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通过对温州珊溪水库地震序列开展了近一年的近场源剪切波分裂参数研究,在进行精确定位并确保所用资料满足剪切波窗要求的基础上,采用互相关系数法,借助遗传算法与人工判读相结合,测量了地震序列的快剪切波偏振方向和快慢剪切波的时间延迟.结果表明,地震序列的S波分裂现象明显,台站记录到的地震快剪切波平均偏振方向与区域最大水平主压应力方向基本一致;温州珊溪水库地区快剪切波平均偏振方向在近N-S向;S波分裂快剪切波偏振方向所表现出的离散和空间差异性,认为可能是由于局部构造影响;目前库区应力场稳定,应力调整已经结束,未来发生强余震的可能性较小.
Near-field source shear-wave splitting parameters have been studied for the Shanxi Shanxi reservoir seismic sequence in recent years. On the basis of accurate positioning and ensuring that the data used meet the requirements of the shear-wave window, the cross correlation coefficient method is adopted, The results show that the S-wave splitting phenomenon of the earthquake sequence is obvious, and the mean values of fast shear wave recorded by the station The direction of polarization is basically consistent with the direction of the maximum horizontal compressive stress in the region. The average polarization direction of fast shear-wave in the Shanxi reservoir is close to NS, and the discrepancy and spatial discrepancy of the polarization direction of the S-wave splitting fast shear- It may be due to the local tectonics. At present, the stress field in the reservoir area is stable and the stress adjustment is over. It is less likely that a strong aftershock will occur in the future.