论文部分内容阅读
为探讨玉树地震是否为超剪切破裂事件,利用Yagi的方法重新进行了此次地震震源破裂过程的反演。通过给定不同的破裂速度进行对比,发现当破裂速度为4.7km/s时,理论与实际观测结果拟合残差最小,且反演结果更符合实际。另据P波高频辐射能量包络反演,破裂传播速度在4.7~5.8km/s范围内,而该地区的剪切波速度则为3.0~3.6km/s,从而证明了此次地震超剪切破裂现象的存在。反演结果表明,此次地震在玉树段的NW和SE段形成了19和31km的地表破裂,而震中所在的中段由于隆宝湖拉分盆地的存在,造成了15km的未破裂区。超剪切破裂是造成SE段玉树县城遭受严重破坏的原因之一。
To investigate whether the Yushu earthquake is a super shear failure event, the Yagi method was used to reconstruct the seismic source rupture process. By comparing the different rupture velocities, it is found that when the rupture velocity is 4.7 km / s, the residuals of the theoretical and practical observations are the least, and the inversion results are more realistic. In addition, according to the P-wave high-frequency radiative energy envelope inversion, the rupture propagation velocity is in the range of 4.7-5.8km / s, while the shear wave velocity in this area is 3.0-3.6km / s, which proves that the seismic super The existence of shear fracture phenomenon. The inversion results show that the earthquake caused 19 and 31 km surface ruptures in the NW and SE sections of the Yushu section, while the middle section of the epicenter caused a 15 km unbroken zone due to the existence of the Longbao Lake pull-apart basin. One of the causes of the serious damage to the SE section of Yushu County is the super shear failure.