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《Seismology and Geology》 2009-01
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APPLICATION OF HIGH-RESOLUTION SEISMIC REFRACTION TECHNOLOGY IN INAPPLICABLE AREA OF SHALLOW REFLECTION SURVEY:EXAMPLES OF SHALLOW SEISMIC EXPLORATION FOR ACTIVE FAULT IN LANZHOU CITY

YANG Zhuo-xin1) YUAN Dao-yang2) DUAN Yong-hong1) XU Zhao-fan1)JIA Shi-xu1) FENG Shao-ying1)1)Geophysical Exploration Center,China Earthquake Administration,Zhengzhou 450002,China2)Earthquake Administration of Gansu Province,Lanzhou 730000,China  
Shallow seismic reflection method is a commonly used technique in urban active fault detection,however,special geotectonic environment may sometimes make reflection survey inapplicable.In such cases,high-resolution seismic refraction could be a feasible option.In this study,we use the finite difference method as the main technique and the conventional methods of refraction data interpretation as auxiliary means in the interpretation of high-resolution shallow refraction data for active fault detection in Lanzhou area.After a comprehensive analysis of first-break refraction travel-time characteristics,the velocity structure and interface structure along each profile have been obtained.A detailed description of the detection results from SS04-1 and SS11-2 seismic profiles is presented in this paper.The main stratigraphic interfaces and tectonic features identified by the two profiles are quite consistent with the results from drilling surveys along the profiles.Our results indicate that high-resolution seismic refraction is an effective replacement in areas where reflection seismic survey is hard to carry out.
【Fund】: 兰州市活断层探测与地震危险性评价项目(14281);; 地震科学联合基金(104026)共同资助
【CateGory Index】: P631.4
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