中国台湾地区M_S≥7.0地震前地震活动性参数特征分析

Analysis of seismicity parameters characteristics before M_S≥ 7.0 earthquakes in China Taiwan Region

对1971年以来中国台湾地区11次MS≥7.0主震进行震前地震活动性参数的时空扫描分析。选取参数b、E、N、Mav、S进行震前时间扫描特征分析,结果表明:所选参数在震前异常表现为低值,地震多数发生在低值持续时或者低值异常恢复后1年内。选取Ab和S进行震前空间扫描特征分析,结果表明:地震多数发生在异常区出现明显收缩或扩大之后,震中主要分布在异常区最大面积边缘或外围附近。

This article analyzed space-time characteristics of seismicity parameters before 11 MS≥ 7.0 main earthquakes in China Taiwan Region since 1971. Selected b,E, Mav, N, S to do the time scanning. The results show that the abnormal characteristic of seismicity parameters before earthquakes is low value. Most earthquakes occurred in low value duration or within 1 year after low value anomaly recovery. Selected Ab and S to do the space scanning. The results show that most earthquakes occurred after the abnormal area was enlarged or reduced obviously. The epicenter is mainly distributed in the edge or on the periphery of the maximum abnormal area.