构造应力方向与震源机制解
DIRECTIONS OF TECTONIC STRESS AND SOLUTIONS OF EARTHQUAKE SOURCE MECHANISMS
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摘要: 本文根据二维模型实验的结果,探讨了地震波辐射图型、震源机制解以及构造应力方向之间的关系.地震波辐射图型取决于地震时震源介质运动的方式.它不但与震前存在的应力有关,而且依赖于震源区的地质条件等因素.根据岩石力学实验和我们实验的结果,可以认为,构造应力的主压应力方向要比震源机制解推断的释放主压应力方向更偏近断层面一些.Abstract: The relations between the radiation pattern of seismic waves, focal mechanism solution and the directions of the tectonic stress are investigated with the aid of the results of two-dimensional model experiments. The radiation pattern of seismic waves is dependent on the form of motion of the medium around the focus at the time of earthquake which is connected not only with the pre-existing stress before earthquake but also with other factors such as the geological conditions within the focal region. Based on the experimental results of rock mechanics as well as the results of our experiments, it can be assumed that the direction of the principal compres-sive tectonic stress is closer to the fault plane than the direction of principal com-pressive stress of release deduced from the focal mechanism solution.
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