利用1∶20万区域重力资料研究宁夏断裂体系

The Research on Ningxia Fault System by Using 1∶200 000 Regional Gravity Data

宁夏大面积为新生界地层覆盖,构造格架的划定一直是本区研究的难点。对比了边界识别的五种常用方法(垂向二阶导数、总水平导数、水平一阶方向导数、斜导数与小波变换),首先分别利用五种方法对全区断裂进行系统独立划定,再对比五种方法独立划定结果,最后综合得出全区断裂构体系。结果表明,重新划定的宁夏全区断裂体系为以后在该区进一步研究活动断层与城市安全、区域与深部构造及其成矿作用提供了新的基础资料。

Ningxia is covered by a large area of the Cenozoic strata,and the delineation of tectonic frames has been a difficult problem in the area.This paper compares five common methods of edge detection（second-order vertical derivative,total horizontal derivative,first-order horizontal derivative,tilt derivative and wavelet analysis）.First,these five methods are used to delineate faults systematically and independently in the whole area Then,the five results which are inferred from the above methods are compared.Finally,the re-evaluated fault system can be put forward under comprehensive considerations.The new fault system in Ningxia area provides new elementary materials that can be used to study active faults,city safety,regional and deep structures,andtheir mineralization.