on four NW trending ones,i. e.,the Qiongshan-Puqian fault( F8),F7,F6,and F5. According to previous hydrological borehole data,three electrical survey lines were deployed on the north side of the Zhuxi River and LuoD ou farm. The results show that regional sedimentary strata can be delineated by apparent resistivity gradient zones on three inversion profiles,respectively,well consistent with the borehole data. Meanwhile,obvious low-resistivity anomalies are present on the four known active faults,and except F7 tending to be controversial in explanation,the other three interpreted faults are all confirmed by drilling data.
【Fund】: 中国地质调查局地质调查项目(DD20160269);; 中央级公益性科研院所基本科研业务费专项(YYWF201615)联合资助
【CateGory Index】: P315.7;P631.3
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