| 关于海城地震震源模式的讨论 |
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| 引用本文： | 邓起东
,王挺梅
,李建国
,向宏发
,程绍平.关于海城地震震源模式的讨论[J].地质科学,1976,11(3):195-204. |
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| 作者姓名： | 邓起东 王挺梅 李建国 向宏发 程绍平 |
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| 摘 要： | 地震震源模式是对地震形成条件、孕育和暴发过程的认识,它是与地震预报密切相关的一个重要理论课题。讨论一个地震的震源模式应该解决震源应力场、发震构造和震源物理、化学过程等问题,解决这些问题的根本依据来源于震前、震时和震后所暴露出的各种实际材料。地震地质特征是认识这些问题的背景,模拟实验则为我们认识这些问题提供对比研究的线索。
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| 关 键 词： | , |
A DISCUSSION ON SOURCE MODEL OF HAICHENG EARTHQUAKE |
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| Deng Qidong,Wang Tingmei,Li Jianguo,Xiang Hongfa,Cheng Shaoping.A DISCUSSION ON SOURCE MODEL OF HAICHENG EARTHQUAKE[J].Chinese Journal of Geology,1976,11(3):195-204. |
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| Authors: | Deng Qidong Wang Tingmei Li Jianguo Xiang Hongfa Cheng Shaoping |
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| Abstract: | A synthesis of various materials concerned indicates that the stress field of Haicheng earthquake source has a principal compressive stress axis in azimuth N65°-E75°. One set of shear planes in azimuth N65°-70°W is tenso-torsional and sinis-trally arranged, another set in N20°E is compresso-torsional and dextrally arranged. This stress field is coincident with the regional tectonic stress field of North China since Tertiary.It is argued here that under the control of the regional tectonic stress field, in the tectonically "confluent" region, at which the two structural trends (NNE and NW) meet with but not cross each other, as well as at the highest point of the upwarped upper mantle, the increase in the shear stress along the NWW trending structure probably results in rupture of the top of the lower resistant layer and the overlying part of the Earth’s crust, leading to the occurrence of the Haicheng earthquake. Therefore, the seismogenic structure controlling the occurrence of this earthquake may be a NWW trending new fault with its horizontal displacement greater than that of the vertical. The fracture developed principally along a NW direction and terminated and controlled by the Niuju-Yougou deep fault of Lower Liahe River.Six stages of the process of development and occurrence of the Haicheng earthquake and characteristics of various precursory anomalies throughout the whole process are described. The mechanism of principal physio-chemical changes in this process has been discussed. It suggests that the effect of stress in the deep crust, the occurrence of fractures and dislocation, the heat generation, water flow and vaporization are the principal factors causing various seismic phenomena.Finally, the stress fields of the earthquake source, tectonic model of seismogenic structures and the process of development and occurrence of the Haicheng earthquake are diagrammatically illustrated. |
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| Keywords: | , |
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