Statistic Distribution of Non-Empty Grid Numbers for Earthquakes and Quantitative Test on Enhanced and Quiescent Activity
详细信息
- 责任者：Jiang Haikun (China Earthquake Networks Center ; Beijing 100045 ; China) ; Wu Qiong
- 刊名：Acta Seismologica Sinica
- 出版年：2012
- 卷期：34(1)
- 关键词：震中分布 ; epicenter distribution ; 华北地区 ; North China
- 页码：p.52-63
- 图表：7 illus., 3 tables, 35 refs.
- 分类号：0500
- 出版序号：20130070
- issnNo：ISSN0253-3782
- isbnNo：CN11-2021/P
摘要
Based on the earthquake data during 1980～2010 in North China region,the authors use the grids with l×l unit size to cover the area and investigate the variation of non-empty box number of earthquakes. The statistics show that in North China the forecasting efficiency is low for “quiescence” type abnormal, the “enhanced” type abnormal has a higher correct alarm rate, and the precursory criterion both by “enhanced” and “quiescence” type abnormal has a higher forecasting efficiency. This means that the precursory of small or moderate earthquakes before large earthquakes mainly displays as “enhanced” activity.
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