新疆伽师强震群与其他典型强震群对比研究  

CONTRASTIVE STUDY ON JIASHI STRONG EARTHQUAKE SWARM IN XINJIANG AND OTHER TYPICAL STRONG EARTHQUAKE SWARMS

作　　者：王筱荣[1] 孙甲宁[1] 王季达[1] 

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011

出　　处：《内陆地震》2006年第2期121-130,共10页Inland Earthquake

基　　金：新疆维吾尔自治区科技攻关项目(200333116-3);国家科技攻关项目(2004BA601B01-04-01)资助

摘　　要：对比研究了国内、外9次6级以上强震群,发现强震群序列具有强度大、频度高、中强余震频繁、余震衰减起伏大、持续时间长、中强震前小震活动显示平静的特点。与主余型地震相比震群型地震b值大、p值小,最后一次主要地震发生后序列衰减变慢,多数地震的余震具有共轭分布特征,主要地震的震源深度和破裂方向呈多样性,地震破裂具有继承性。新疆伽师强震群与乌兹别克斯坦加兹里强震群不但在分段上极为相似,而且随时间的发展在能量释放的分配形式上也极为相似,且余震都呈共轭分布,主要地震迁移呈多侧扩展型,强震前中、小地震表现平静。从频度及强度上看,这两次强震群第一组强震发生后余震频度及强度较低,第二组强震发生后余震频度及强度较高,第三组强震发生后余震频度及强度最高。The article studies 9 strong earthquake swarms of with the magnitude Ms≥6.0 at home and abroad, which shows strong earthquake swarm sequence is characteristics of great magnitude and high frequency, frequent mid-strong aftershocks, and aftershock decay fluctuating and lasting long time, small earthquake activity quiescence before mid-strong earthquake. Comparing with main-aftershock type earthquake, swarm is characteristics of big b value and small p value, and sequence decay is getting slow after the last major earthquake, and the aftershocks of most earthquakes distribute in conjugated shape, and focus depth and rupture direction of major earthquake are diverse, and rupture is successive. Jiashi strong earthquake swarm of Xin Jiang is similar to Jazily strong swarm of Uzbekistan, not only time stage of seiesmicity, but distributing form of energy release with time, and aftershocks distribute in conjugated shape. Migration of major earthquake extends to multi-sides, and mid-small earthquakes appear quiescent before strong earthquakes. According to frequency and strength, aftershock frequency and strength are weak after the first group strong earthquakes of the two strong earthquake swarm, and high after the second group ones, and highest after the third group ones.

关 键 词：强震群 伽师强震群 序列时空分布特征 新疆 

分 类 号：P315.5[天文地球—地震学]