【摘要】 利用国际禁核组织在海拉尔布设的小孔径地震台阵的16个深远地震波资料,分离出了P波波场中不相干的尾波.频率域中对波场扰动的研究表明,在0.5～3.0 Hz的频率范围内,观测到的波场扰动可以利用P波在随机介质中的散射进行解释.不同远震事件得到的稳定结果表明,在该台阵下方34 km厚的地壳和110 km厚的岩石层中可能存在相关长度为2.0～7.4 km的散射体.更多还原

【Abstract】 Incoherent seismic wavefield fluctuations recorded by Hailaer CTBTO seismic array are separated from 16 deep teleseismic events.The frequency-dependent intensities of the mean and fluctuation wavefields are analyzed.The observed wavefield fluctuations in the frequency range 0.5～3.0 Hz can be explained by scattering of the teleseismic P-wave front at random media-type structures.The stable and narrow range of the fluctuation parameters from these teleseismic events indicates evidence for scattered seismic phases which are generated inside the crust and lithosphere.The reasonable structural models contain heterogeneities with 2.0～7.4 km correlation lengths in the 34 km thick crust and the 110 km thick lithosphere.更多还原