SPAC法在海口江东新区新近纪-第四纪地层精细划分中的应用

微动探测技术作为一种新型的地球物理勘探方法，已成为工程地质勘察及隐伏地质构造探测的重要手段。本文基于微动探测SPAC法基本原理，选取研究区内121个微动测点及6个地质钻孔，比对单点S波速度结构与钻孔岩性结构，结果显示岩性界面探测精度在0.44%~5.54%之间，表明微动探测法划分岩性差异较大的地层界面是可靠的；结合二维视横波速度剖面识别出区内地层单元及隐伏地质构造，取得了较好的地质效果，为海口江东新区新近纪-第四纪地层单元划分提供数据支撑。

Application of SPAC method on to the fine division of Neogene-Quaternary strata in Haikou Jiangdong New District

As a new geophysical exploration method, microtremor detection technology has become an important technology for engineering geological investigation and survey of the buried fault structure. Based on the principle of SPAC method, this study comparing the single point S-wave velocity structure and the lithologic structure of the boreholes by selecting 121 data and 6 geological boreholes in study area. The results show that the detection accuracy of lithologic interface is between 0.44% and 5.54%, which indicates that the microtremor detection technology is reliable in dividing the stratigraphic interface with large differences of lithologic. In combination with the 2D apparent S-wave velocity structure, the stratum units and buried fault in the study area are identified , and achieving better geological effects, proving data support for division of Neogene-Quaternary stratigraphic units in Jiangdong New District of Haikou.