微动勘查方法及其研究进展

Microtremor survey method and its progress

本文简要回顾了微动的发展历史,并着重介绍了微动勘查方法的原理、方法及其最新进展.当今,城市物探中传统的地球物理勘探方法越来越受到限制,微动勘查方法以施工简单、成本低、费时短、对环境没有任何影响等优点,越发显现出其优势.由于横波速度对煤层陷落柱、采空区等速度异常区反映敏感,微动方法对探测陷落柱及解决村庄覆盖区的煤层构造问题,具有得天独厚的技术优势和应用前景.

In this paper,the historical development of the microtremor method is briefly reviewed.It is focused on,the principle of the microtremor survey,its observation systems,processing methods and recent advances.Any conventional geophysical method has its own limitations.The increasing environmental and operational costs further restrict the use of these conventional methods,especially in urban areas.The microtremor survey method,on the other hand,provides us with useful information about the shear-wave velocity profile,which is difficult to obtain using conventional methods.Moreover,it is cost-efficient and environmentally friendly.Because of it sensitivity to the anomalous low S-wave velocity in downcast columns,mined-out areas and other unusual geological bodies,the microtremor survey method is technically superior to any other geophysical method in detecting or mapping these low or high velocity anomalies.It is also useful in mapping geological structures,such as coal seams,and underneath villages.