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《Seismology and Geology》 2002-04
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BAI Deng-hai 1) WANG Li-feng 1) SUN Jie 1) ZHU Jin-fang 2) HUANG Zong-lin 2) HUANG Dan-qing 3) HE Zhao-hai 1) ZU Jin-hua 1) LIAN Yu-fang 1) Quentin Yarie 4) Volker Schaepe 5) 1) Institute of Geology, China Seismological Bureau, Beijing 100029, China 2) Seismological Bureau of Fujian Province, Fuzhou 350003, China 3) Institute of Geophysical Exploration, China Coal Geological Bureau, Zhuo Zhou 072750, Hebei Province, China 4) GEONICS LIMITED, 8-1745, Meyerside Drive, Mississauga, Ontario L5T 1C6, Canada 5) DMT Mines & More Division, Deutsche Montan Technologie GmbH, Am Technologiepark 1, 45307 Essen, Germany  
To test the effectiveness of DC and TEM soundings for urban active faults, experiments were carried out in Fuzhou City, Fujian Province in 2001. This paper is focusing on the test results of the Bayishuiku-Shanggan Fault, which is the major fault crossing the downtown of Fuzhou City. Two DC (DC-Ⅰ-1 and DC-Ⅰ-23) and three TEM (TEM-Ⅰ-1, TEM-Ⅰ-2 and TEM-Ⅰ-3) traverses were deployed in Bayishuiku area. DC experiment used a RESECS equipment. An array of 96 electrodes (192m long) was employed for the measurement, while a 16 electrode string (32m long) is prepared for rolling ahead at the end of the array for a long traverse. Electrode spacing is 2m. TEM used EM-47 and EM-67 systems. For EM-47 the measurements were made at the center of the transmitter loop with a dimension of 40m×40m. A large fixed loop with side length of 100~200m was employed for EM-67. Two adjacent loops overlap half of the side length. Site spacing is 10m for both EM-47 and EM-67. DC models show the electric structures at a depth range of 1 to 30m, while TEM models indicate those of 10 to 300m depths. DC model coincides excellently with the TEM model in the same traverse. All the DC and TEM models represent a layered structure with a strong vertical low resistivity anomaly in the middle part of each profile, which is inferred to be the main strand of the Bayishuiku-Shanggan Fault in the area. The fault appears to be several ten meters wide dipping NNE into the basement. The experiments suggest that the results will be much improved by using the combined DC and TEM method.
【Fund】: 国家发展计划委员会项目 (2 0 0 1977)资助。
【CateGory Index】: P631.3
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