| 青藏高原东缘重力导纳模型均衡异常时空特征 |
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| 引用本文： | 陈石,王谦身,祝意青,蒋长胜,王武星,卢红艳,刘端法,郭凤义.青藏高原东缘重力导纳模型均衡异常时空特征[J].地球物理学报,2011,54(1):22-34. |
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| 作者姓名： | 陈石 王谦身 祝意青 蒋长胜 王武星 卢红艳 刘端法 郭凤义 |
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| 作者单位： | 1. 中国地震局地球物理研究所,北京 100081;
2. 中国科学院地质与地球物理研究所,北京 100029;
3. 中国地震局地震预测研究所,北京 100036;
4. 中国地震局第二监测中心,西安 710054 |
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| 基金项目： | 科技部地震行业科研专项重大项目，国家自然科学基金项目，中国地震局地球物理研究所基本科研业务专项 |
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| 摘 要： | 青藏高原东缘地处南北地震带,在卫星自由空气重力异常图上对应明显的正负异常梯级带变化特征,沿着异常梯级带分布多条深大断裂,属于构造单元的边界区域.本文利用重力导纳分析方法,计算了该区重力导纳模型均衡异常背景场;通过与Airy模型和弹性板模型的均衡重力异常特征对比,结合地震活动性分布特点,评价均衡重力异常计算结果和选择计算...
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| 关 键 词： | 龙门山断裂带 重力导纳 Airy模型 弹性板模型 流动重力测量 均衡重力异常 |
| 收稿时间： | 2010-08-31 |
Temporal and spatial features of isostasy anomaly using gravitational admittance model at eastern margin of Tibetan Plateau |
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| CHEN Shi,WANG Qian-Shen,ZHU Yi-Qing,JIANG Chang-Sheng,WANG Wu-Xing,LU Hong-Yan,LIU Duan-Fa,GU Feng-Yi.Temporal and spatial features of isostasy anomaly using gravitational admittance model at eastern margin of Tibetan Plateau[J].Chinese Journal of Geophysics,2011,54(1):22-34. |
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| Authors: | CHEN Shi WANG Qian-Shen ZHU Yi-Qing JIANG Chang-Sheng WANG Wu-Xing LU Hong-Yan LIU Duan-Fa GU Feng-Yi |
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| Institution: | 1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
3. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;
4. Second Crust Mointoring and Application Center, China Earthquake Administration, Xi'an 710054, China |
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| Abstract: | Eastern margin of Tibetan plateau belongs to north-south seismic belt. There is a distinct variation characteristic of gradient zone of positive and negative anomaly on satellite anomaly figure of free air gravity. Along the anomaly zone, there are many deep faults. The eastern margin is also a boundary region of tectonic units. In this paper, we used the gravitational admittance theory and method to compute the background isostasy anomaly of gravitational admittance model in this region. Through comparing the isostasy anomaly characteristics of Airy model and elastic plate model and analyzing the regional seismic activity, we evaluated the results and optimized the parameter used for calculation. Based on this, we finished the comparison and analysis of isostasy anomaly response characteristics along three profiles across the eastern margin of Tibetan plateau, and taking this isostasy anomaly background as the reference field, further explained the temporal and spatial features of mobile gravity measurement dataset of 1998~2005. |
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| Keywords: | Longman mountains fault zone Gravitational admittance Airy model Flexural plate model Mobile gravity gurveying Isostasy gravity anomaly |
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