陕西及周邻地区几个地震丛序列的震源谱振幅相关研究

STUDY ON THE CORRELATION OF SPECTRAL AMPLITUDE OF SEVERAL SEISMIC CLUSTERS IN SHAANXI AND ADJACENT AREAS

选取自2008年汶川地震以来山西霍州、陕西宁强、宁夏银川及甘肃古浪地区附近发生4个中小地震丛集,采用谱振幅相关分析法计算了各个地震丛序列的谱振幅相关系数随时间的变化,分析了各序列地区发生强震的危险性。结果表明,山西霍州序列谱振幅相关系数较高,表明霍州地区附近应力水平较高,后续发生强震的危险性较大。其余3个地区附近地震丛序列谱振幅相关系数较低,表明这3个地区应力水平不高,后续发生强震的危险性较小。

Basing on four small seismic clusters occurred near Ningqang, Huozhou, as since the 2008 Wenchuan Ms8.0 earthquake, the correlation coefficient changes Yinchuan and Gulang are- with time of spectral ampli- tude of each earthquake cluster sequence is calculated by the new method of correlation analysis of spectral amplitude, and the risk of strong earthquake in each sequence region is analyzed. The results show that the cor- relation coefficient of spectral amplitude of the Huozhou seismic sequence is higher than others, thus the stress level, the consistency focal mechanism of small earthquakes, and the risk of subsequent strong earthquakes near the Huozhou area is higher. The spectral amplitude correlation coefficient of other three regions is lower, indica- ting that the stress level of these three areas is not high, the consistency focal mechanism of small earthquakes is not high, and the risk of subsequent strong earthquakes is lower.