Abstract: Gyaring Co fault zone across Xainza and central Tibet had been formed before late Cretaceous period,and has been reactivated with right lateral motion since Quaternary.The fault zone consists of four subparallel faults in an arrangement of right stepping en echelon,and three pull-apart basins,occupied by Zigui Co,Gyaring Co and Waang Co respectively,are formed in righ-step like.Gyaring Co fault zone is one of main seis-mogenic fault in central Tibetean plateau.At least four surface ruptures associated with earthquake have occurred clearly along the fault zone since Holocene,with the segmentation of activity along the fault zone.

Key words: Tibet, Gyaring Co fault, Segmentation of activity, Seismogenic fault

摘要： 格林错断层带是一条晚白垩纪以前形成,第四纪以来具明显活动性质的右旋走滑断层。断层带由4条次级走滑断层呈右行右阶羽列排列而成,在两条次级走滑断层的连接部位分别形成孜桂错、格林错、瓦昂错拉分区。格林错断层带是西藏中部地区的主要发震断层之一,全新世以来,至少有4期地震地表破裂沿该断层带发生。第四纪晚期,断层具明显的分段活动性质,并且断层活动有从北西向南东、向南迁移的迹象。

关键词: 西藏, 格林错断层带, 分段活动, 发震断层