Time space feature of seismicity;
地震活动时—空特征；
Earthquake catalogs provide basic data set for the study of seismicity.
地震目录是研究地震活动性的基本资料。
The global seismicity in the fourth quarter of the year 1997 was in high level.
1997年第四季度，全球地震活动为高水平。
The global seismicity of the first quarter of the year 1987 appeared to be active.
1987年第一季度的全球地震活动呈现活跃的态势。
The global seismicity of the first quarter of the year 1987 appeared to be active.
1987年第一季度的全球地震活动呈现活跃的态势。
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