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通过研究近场强震动记录,发现汶川Ms8.0地震近场峰值加速度在空间上存在较明显的上盘效应和方向性效应,与汶川引起的地质灾害空间分布具有较好的一致性.但在所有强震仪所记录的汶川Ms8.0地震同震加速度记录积分所得地壳同震速度中,有的台站数据存在典型的线性偏移,有的台站数据除线性偏移外还存在明显的非线性偏移.采用非线性基线改正方法处理汶川Ms8.0强震同震记录,改正后所得同震位移明显要比线性基线改正更合乎实际情况.以强震动、GPS和InSAR同震位移处理结果做约束,反演了汶川Ms8.0地震同震位错分布,对于汶川Ms8.0地震主要同震破裂断裂(北川-映秀断裂),强震动反演结果不仅较好地刻画了汶川Ms8.0地震同震主断裂上地表破裂空间分布详细变化特征,同时也较好地反映北端破裂衰减情况,该结果表明:强震动资料可以为强震后的救援和灾害评估等工作提供具有参考价值的研究结果;另一方面,受数据数量的制约,用强震动改正后位移反演所得位错分布中仅汉旺断裂南段存在较为明显位错,强震仪布设时应更多地考虑是否相对均匀地分布在具有发震潜势的断裂周缘,以期更好地在震后应急救灾中发挥更好的作用.
Through the study of near-field strong motion records, it is found that the near-field peak acceleration of Wenchuan Ms8.0 earthquake has obvious hanging-plate effect and directional effect in space, which is in good agreement with the spatial distribution of geological disasters caused by Wenchuan. However, In all the crustal coseismic velocities recorded by the Wenchuan Ms8.0 earthquake epicenter acceleration records recorded by all the strong seismometers, some station data have typical linear deviations, and some station data have obvious Nonlinear Offset Correction of the Wenchuan Ms8.0 strong earthquake using the non-linear baseline correction method is more realistic than that of the linear baseline correction.With strong motion, GPS and InSAR co-seismic displacements The results are constrained to invert the coseismic dislocation distribution of Wenchuan Ms8.0 earthquake. For the main synseismic rupture fault of Wenchuan Ms8.0 earthquake (Beichuan-Yingxiu fault), the strong seismic inversion results not only describe Wenchuan Ms8 well. 0 detailed analysis of the spatial distribution of the surface rupture on the main fault of the quake-coseismic earthquake and also the attenuation of the north end at the same time. The results show that the strong seismic data can be used for rescue and disaster assessment after strong earthquakes On the other hand, due to the number of data, there is obvious dislocation in the southern section of Hanwang fault in the dislocation distribution derived from the post-correction of strong earthquakes. More consideration is given to whether the fractures are relatively evenly distributed around the fault with the potential of the earthquake so as to better play a better role in post-earthquake emergency relief.