2006年温州珊溪水库地震序列特征

Seismic Sequence Characteristics of the 2006 Shanxi Reservoir Earthquake in Wenzhou

通过分析2006年2月温州珊溪水库地震序列的时空强分布特征,得到该序列具有①频度高、衰减慢、持续时间长;②震中分布集中且呈北西向展布;③震源浅;④各台站P波初动符号基本保持不变;⑤较大地震发生前,空间上出现空段,时间上表现为“增强—平静—发震”;⑥h值先变小后变大,b值缓慢变大等特点。结合地震应急时的预报实践,重点研究了地震趋势判断中比较有效的指标或参量,希望能为以后珊溪水库地震趋势的预报提供借鉴。

In this paper, the characteristics of time-space and intensity distribution of the 2006 Shanxi reservoir earthquake sequence in Feb. 2006 were analyzed. The characteristics of the sequence are as follows： ① High frequency, slow attenuation, long duration; crowded in a northwest belt; ② Shallow seismic source; every station; ③ The epicenters Unchanged P wave first motion of Before relatively great earthquake, gap segment appeared in time domain, the trend of ＂strengthen-quietude-occur＂ appeared in time domain; ④ h value becoming small first and big then, b value becoming big slowly. Combined with practice during earthquake emergency, more effectual parameters in earthquake trend estimation were researched, and hoping it can be used as reference for Shanxi Reservoir earthquake trend estimation in the future.