中国大陆中长期地震活动的群集特征

英文篇名：CLUSTERING OF LONG AND MEDIUM TERM SEISMICITY ON CHINA MAINLAND
中文刊名：地震
英文刊名：EARTHQUAKE
作者：曹志华 ; 傅征祥
英文作者：Cao Zhihua Fu Zhengxiang (Center for Analysis and Prediction ; CSB ; Beijing 100036 ; China)
中文关键词：分维 ; 地震目录 ; 群集 ; 标度不变性
英文关键词：Fractal ; Earthquake catalogue ; Clustering ; Scale invariance
出版日期：1999-10-26
机构：中国地震局分析预报中心!中国北京100036,中国地震局分析预报中心!中国北京100036
年：1999
期：04
出版单位：地震

摘要

主要研究中国华北地区和南北地震带中长期地震活动的时间特征。选取华北地区和南北地震带二个地震活动地区１９７０年以来有仪器记录的完整地震目录。作相关地震删除后对于不同起始震级分别计算不同时－空尺度下观测地震数Ｎｐ与泊松分布下理论地震数ｎｐ的比值（称为时－空“矩”），结果表明无论华北还是南北地震带，无论起始震级是ＭＬ３．０或ＭＬ４．０，所有的地震活动过程都显示群集特征Ｎｐ／ｎｐ＞１。地震活动随时间呈指数分布，具有标度不变性，分维数在０．２～０．７之间变化。
This paper analyses the characteristics of long and medium term seismicity on China's mainland. We selected earthquake catalogue on North china seismic region and South North seismic zone from 1970.1 till 1997.12. After removing the dependent earthquakes, we have found that all earthquakes, either North china seismic region or South north seismic zone, from M L  3.0 or M L 4.0, the feature of residual earthquakes shows clustering. And the long term variation of seismicity is governed by power law temporal distribution; it is scale invariant. The fractal dimension of shallow earthquakes on china mainland changes from 0.2～0.7.

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