桂林理工大学学报2023，Vol.43Issue(4)：581-587,7.DOI:10.3969/j.issn.1674-9057.2023.04.005
全球强震活动的周期性和对称性
Periodicity and symmetry of global seismicity
摘要
Abstract
The study on the distribution of epicentres of global earthquakes with magnitude≥6 from 1961 to 2021 shows that global seismicity has a certain periodicity,and the period of strong earthquake activity is rough-ly 30 years.Earthquakes have balanced characteristics in the spatial and temporal distribution.Spatially,the frequency and focal depth of global earthquakes with magnitude≥6 are symmetrically distributed in the mid-At-lantic ridge and the equator.The frequency of deep-source earthquakes is higher,and the focal depth and fre-quency have better symmetry.In terms of time,before the occurrence of strong earthquakes,it is the stage of stress accumulation,which leads to the enhancement of interplates or intraplates stress field.When the stress field reaches the maximum,a strong earthquake occurs.After the occurrence of a strong earthquake,the stress release will cause the plate to bounce back,and a series of small earthquakes will take place within a certain time range until the stress field reaches equilibrium.On a global scale,seismicity has periodicity and symme-try.关键词
全球强震/时空分布/周期性/对称性Key words
global seismicity/spatial and temporal distribution/periodicity/symmetry分类
地球科学引用本文复制引用
高雯琪,闫磊,王有学,熊彬,余松平..全球强震活动的周期性和对称性[J].桂林理工大学学报,2023,43(4):581-587,7.基金项目
国家自然科学基金项目(42174080) （42174080）
