1997年青海省震群活动的某些特征

THE CHARACTERISTICS OF EARTHQUAKE SWARMS FROM DEC.1996 TO JULY,1997 IN QINGHAI PROVINCE

摘要:

对青海省1996年12月～1997年7月发生的4起震群活动的特征进行了研究,对其空间分布图象进行了分析.结果表明,锡铁山震群和大武震群为前兆性震群,龙羊峡震群和茫崖震群为非前兆震群.4起震群在总体上形成NW向条带.根据震群的总体特点及地震空区等,讨论了青海省近期地震活动趋势.

Abstract:

The characteristics of four swarms from Dec. 1996 to July 1997 in Qinghai province are studied.The seismicity patterns are analysed. The results show that Xitieshan swarm and Dawu swarm are precursory swarms, and Longyangxia swarm and Mangya swarm are unprecursory swarms. Distribution of the swarms and two earthquakes constitutes a NW belt in the spacial distribution. Based on the total characteristics of swarms and seismic gap and so on,the seismic trend in recent time of Qinghai province is preliminarily discussed.