Analyses and Discussion on Mechanism of Clustered Microearthquakes in Puyang, Henan Province
详细信息
- 责任者：Zheng Jianchang (Earthquake Administration of Shandong Province ; Jinan 250014 ; China) ; Lü Ziqiang
- 刊名：Earthquake Research in China
- 出版年：2013
- 卷期：29(1)
- 关键词：小震 ; small seisms ; 震源机制 ; focal mechanism ; 河南 ; Henan Province
- 页码：p.11-25
- 图表：illus., 59 refs.
- 分类号：0500
- issnNo：ISSN1001-4683
- isbnNo：CN11-2008/P
摘要
Based on microearthquakes fine relocations and focal mechanisms, the paper analyses the causes of clustered microseismicity in Puyang, Henan. The relocated results given by hypoDD shows that the hypocenters of most microearthquakes are situated at the trunk fault of Liaocheng-Lankao fault zone, and its distributions accord with the fault’s attitude. Focal mechanisms of 5 events with ML≥3.5 show that observed waveforms can be well explained by the double couple model. There are mainly strike-slip mechanisms in smaller events, with quadrantal polarities. On the basis of relative materials on geology and tectonic backgrounds of oilfield, the paper discusses inductive relationship between fluid injection for oil-production and microseismicity in this area.
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