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METHODS AND TECHNIQUES FOR SURVEYING AND PROSPECTING ACTIVE FAULTS IN URBAN AREAS

DENG Qi\|dong 1, XU Xi\|wei 1, ZHANG Xian\|kang 2, WANG Guang\|cai 1 (1 Institute of Geology, China Seismological Bureau, Beijing 100029,China; 2 Geophysical Prospecting Center, China Seismological Bureau, Zhengzhou 450002,China)  
Large earthquake that occurs in the urban area may cause tremendous disaster, involving damages generated by strong ground shaking and surface rupturing along the seismogenic active fault Therefore, it is very important to survey and prospect the active faults and concealed active faults, and to assess their seismic hazards in the urban areas Considering these problems that most of the urban areas facing high noisy and shaking disturbance, heavy pollution and complicated surroundings, here some main methods for surveying and prospecting the active faults are introduced including geological and geomorphologic mapping as well as geochemical and geophysical prospecting methods Geological and geomorphic mapping for latest faulting traces, and drilling and trenching for study of recent activity of the faults and paleoseismology are very important, while the age dating to the young geologic body and geomorphologic surfaces is a key technique Geochemical prospecting, especially surveying by use of multiple geogases, is often used in the first step to locate a possible concealed active fault Shallow seismic prospecting method will play main role among various geophysical exploration methods Various kinds of deep seismic prospecting methods are strongly recommended to detect the deep tectonic settings of active faults which may likely induce future destructive earthquakes Nevertheless, in this new task for active fault detection in the urban areas, we must emphasize and rely on the comprehensive utilization of various kinds of techniques and methods from geology, geomorphology, geochemistry and geophysics, so that we can locate active faults, and better assess the activity of the faults and their capability to generate destructive earthquake
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