基于HVSR方法的冷水坑矿田主要断裂构造研究  

Research on Main Fault Structures in the Lengshuikeng Ore Filed Based on HVSR Method

作　　者：陈茂雨 李红星 吴鑫昱 CHEN Maoyu;LI Hongxing;WU Xinyu(School of Geophysics and Measurement-Control Technology,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学地球物理与测控技术学院,江西南昌330013

出　　处：《东华理工大学学报(自然科学版)》2024年第6期538-549,共12页Journal of East China University of Technology(Natural Science)

基　　金：江西省重点研发计划项目(20212BBG73011);国家自然科学基金项目(42474197);江西省自然科学基金重点项目(20242BAB26049)。

摘　　要：为进一步认识冷水坑矿田断裂构造的空间展布及性质,在冷水坑矿田及外围地区布设了26台短周期地震仪进行地震背景噪声观测,利用微动水平与垂直谱比法(HVSR)得到了该区的共振频率、放大系数以及浅层横波速度结构。结果表明,冷水坑矿田断裂带基本展布于共振频率较低区域,F_(2)推覆构造展布于共振频率高低频分界线。放大系数自南西向北东逐渐减小,F_(1)断裂及北西向断裂均展布于低放大系数区域,F_(2)断裂沿放大系数分界线展布。地下横波速度区域性明显,F_(1)断裂通过横波速度低速异常区,F_(2)断裂展布于高低速分界面之间。基于以上研究结果,推测F_(2)断裂存在继续向北延伸的趋势,可以在矿田外围北东方向围绕F_(2)断裂展布与出露位置开展找矿工作。In order to further understand the spatial distribution and properties of the fault structure in the Lengshuikeng 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 frequency and the F_(2) 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 F_(1) fault and the northwest trending fault are both distributed in the low amplification factor area,while the F_(2) fault is distributed along the amplification factor boundary.The regionality of underground shear wave velocity in the study area is obvious.The F_(1) fault passes through the low-velocity anomaly area.The F_(2) fault is distributed between the high and low-speed interfaces.Based on the research results,it is inferred that F_(2) fault continues to extend to the north,and the prospecting work can be carried out around the distribution and emergence location of F_(2) fault in the northeast direction of the outer surface of the ore field.

关 键 词：HVSR方法 共振频率 S波速度结构 冷水坑矿田 

分 类 号：P631.8[天文地球—地质矿产勘探]