斜率差信息法在震情分析研究中的应用

Application of Slope-difference Information Method in Earthquake Consideration

利用斜率差信息法对唐山地区准连续型大地形变资料进行了前兆信息的提取,对形变资料进行了全时域扫描,并进行了多种方案的对比筛选。对首都圈、尤其是唐山附近的5级以上地震与异常的对应关系进行了统计。由于地震活动存在阶段性差异,优化筛选方案后进行了分段扫描,取唐山附近3级以上小震进行对比分析,并对其统计结果进行了R值评分,在97.5％的置信水平下,通过了检验。研究结果表明,地震活动的强弱存在明显的阶段性特征,而斜率差异常信息与该区域中小地震的对应关系也存在阶段性特征。

In this paper precursory information is extracted from quasi-continuous geodetic data in Tang-shan area with slope-difference method,in which the deformation data are scaned over total time domain and calculation schemes are compared and selected. The statistical relation between the anomalies of the deformation and the earthquakes with magnitude ML≥5. 0 in Capital Circle,especially in Tangshan area is presented. Because the seismicities in different period arc different,scans are performed over different time spans after optimal schemes are selected. With the confidence level of 97. 5% ,the test of R-value evaluation is made and the information extracted are significant. The results have shown that the earthquake activities in different period are different and relationships between slope-difference abnormal information and moderate-small earthquakes in the area are also different in different periods.