祁连山北缘佛洞庙-红崖子断裂古地震特征初步研究  

Preliminary Study of Palaeo-earthquakes on the Fodongmiao-hongyazi Fault in the North Margin of Qilian Mountain

作　　者：刘兴旺[1,2,3] 袁道阳[1] 何文贵[1,2] 

机构地区：[1]中国地震局兰州地震研究所,兰州730000 [2]中国地震局地震预测研究所兰州科技创新基地,兰州730000 [3]兰州大学西部环境教育部重点实验室,兰州730000

出　　处：《震灾防御技术》2014年第3期411-419,共9页Technology for Earthquake Disaster Prevention

基　　金：中国地震局地震预测研究所基本科研业务专项(2009A20)资助

摘　　要：佛洞庙-红崖子断裂位于祁连山北缘断裂带中部,是祁连山与河西走廊之间的一条重要边界断裂,断裂全长约110km,总体走向北西西,该断裂为一条全新世活动的逆-左旋走滑断裂,断裂活动形成了一系列陡坎、断层崖以及冲沟和阶地左旋等断错地貌。本文通过3个探槽剖面对发生在该断裂上的古地震事件进行了分析,可确定地震事件2次,事件I为历史地震,发生在距今400年前,为1609年红崖堡7■级地震;事件II的年代为距今(6.3±0.6)ka B.P.和(7.4±0.4)ka B.P.之间。同时结合前人的一些研究资料,对古地震的复发模式和间隔进行了初步讨论。Fodongmiao-hongyazi fault lies in the middle part of the north fault zone of Qilian mountain.It is an important boundary fault between Qilian mountain and Hexi-corridor.The main trending of the fault is NWW with length of 110 km.The fault is active in Holocene period with left-lateral reverse strike-slip movement.The activity of the fault formed a series of geomorphology like fault scarp,terrace and gully left-lateral.In this paper,we report two earthquake events that were identified from three trenching survey along the fault.Event Ⅰ is a historic earthquake occurred in four hundred years ago,namely Hongyapu M71/4 in 1609.Event Ⅱ occurred between （6.3±0.6） ka B.P.and （7.4±0.4） ka B.P..Combined with the previous studies,we discussed the recurrence model and interval of the palaeo-earthquakes along the fault.

关 键 词：佛洞庙-红崖子断裂 古地震 地震复发间隔 

分 类 号：P315[天文地球—地震学]