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地质科学  2010, Vol. 45 Issue (04): 1011-1026    DOI:
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从地质特征分析成都主城区在地震中的安合性
陈杨 刘树根 倪师军 曹俊兴 邓斌 钟勇 孙玮 李智武
成都理工大学油气藏地质及开发工程国家重点实验室 成都 610059
Safety discussion on Chengdu city in earthquake according to geological features:Take Wenchuan earthquake as an example
Chen Yang Liu Shugen Ni Shijun CaoJunxing DengBing Zhong Yong Sun Wei Li Zhiwu
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059
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摘要 汶川MS 8.0大地震发生后,关于成都市主城区安全性的讨论一度十分激烈。本文从成都市及周边的基本地质构造和沉积特征入手,讨论成都市主城区在地震中的安全性问题。经过分析认为:川西坳陷刚性稳定的岩石圈结构决定了成都平原不会发生破坏性的大地震; 成都平原沉积盖层厚度大、质量佳、分布适宜决定了龙门山发生的地震不会对成都主城区造成巨大破坏。因此,面对天然地震,成都市主城区是安全的。
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关键词汶川地震 成都市主城区 龙门山 地质构造 沉积特征 安全性     
Abstract: The earthquake safety of the Chengdu city has been a focus issue since the Wenchuan big earthquake.This present paper will talk about the safety of Chengdu urban area in an earthquake based on the basic geological structures and sedimentary features in Chengdu and its neighborhood area.Devastating earthquakes usually occur at active huge fault belts,and are of repetitive.The lithosphere structure of western Sichuan depression(Chengdu plain)is rigid and stable.Being situated at Chengdu plain,Chengdu city is on a stable tectonic unit.There is no large fault under the city.There is no record about devastating earthquake in Chengdu plain in history.Thus,there is no any possibility for a devastating earthquake to occur at Chengdu city.Secondly,Chengdu plain has a thick,good and welldistributed sedimentary cover,which determines that any earthquake occurs in Longmenshan can not make fatal damage to Chengdu urban area.The strata under Chengdu plain are composed up of four layers: 1)The PreSinian basement,whose surface is buried 11 kilometers and is the deepest in Sichuan Basin; 2)Upper SinianMiddle Triassic marine carbonates with the thickness of 4 000 m to 5 000 m; 3)Uupper TriassicCretaceous continental clastic rocks with the thickest thickness of 5 000 m to 6 000 m in Sichuan Basin.This strata texture is “the protection god” warding the Chengdu city off being ruined by Wenchuan earthquake.Because the rigidity of the strata becomes smaller and smaller from the bottom to the top,their ability absorbing the seismic energy resulted by earthquakes is bigger and bigger.This makes the seismic waves from Longmen Mountain earthquakes very weak with no destroy energy when they propagated to Chengdu city.Therefore,Chengdu city is safe to the earthquakes which happen in Longmen Mountains.There,faced with natural earthquake,Chengdu urban area are safe.
Key wordsWenchuan earthquake Chendu urban area Longmen Mountains Geology structure Sedimentary feature Safty   
收稿日期: 2009-09-06; 出版日期: 2010-10-25
基金资助:都市科技计划项目“成都市构造活动分析与地震安全性评价研究”(编号: 08YTZD996ZF014)资助。
引用本文:   
. 2010, 从地质特征分析成都主城区在地震中的安合性. 地质科学, 45(04): 1011-1026.
. Safety discussion on Chengdu city in earthquake according to geological features:Take Wenchuan earthquake as an example[J]. Chinese Journal of Geology, 2010, 45(04): 1011-1026.
 
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