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通过对武都应变台多年应变资料的处理分析后发现,在汶川8.0级地震发生前,武都台应变有显著的前兆异常变化,它与昆仑山口西8.1级地震前出现的异常有很高的相似度。昆仑山口西地震和汶川地震前都有“α-β-γ”形变阶段,在不同的前兆异常阶段,异常形态有明显的差异,而且各具特点。尤其在β1阶段,EW道、面应变、差应变的异常变化(中期异常)都出现在震前2—3年,持续时间约1年多,而且异常都非常显著。本文详细分析了武都台应变在各个阶段的前兆异常变化特征,并就其原因进行了初步分析。
Through the analysis and treatment of the strain data of Wudu Strain Station for many years, it is found that there was a significant change of precursory anomalies in the strain of Wudu Station before the Wenchuan M 8.0 Migration, which is very high before the M 8.1 M up to the west of the Kunlun Mountain Pass Similarity. Before the Kunlun Mountain Pass western earthquake and the Wenchuan earthquake, there was an “α-β-γ” deformation stage. There were obvious differences in the abnormal morphologies during different stages of precursor anomalies, and each had its own characteristics. Especially in the β1 stage, the anomalous changes of EW tract, surface strain and differential strain (medium-term anomalies) occurred 2-3 years before the earthquake with a duration of about one year and the abnormalities were very significant. This paper analyzes in detail the changes of the precursory anomalies of Wudu station strain at all stages and makes a preliminary analysis of its causes.