Research on Main Fault Structures in the Lengshuikeng Ore Filed Based on HVSR Method
In order to further understand the spatial distribution and properties of the fault structure in the Leng-shuikeng ore field,26 short-period seismometers were deployed in the Lengshuikeng ore field and its surrounding areas to observe seismic background noise.The resonance frequency,amplification coefficient,and the shallow S-wave velocity structure were obtained by the Horizontal-to-Vertical Spectral Ratio of microtremor method(HVSR).The result shows that the fault zone in the Lengshuikeng ore field distributed in the area with low resonance fre-quency and the F2 nappe structure is distributed in the boundary between high frequency and low frequency.The amplification coefficients of the study area gradually decreas from southwest to northeast.The F1 fault and the northwest trending fault are both distributed in the low amplification factor area,while the F2 fault is distributed a-long the amplification factor boundary.The regionality of underground shear wave velocity in the study area is obvi-ous.The F1 fault passes through the low-velocity anomaly area.The F2 fault is distributed between the high and low-speed interfaces.Based on the research results,it is inferred that F2 fault continues to extend to the north,and the prospecting work can be carried out around the distribution and emergence location of F2 fault in the northeast direction of the outer surface of the ore field.
HVSR methodresonant frequencyS-wave velocity structureLengshuikeng ore field
NETL
NSTL
万方数据
