| 四川中西部地区地壳结构与重力均衡 |
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| 引用本文： | 王谦身,滕吉文,张永谦,张雪梅,杨辉.四川中西部地区地壳结构与重力均衡[J].地球物理学报,2009,52(2):579-583. |
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| 作者姓名： | 王谦身 滕吉文 张永谦 张雪梅 杨辉 |
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| 作者单位： | 中国科学院地质与地球物理研究所， 北京 100029 |
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| 基金项目： | 国家科技支撑计划，国家重点基础研究发展规划(973计划) |
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| 摘 要： | 汶川MS8.0地震的“孕育”、发生和发展是深部物质分异、调整和运移的产物.为此，在四川中西部地区（松潘—甘孜，龙门山断裂系和四川盆地）应用重力布格异常场资料并通过两条典型剖面的地壳厚度(Moho界面深度）分布与依据Airy均衡理论给出的理论均衡地壳厚度做对比分析,探讨四川盆地、龙门山造山带、邛崃山等川西地域的地壳均衡状态，得到龙门山及其以西地带的深部地壳结构.龙门山造山带恰处于很不均衡的状态，即与其西北和东南部相比差异明显，故地壳处于不稳定状态.为探讨该区重力场均衡与强烈地震活动之间的关系，还必须进行新一轮的高精度观测，以对该区深部精细结构、重力场效应和均衡补偿深入研究.此外，本文研究结果有益于震后确定城镇布局和为不同类型建筑物重建选址提供深部要素.
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| 关 键 词： | 汶川MS8.0地震 深部物质运移 地壳结构 布格异常 重力均衡 |
| 收稿时间： | 2008-10-23 |
| 修稿时间： | 2008-12-8 |
The crustal structure and gravity isostasy in the middle western Sichuan area |
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| WANG Qian-Shen,TENG Ji-Wen,ZHANG Yong-Qian,ZHANG Xue-Mei,YANG Hui.The crustal structure and gravity isostasy in the middle western Sichuan area[J].Chinese Journal of Geophysics,2009,52(2):579-583. |
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| Authors: | WANG Qian-Shen TENG Ji-Wen ZHANG Yong-Qian ZHANG Xue-Mei YANG Hui |
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| Institution: | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029,China |
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| Abstract: | The genearation, occurrence and development of Wenchuan MS8.0 great earthquake was the product of decomposition, adjustment and movement of the deep material. Therefore, two profiles of crustal thickness M are obtained by using the data of Bouguer gravity anomalies. The deep crustal structures around Longmen Shan mountain fault system and its adjacent area are obtained. Meanwhile, the theoretic isostatic crustal thickness D are obtained according to Airy′s isostatic theory, to research the crustal isostatic state in Sichuan Basin, Longmen Shan, Qionglai Shan and western Sichuan mountains area. After that, the distributions of D and M in this area are compared mutually. The results indicated that Longmen Shan orogenic zone is in a very non-isostatic state, i.e., the crust is in a unstable state. There obvious differences between the orogenic zone and its north-west or south-east parts are existed. The precise deep structure, effect of gravity field and isostatic compensation must be researched, for the study of the relationship of gravity field effect and strong earthquakes.This research result may provide deep factors for the selection of location, re-construction of buildings, layout of towns and villages after earthquake. |
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| Keywords: | Wenchuan MS8 0 violent earthquake Movement of the deep material Crustal structure Bouguer anomaly Gravity isostasy |
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