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本文在列述了大量无震异常事实后提出,无震异常与有震异常,都是现代地壳运动的结果和表现之一。我们用考古和云南地区大地测量资料,论证了现代地壳运动速度和幅度,时、空场上所呈现的不均匀性和突发性特征。并认为无震异常空间分布的不均匀性、时间分布上的突发性特征与此有关。作者认为,现代地壳运动速度和幅度空间分布的不均匀性特性,是由于地壳结构不均匀,在构造应力场作用下某一地区同时产生多个应力集中程度差别甚大的应力集中区所引起的。无震异常的形成,乃是区域应力场在调整过程中,原来的应力集中区(可能出现异常的地区)转换为应力松驰区的结果。
After a large number of anomalous earthquakes have been listed, this paper proposes that both anomalous earthquakes and anomalous earthquakes are all the results of modern crustal movement. We use the archeological and geodetic data from Yunnan to demonstrate the velocity and amplitude of the modern crustal movement, the inhomogeneous and unexpected characteristics of the space and time fields. And it is considered that the spatial distribution of anomalous anomalous anomalies is inhomogeneous, and the sudden features of time distribution are related to this. The author thinks that the inhomogeneity of the velocity and amplitude spatial distribution of the modern crustal movement is caused by the uneven crustal structure and the simultaneous generation of multiple stress concentration zones with different degrees of stress concentration in a certain area under the action of tectonic stress field. The formation of anomalous anomalies is the result of the transformation of the original stress concentration area (where anomalous areas may appear) into the stress relaxation area during the adjustment of the regional stress field.