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本文从整理贵州历史地震资料出发,利用多种统计方法,发现贵州地震活动有如下一些特征: 1.贵州每一地震活动区的各活动阶段,与全国强地震带(区)相应阶段的统计特点不同,反映了弱震区与强震区的蕴震机制可能是不同的。 2.贵州地震活动的总特点是频度低、强度小,地震平均复发周期较之全国强地震带(区)相应的周期要长得多。 3.贵州地震活动明显受滇东地震活动影响,滇东地震活动处于高潮时,贵州地震活动水平也相应增强,反映了康滇菱形块体对贵州地壳应力集中的影响。 4.贵州地震活动与地球自转存在着相关,其关系受贵州构造体系的制约,总的来说,贵州地震活动主要受地球自转长周期减速段的影响。 5.计算证明,贵州5级以上地震次序迁移的距离序列和迁移角序列均为平独立过程。这表明贵州中强地震的发生是随机的,也反映了从大范围来看贵州地壳结构是均匀的。
Based on the compilation of historical seismic data in Guizhou, the authors use various statistical methods to find out some characteristics of seismic activity in Guizhou: 1. The statistical characteristics of each active phase of each seismic activity zone in Guizhou and the corresponding phases of the strong seismic zone (zone) Different, reflecting that the mechanism of the epicenter of weak earthquakes and strong earthquakes may be different. 2. The general characteristics of seismic activity in Guizhou is that the frequency is low and the intensity is small. The mean earthquake recurrence period is much longer than that of the strong earthquake zone (area) in China. 3. The seismic activity in Guizhou is obviously affected by the earthquakes in eastern Yunnan. When the seismic activity in the eastern Yunnan is at orgasm, the seismic activity level in Guizhou increases correspondingly, which reflects the influence of the Kangdian diamond block on the stress concentration in the crust in Guizhou. Earthquake activity in Guizhou is related to Earth’s rotation, and its relationship is restricted by the tectonic system in Guizhou. Generally speaking, the seismic activity in Guizhou is mainly affected by the long-period deceleration section of Earth’s rotation. It is proved by calculation that both the distance sequence and the migration angle sequence of M≥5 migration are all independent processes. This shows that the occurrence of the moderate-strong earthquakes in Guizhou is random and reflects the fact that the crustal structure in Guizhou is homogeneous from a large area.