汶川8.0级地震前地震非均匀度时空演化特征

Space-time Evolution Characteristics of Seismic Inhomogeneous Degree before Wenchuan Earthquake

本文利用地震非均匀度方法对汶川8.0级地震开展了震例研究,较系统地分析了汶川地震前地震非均匀度的时空演化特征。研究结果表明,汶川地震前在震中及附近地区存在明显的地震非均匀度中短期异常,2001年2月23日雅江6.3级地震可能是汶川地震前的首发地震,具有前震指示意义;根据近期GL值时空演化图像,探讨了我国西南地区的震情发展趋势。

The seismic inhomogeneous degree （GL value） method is used to study Wenchuan earthquake, and the space-time evolution characteristics of the seismic inhomogeneous degree is systematically analyzed. The result shows that a middle and short-term GL value anomaly was obvious in Wenchuan and nearby areas before the Ms 8.0 earthquake. The Ms 6.3 earthquake in Yajiang on February 23r~ 2001 might be a precursor earthquake for Wenchuan earthquake. Based on the space-time evolutional pictures of GL value, the：earthquake trends in the southwest of China are discussed.