| 我国几个大地震地区地壳与上地幔顶部结构关系的初步分析 |
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| 引用本文： | 魏斯禹,滕吉文.我国几个大地震地区地壳与上地幔顶部结构关系的初步分析[J].西北地震学报,1985,7(2):77-84. |
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| 作者姓名： | 魏斯禹 滕吉文 |
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| 作者单位： | 中国科学院地球物理研究所
(魏斯禹)，中国科学院地球物理研究所(滕吉文) |
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| 摘 要： | 本文根据我国境内及邻近地区地壳结构的分布特征,特别是近年来我国发生的几个大地震所处的深部地壳构造背景,讨论了地震孕育与发生的可能构造模式。结果表明,近代地震活动地带均为地壳厚度急剧变化的地带和地壳构造的转折交汇部位。在深部构造上又为上地幔顶部局部的隆起地区及邻近隆起地带的边缘或斜坡上。此外,地震发生的深部部位与重力场、磁力场的高梯度变化以及地壳中的低电阻层、低速层和高速层的分布密切相关。这种与地震有关的深部构造背景与地球物理场特征,是今后地震预报和地震成因研究必须十分重视的。
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| 收稿时间： | 1983/5/3 0:00:00 |
THE PRELIMINARY STUDY OF THE RELATION BETWEEN CRUST AND TOP STRUCTURE OF UPPER MANTLE IN SEVERAL LARGE EARTHQUAKE AREAS IN CHINA |
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| Wei Siyu and Teng Jiwen.THE PRELIMINARY STUDY OF THE RELATION BETWEEN CRUST AND TOP STRUCTURE OF UPPER MANTLE IN SEVERAL LARGE EARTHQUAKE AREAS IN CHINA[J].Northwestern Seismological Journal,1985,7(2):77-84. |
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| Authors: | Wei Siyu and Teng Jiwen |
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| Institution: | Institute of Geophysics, Academia Sinica and Institute of Geophysics, Academia Sinica |
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| Abstract: | Based on the crust structure in China and its vicinity areas, especially background of deep crust structure where some large earthquakes took place in recent years, this paper discusses the possible structure model for the occurrence of earthquakes.The results show that all modern seismicity occurred in the places where the thickness of crust changed rapidly or the structure twisted; Moreover, in these areas shocks would exist on the slopes or fringes of lifting parts of top upper mantle and other lifting areas nearly. In these spots the stress easily accumulates and breaks take place frequently.This is the deep structure background of occurrence of earthquakes Furthermore, the areas where deep earthquakes take place are closely related to the high gradient variation of gravity field, magnetic field, and to low resistance layers, low and high velocity layers.This kind of relation between earthquakes and deep geological structure as well as features of geophysical fields must be envisaged in the earthquakes prediction and in searching for their origin. |
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