“霍山震情窗”动力学背景及预测意义分析

Dynamic backgrounds of the “Huoshan Seismic Window” and its implications

安徽"霍山震情窗"作为华东地区的应力敏感部位,能够以微震、小震活动的形式反映区域应力场的变化。本文基于应变能释放方法对"霍山震情窗"的动力学背景进行了研究,结果表明该震情窗易受青藏块体强震活动的影响,从而出现开窗异常,其异常变幅相对较大;此外,震情窗所处区域应力场的波动变化也会导致开窗异常,其异常变幅则相对较小。上述2种动力学背景的开窗异常对华东地区中强地震均具有较好的预测意义。此外,在实际应用中应关注多种动力学背景的共同影响可能导致的开窗异常。

As a stress sensitive part of east China in Anhui,the＂Huoshan Seismic Window＂can reflect the regional stress field changes in the form of micro and small earthquakes. Based on the method of strain release,we discussed the dynamic backgrounds of the ＂Huoshan Seismic Window＂and its implications in this paper. The result showed that the ＂Huoshan Seismic Window＂appeared abnormal due to the impact of strong earthquakes of Qinghai-Tibetan block,and its anomalous amplitude varies larger than the impact of self-fluctuations of regional stress field. Based on the both dynamic backgrounds,the ＂Huoshan Seismic Windows ＂ has better predictive significance which may reflect moderately strong earthquakes in the east China.Moreover,in practical application,we should concern about the combined effect of multiple dynamic backgrounds of Huoshan area.