包代河断裂古地震初步研究
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摘要
包代河断裂是 1 954年山丹 7 级地震的主破裂带 ,为右旋正倾滑断裂 ,长约 4 .5km .经开挖探槽在该断裂上揭露出三次古地震事件 ,分别发生在距今约 31 2 0± 2 50a后 ;2 50 0± 1 90a左右 ;2 1 50± 1 70a之后 ,古地震重复间隔约 350～ 70 0年 .
The Baodaihe fault is the main seismic rupture zone of 1954 Shandan earthquake(M =71/4), which shows right lateral strike slip movement with a small portion of dip slip component. The fault is about 4.5 km long. For the first time ,three paleoearthquake events can be identified in the trench cross the Baodaihe fault. According to the 14 C and TL age date of the strata in the trench, the first event occurred later than 3 120 ±250 a B.P., the second one took place approximately 2 500±1 70 a B.P., and the third one occurred later than 2 150 ±170 a B.P., the recurrence interral of great earthquake along the fault is approximately 350～700 years.
The Baodaihe fault is the main seismic rupture zone of 1954 Shandan earthquake(M =71/4), which shows right lateral strike slip movement with a small portion of dip slip component. The fault is about 4.5 km long. For the first time ,three paleoearthquake events can be identified in the trench cross the Baodaihe fault. According to the 14 C and TL age date of the strata in the trench, the first event occurred later than 3 120 ±250 a B.P., the second one took place approximately 2 500±1 70 a B.P., and the third one occurred later than 2 150 ±170 a B.P., the recurrence interral of great earthquake along the fault is approximately 350～700 years.
引文
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[3] 国家地震局《阿尔金活动断裂带》课题组.阿尔金活动断裂带[M ].北京:地震出版社,1992.218—226.
[4]何文贵.龙首山北缘活动断裂与1954年山丹7级地震[C].见:中国八级大震研究及防震减灾学术会议论文集[A].北京:地震出版社,2001.224—230.
[5]丁国瑜.全新世断层活动的不均匀性[J].中国地震,1990,6(1):1—9.
[6] XuXiwie,DengQidong.NonlinearcharacteristicspaleoseismicityinChina[J].J.G .R .,1996,101(B3):6209—6231.
[7]闵伟,张培震,邓起东,等.强震原地重复模型在板内地震危险性概率评估中的不确定性分析[C].见:活动断裂研究(8)[A].北京:地震出版社,2001.50—55.
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