Analyze of Small Earthquakes Frequency Characteristic before Medium-Strong Earthquakes in the Northeast China
详细信息
- 责任者：Li Yongzhen (Earthquake Administration of Liaoning Province ; Shenyang 110034 ; China)
- 刊名：Journal of Seismological Research
- 出版年：2012
- 卷期：35(1)
- 关键词：小震 ; small seisms ; 强震 ; strong earthquakes ; 东北地区 ; Northeast China
- 页码：p.12-17
- 图表：6 illus., 17 refs.
- 分类号：0500
- issnNo：ISSN1000-0666
- isbnNo：CN53-1062/P
摘要
Since 1970,13 earthquakes of M≥ 5.0 occurred in the Northeast China,of which 8 medium-strong earthquakes are independent in space and time.Having studied small earthquakes before the 8 medium-strong earthquakes systemically,we found that these small earthquakes activities increased.Combining with characteristics of the small earthquake activities in the Northeast China,we proposed and applied the new method whether the spatial changing pattern of small earthquake activities change the small earthquake frequency.The result showed that the small earthquake frequency calculated by using new method could pick up anomaly frequency of small earthquakes before medium-strong earthquake.The authors could get medium-short-term abnormal indexes effectively before the medium-strong earthquakes in Northeast China.
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