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2014云南盈江区域5月下旬接连发生了M_S5.6和M_S6.1级两个地震(双震),双差定位结果显示这次的盈江双震及其余震序列呈明显的时空聚集分布特征.本文基于波形互相关计算方法,挑选了盈江双震期间研究区内的重复地震事件,利用尾波干涉技术,分析地震序列持续期间地壳介质的物性变化.结果显示,在距离震源区较近的台站发现了盈江地震期间走时延迟的变化特征,随着流逝时间的不同,走时延迟变化复杂不一,这种变化可能源于不同路径上散射体的不同变化.其中,S波早期的尾波部分呈现明显的线性变化,可能是震源区附近地壳介质的波速变化所引起.研究发现,在两个主震之间和第二个主震之后走时延迟变化的特点不同,可能表示因不同地壳应力变化导致的介质性质变化.
In 2014, two earthquakes (double earthquakes), M_S5.6 and M_S6.1, occurred successively in the late May in Yingjiang area of Yunnan Province. The double-difference positioning results show that the Yingjiang double aftershock and its aftershocks have obvious spatial and temporal distributions. Based on the waveform cross-correlation calculation method, the repeated seismic events in the study area during the Yingjiang double-strike were selected and the variation of the physical properties of the crustal medium during the earthquake sequence was analyzed by using the coda wave interference technique. The results show that at stations close to the source region, The variation characteristics of travel time delay during the Yingjiang earthquake show that the variation of travel time delay varies with the lapse of time, which may be due to the different changes of the scatterers on different paths. Among them, the early coda part of the S wave presents The obvious linear change may be caused by the change of the velocity of the crustal medium in the vicinity of the source region.The study found that the characteristics of the delay variation between the two main shocks and the second main shock are different and may indicate that due to the different crustal stress changes The nature of the media changes.