西南地区强震前后地壳变形异常强度场特征研究

采用标准化的F统计量给出了异常强度的定量描述方法,在变形监测台点比较密集的西南地区构造了变形异常强度场。通过对异常特征空间分布随时间演化图像及强地震前后变形异常分布图像的研究,讨论了地震成组活动模式下变形空间分布的特点及变形异常分布的非均匀性特征。探讨了变形异常集中区与平静区(变形空区)与地震活动空区之间的关系,以及地震活动空区内外小震活动与变形场分布之间的微动态联系。

On the characteristics of anomaly deformation field around strong earthquakes in Southwest China area

In this paper, an anomaly intensity is proposed based on the Fisher statistic quantity, and the anomaly intensity field for deformation is also created in the Southwest China area at denser monitoring sites. Analyzing the anomaly pattern, the inhomogeneous characteristics and its evolution are discussed under assuming the seismic activity in group. The relation between deformation anomaly- concentrated area (or deformation gap) and seismic gap, and the relation between seismic activity and anomaly intensity field within and outside the seismic gap are explored.