| 大震与重力异常突变带、活动断裂带关系及其流变模型 |
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| 引用本文： | 周志鹏,杜秋姣,梁青,王杰,曾佐勋,王雄.大震与重力异常突变带、活动断裂带关系及其流变模型[J].地球科学,2014,39(12):1887-1895. |
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| 作者姓名： | 周志鹏 杜秋姣 梁青 王杰 曾佐勋 王雄 |
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| 作者单位： | 1.中国地质大学地球科学学院, 湖北武汉 430074 |
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| 基金项目： | 理科基地人才培养基金项目，国家自然科学基金重点项目，国家自然科学基金青年科学基金项目，中国博士后科学基金面上项目，国家“985”创新平台建设项目子方向课题 |
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| 摘 要： | 为了研究大震(Ms≥7)和巨震(Ms≥8)与重力异常和活动断裂的关系.利用EIGEN-6C重力模型计算了相关地区的自由空气重力异常, 查阅了相关地区的布格重力异常和活动断裂构造.分析了重力异常突变带和活动断裂带与这些地震的空间分布.发现大震和巨震常在重力异常突变带和活动断裂带交汇处发生.结合前人对地球深部构造特征的研究, 提出了一种流变模型来解释大地震发生于重力异常突变带和活动断裂带交汇处的原因: 地壳深部流变层(体)流动受阻碍而引起重力异常和能量积累与释放.
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| 关 键 词： | 大地震 重力异常突变带 活动断裂带 深部构造 流变 |
| 收稿时间： | 2014-09-01 |
Relationship among Steepest Gradient of Gravity Field,Active Fault Zone and Large Earthquake,and Its Rheological Model |
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| ZhouZhipeng,DuQiujiao
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LiangQing,WangJie
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ZengZuoxun,WangXiong.Relationship among Steepest Gradient of Gravity Field,Active Fault Zone and Large Earthquake,and Its Rheological Model[J].Earth Science-Journal of China University of Geosciences,2014,39(12):1887-1895. |
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| Authors: | ZhouZhipeng DuQiujiao LiangQing WangJie ZengZuoxun WangXiong |
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| Abstract: | In order to find the relationship among a large (Ms≥7) earthquake, or a giant earthquake (Ms≥8) and the steepest gradient of gravity field and active fault, the free air gravity anomaly map by EIGEN-6C gravity model was calculated, the bouguer gravity anomaly and active fault of the region trends to occur large or giant earthquake is consulted. The spatial distribution of large and giant earthquakes and active fault, gravity anomaly is analyzed. We come to a conclusion that a large or giant earthquake trends to occur at the intersection area of steepest gradient of gravity field and active fault. With the previous study of deep structures in those area, we propose a rheological model to interpret the regularity. It is that the flow of the rheological layer (body) blocked by the brittle rocks cause the gravity anomaly and energy accumulation and release. |
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| Keywords: | large earthquake steepest gradient of gravity field active fault zone deep structure rheology |
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