10余年来甘肃省中强地震的发震构造特征  

The Characteristics of Seismogenic Structure of Middlestrong Earthquakes in Recent 10 Years,Gansu Province

作　　者：袁道阳[1] 何文贵[2] 刘小凤 郑文俊[2] 葛伟鹏[2] 刘兴旺[2] 

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]中国地震局地震预测研究所兰州科技创新基地,甘肃兰州730000 [3]甘肃省地震局,甘肃兰州730000

出　　处：《西北地震学报》2006年第3期235-241,共7页Northwestern Seismological Journal

基　　金：国家自然科学基金(40372086);甘肃省科技攻关项目(2GS054-A44-015);中国地震局"南北地震带中强地震短临跟踪"项目资助;中国地震局兰州地震研究所论著号:LC20060017

摘　　要：归纳总结了1995年以来甘肃省所发生的9次MS5.0以上破坏性地震的发震构造特征,综合分析了其共性和个性特点。结果表明:所发生的中强破坏性地震大多位于活动性较弱的次级活动断裂带上或主干活动断裂带边缘,其分布具有时间上的分段性、空间上的分区性和迁移性特点,并具有从山前向盆地内部扩展的发展趋势。The characteristics of seismogenic structure and tectonic backgrounds of 9 Ms≥ 5. 0 earthquakes occured in Gansu Province since 1995 are summarized, the generalities and distinctive features of the structures are analyzed. The results indicate that： most of the middle-strong earthquakes in recent 10 years in Gansu main occured on the secondary active fault zones, where activity is weak, or on the edge of main fault zones. The earthquake are results of regional stress field adjustment, and their characteristics are occuring by stages in time, distributing in divisional zones in space and migrating from the front of Mountain to the interior of thrust basins.

关 键 词：中强地震 发震构造 甘肃 

分 类 号：P315.2[天文地球—地震学]