| 地壳下部及上地幔物质分异作用对地震成因机制的影响 |
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| 引用本文： | 陈家超,刘江.地壳下部及上地幔物质分异作用对地震成因机制的影响[J].西北地震学报,1985,7(1):75-81. |
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| 作者姓名： | 陈家超 刘江 |
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| 作者单位： | 广东省地震局，广东省地震局 |
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| 摘 要： | 本文着重从物质分异的角度讨论了板块俯冲带及大陆地壳内某些地震成因机制问题。认为由于构造的活动和地球自转速度不均匀,在深大断裂带附近的上地幔或玄武岩层顶部容易产生分异的底辟构造。这种构造上隆引起的垂直作用力可促使地面产生同步隆起和侧翼相对下降,地震的震源往往位于底辟构造的侧翼或顶部。一般由底辟构造形成的垂直作用力与水平向区域构造应力场叠加成为一种叠加震源应力场。
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| 收稿时间： | 1984/3/1 0:00:00 |
THE INFLUENCE OF THE DIFFERENTIATION OF THE UPPER MANTLE AND THE LOWER PART OF CRUST ON THE EARTHQUAKE MECHANISM |
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| Chen Jiachao and Liu Jiang.THE INFLUENCE OF THE DIFFERENTIATION OF THE UPPER MANTLE AND THE LOWER PART OF CRUST ON THE EARTHQUAKE MECHANISM[J].Northwestern Seismological Journal,1985,7(1):75-81. |
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| Authors: | Chen Jiachao and Liu Jiang |
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| Institution: | Seismological Bureau of Guangdong and Seismological Bureau of Guangdong |
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| Abstract: | This paper accents the influence of the differentiation of plate subdu-ction zone and the interia of crust on earthquake mechanism.It holds that because of structure motion and the heterogeneity of the earth rotation velocity,the different diapire structure is apt to be formed at the top of basalt or the upper mantle near abyssal faults.The vertical force caused by such an uplift can make ground surface form synchronous rise and la-teral fall,and epicenter is often considered to lie in the sides or at the top of diapire structure.A superimposed epicenter stress field is made of the superimposition of the horizontal structure stress field and the verti-cal force of diapire structure. |
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