广州市区域地壳稳定性评价

The Evaluation of Regional Crustal Stability in Guangzhou City

本文以广州市地壳为研究对象,以构造稳定性研究为主体,兼顾其他因素,采用模糊数学评判方法,对广州市区域地壳稳定性进行了探讨。区域稳定性的研究是以现今断层活动性、历史地震、地壳升降幅度与地球物理参数等资料为依据,综合分析探讨构造现今活动并得到最终的稳定性评价结果。在稳定性评价基础上将地壳稳定性划分出很稳定、稳定、中等稳定、不稳定和很不稳定五个等级,并将广州行政区域分成A-W共23个单元。最后使用计算机语言编写出模糊数学方法的计算程序,在windowsxp环境中运行出所需结果。评价结果表明:很稳定区(8个单元)占全部的34.8%,稳定区(14个单元)占全部的60.9%,中等稳定区(1个单元)占余下的4.3%,不稳定和很不稳定区各占0%。由此可知广州市地壳整体稳定性高,稳定区域远远多于不稳定区域。

Taking Guangzhou City as researching object, the regional crustal stability of Guangzhou City is studied in this thesis. By the method of fuzzy mathematical modle, Tectonic stability as main body, and other factors are discussed to ascertain the stability. Regional stability is based on current activity of faults, historical earthquakes, crustal rise and decline in Quaternary, tbe physical parameters of the earth. According to the stability evaluation, the stability can be divided into five further relative stable levels： very stable, sub-stable, mid-stable, less stable and unstable; also, this region is divided into 23 units which are name from A to W. Fuzzy mathematical modle is last programmed by computer and calculated under the system of windows xp. It is shown by the result of evaluation： very stable area （8 units） is accounted for 34. 8%; sub-stable area （14 units） is accounted for 60. 9% ; mid-stable （ 1 unit） is accounted for the last 4. 3% ; and less stable and unstable area are accounted for 0% respeclly. So, it is easy to know that the regional crust in Guangzhou City is highly stable, and the stable area is much more than unstable one.