兰州马衔山北缘断裂地震潜势评估

英文篇名：Seismic Risk Estimates for the Maxianshan North-margin Fault
中文刊名：西北地震学报
英文刊名：Northwestern Seismological Journal
作者：梁明剑 ; 袁道阳 ; 刘百篪 ; 雷中生
英文作者：LIANG Ming-jian1 ; 2 ; YUAN Dao-yang1 ; 2 ; LIU Bai-chi1 ; 2 ; LEI Zhong-sheng1 ; 2(1.Lanzhou Base of Institute of Earthquake Science ; China Earthquake Administration ; Lanzhou 730000 ; China ; 2.Lanzhou Institute of Seismology ; China Earthquake Administration ; Lanzhou 730000 ; China)
中文关键词：兰州 ; 马衔山北缘断裂 ; 平均复发间隔 ; 地震潜势
英文关键词：Lanzhou ; Maxianshan north-marginal fault ; Average recurrence interval ; Risk estimates of earthquake
出版日期：2008-12-30
机构：中国地震局兰州地震研究所;中国地震局地震预测研究所兰州科技创新基地;
年：2008
期：04
出版单位：西北地震学报

摘要

马衔山北缘断裂为晚第四纪活动的左旋逆走滑断裂,是对兰州市影响最大的控震断裂,自东向西可分为内官营段、马衔山段、七道梁段和雾宿山段4条次级断层段。其中雾宿山段为1125年兰州7级地震的发震断层段,其特征地震平均复发间隔为2 250~3 590年,最晚离逝时间为882年,在未来关注的200年内再次发生强震的可能性较小;马衔山段特征地震平均复发间隔约为3 120年,历史上曾发生过多次中等破坏性地震,其潜在地震危险性值得关注;七道梁段和内官营段未获得古地震复发间隔等参数,但历史上均发生过中等破坏性地震,未来仍存在中等破坏性地震发生的可能,其地震复发间隔可近似地参考马衔山断裂带上相应震级地震的平均值。
The Maxianshan north-margin fault is a left-lateral reverse strike-slip fault during late Pleistocene to Holocene periods,and it primarily controls seismicity of Lanzhou city.From west to east,it can be divided into 4 segments:Wusushan,Maxianshan,Qidaoliang and Neiguanying segment.Wusushan segment is the seismogenic structure of Lanzhou M7.0 earthquake in 1125,and the average recurrence interval of its characteristic earthquakes is 2 250～3 590 a.Considering only 882 years have elapsed since 1125,probability of another strong event is low during future 200 years.Average recurrence interval on Maxianshan segment is about 3 120a,and there were several moderate destructive earthquakes occurred on it in history.So we should pay attention to the potential seismic risk on this segment.The paleo-earthquake recurrences interval on Qidaoliang segment and Neiguanying segment are not obtained yet,but moderate-strong earthquakes have occurred on them in history,and will occur in future.The recurrence of earthquakes on them can make reference to Maxianshan north margin-fault′s approximately.

引文

[1]袁道阳,雷中生,刘百篪,等.兰州1125年7级地震考证与发震构造分析[J].中国地震,2002,18(1):67-75.
    [2]袁道阳,刘小凤,郑文俊,等.兰州地区活动构造格架与变形特征[J].地质学报,2004,78(5):626-632.
    [3]宋方敏,袁道阳,陈桂华,等.甘肃马衔山北缘断裂西北段几何结构及其新活动[J].地震地质,2006,28(4):547-560.
    [4]J N Brune.Seismic moment,seismicity,and rate of slip along ma-jor fault zones[J].J.Geophys.Res.,1968,73:777-784.
    [5]闻学泽.活动断裂地震潜势的定量评估[M].北京:地震出版社,1995.
    [6]闻学泽.准时间可预报复发行为与断裂带分段发震概率估计[J].中国地震,1993,9(4):289-300.
    [7]张培震,毛凤英.活动断裂定量研究与中长期强地震危险性概率评价[A]∥活动断裂研究理论与研究(5)[G].北京:地震出版社,1996,3-12.
    [8]Wesnousky S G.Integration of geological and seismiological datafor the analysis of seismic hazard:case study of Japan[J].Bull.Seism.Soc.Am.,1984,74:687-708.
    [9]闻学泽.中国大陆活动断裂段破裂地震复发间隔的经验分布[J].地震学报,1999,21(6):616-622.
    [10]毛凤英,张培震.古地震研究中的逐次限定法与新疆北部主要断裂带的古地震研究[A]∥活动断裂研究(4)[G].北京:地震出版社,1995:153-164.
    [11]Nishenko SP,Buland R.A generic recurrence interval distribu-tion for earthquake forecasting[J].Bull.Seism.Soc.Am.,1987,77:1382-1399.
    [12]甘卫军,刘百篪,黄雅虹.板内大震原地准周期复发间隔的概率分布[J].西北地震学报,1999,21(1):7-16.
    [13]Cornell C A..Engineering seismic risk analysis[J].Bull.Seism.Soc.Am.,1968,58(5):1583-1606.
    ②闻学泽.中强—弱及隐伏活动断层的现今活动习性与地震危险性评价方法.2007.
    ①袁道阳.兰州市活断层探测与地震危险性评价工程技术报告.2007.