三维地震在城市活断层探测中的应用

Application of Three-dimensional Seismic Method in Urban Active Fault Detection

城市活断层探测是一项非常复杂的课题。目前用于城市活断层探测的主要物探方法是二维地震勘探。二维地震勘探由于使用大偏移距、单边激发观测系统,对浅部地层的探测不利。三维地震勘探由于数据量大、偏移归位准确、横向分辨率高、探测深度范围大,有利于对复杂构造和小构造的研究。该文结合工程实例,介绍了三维地震在城市活断层探测中的应用,即观测系统选取、资料采集、资料处理、解释方法和应用效果。

Urban active fault detection is an extremely complex the main geophysical method in the urban active fault detection topic. At present 2-D seismic exploration is Because of using larger offset and single-end spread observation system, it is unavailable to detect the shallow stratum. 3-D seismic exploration is advantageous in the complex structure and the small structure study, in which there are mass data, with accurate return offset, the high transverse resolution and large detection depth. In this paper, combined with engineering examples , the application of 3-D seismic exploration in urban active fault detection is introduced, including selection of observation system, data acquisition and processing, interpretation method and aplication effect.