Preliminary Survey of Fracture Location and Stratigraphic Distribution in Target Area using Microtremor Array:a Case Study of the Coastal Area Assessment
In a seismic safety evaluation project in a coastal area,microtremor detection method was adopted to densely observe the target area,addressing issues such as large target area,significant thickness in overburden layers,and complex subsurface concealed structures. This approach success-fully determined the spatial location of the Jiepai-Binhuai Farm Fault and the 3D S-wave velocity structure of the target area. The microtremor detection results were analyzed and compared with data from active source seismic exploration and shear wave velocity logging. The results showed that:(1) For the Jiepai-Binhuai Farm Fault,the characteristics revealed by both microtremor detection and ac-tive source seismic exploration were relatively consistent,demonstrating significant application value as preliminary exploration results;(2) Within a depth of 100 m,the shear wave velocity values ob-tained from microtremor detection were similar to those from wave velocity logging,indicating that microtremor detection technology is suitable for rapid site classification;(3) Compared to logging and active source seismic exploration,microtremor detection technology could ascertain the velocity struc-ture of deep strata in a more economic and swift way,providing additional data and correction basis for 3D stratigraphic modeling of the target area.
microtremor detectionurban area assessment probingJiepai-Binhuai Farm Faultvelocity structure
万方数据
维普
