| 华北地壳应力场的基本特征 |
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| 引用本文： | 李钦祖.华北地壳应力场的基本特征[J].地球物理学报,1980,23(4):376-388. |
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| 作者姓名： | 李钦祖 |
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| 作者单位： | 河北省地震局 |
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| 摘 要： | 地壳应力场的研究是地震学中的一个基本课题。本文根据对四个方面资料的分析得到了华北地区（φ30°-41°N,λ105°-124°E）地壳应力场的基本特征。这些资料是:1.地震机制,包括1937年至1979年地震的断层面解和最近十多年中的小地震综合断层面解;2.地震时的地面裂缝;3.公元143年至1976年41次M≥6地震的等震线的长轴方位;4.某些大地震地区的大地测量结果。这是一个一致性相当好的应力场,其最大压应力轴为北东东向,最小压应力轴为北北西向,并且都近于水平向。 从一些大地震的观测事实来看,具有这种一致性应力场的范围要比华北地区大,在远离华北的地方,仍表现出同华北以内相似的地壳应力场。这个事实表明,上述地壳应力场的来源,不限于华北地壳内部,而同更大规模的构造运动有关。欧亚板块、印度洋板块同太平洋板块三者之间的相互作用,以及华北所处远离板块边缘的特殊位置,可能是造成该应力场特征的主要原因。
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| 关 键 词： | 地壳应力场 小地震 等震线 华北地区 综合断层面解 震源机制 大地震 地球物理学报 应力主轴 基本特征 |
| 收稿时间： | 1979-04-20 |
GENERAL FEATURES OF THE STRESS FIELD IN THE CRUST OF NORTH CHINA |
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| LI QlN-ZU.GENERAL FEATURES OF THE STRESS FIELD IN THE CRUST OF NORTH CHINA[J].Chinese Journal of Geophysics,1980,23(4):376-388. |
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| Authors: | LI QlN-ZU |
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| Affiliation: | Seismological Bureau of Hetei Province |
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| Abstract: | The study of stress field in the crust is a basic problem in earthquake study. The general features of the stress field in the crust under North China （φ30°-41°N, λ105°-24°E） were obtained from analysis of the following data: （l）earthquake me-chanisms which include, fault plane solutions of earthquakes which occurred during the period 1937-1979 and composite fault plane solutions of weaker earthquakes in a period of more than 10 years; （2） earthquake fractures appearing on the earth's sur-face at the time of earthquakes; （3） the directions of major axes of isoseismals of 41 earthquakes of M ≥ 6 in the time period from 143 to 1976; （4） geodetic results in regions of some major earthquakes. This is a fairly consistent stress field in which the maximum compressional axis is in the northeast-east direction and the minimum axis in the north-northwest direction, both axes being nearly horizontal.From the observations of several great earthquakes, the extent of this consistent stress field is larger than North China. For areas considerably removed from North China, the stress field in the crust is essentially the same, showing that the origin of the stress field is not restricted to the crust of North China but to the tectonic move-ment on a much larger scale. The interactions between the Eurasian Plate, the Indian Plate and the Pacific Plate and the particular location of North China which is far from the margins of the plates are probably the main causes of the characteristics of the stress field in the crust of North China. |
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