Shallow shear-wave seismic reflection imaging, using a sledgehammer and mass energy source and standard processing, has become increasingly common in mapping near-surface geologic features, especially in water-saturat...Shallow shear-wave seismic reflection imaging, using a sledgehammer and mass energy source and standard processing, has become increasingly common in mapping near-surface geologic features, especially in water-saturated, unconsolidated sediments. Tests of the method in the Mississippi Embayment region of the central United States show interpretable reflection arrivals in the depth range of 〈10 m to 〉100 m with the potential for increased resolution when compared with compressional-wave data. Shear-wave reflection prof＇des were used to help interpret the significance of neotectonic surface deformation at five sites in the Mississippi Embayment. The interpreted profiles show a range of shallow structural styles that include reverse faulting, fault propagation folding, and reactivated normal faulting, and provide crucial subsurface evidence in support of paleoseismologic trenching and shallow drilling.展开更多
The theoretic study on the seismic motion in three-dimensional anisotropic media isthe front arca and a diffcult problem of present seismology. The research of the seismicbehavior on the inner interface has important ...The theoretic study on the seismic motion in three-dimensional anisotropic media isthe front arca and a diffcult problem of present seismology. The research of the seismicbehavior on the inner interface has important meaning for the understanding of the seismicpropagation and the interpretation of the sophisticated 3-component seismic records. So far,a few publications about it have been published. In this note, starting from the waveequations and using continuous conditions at the interface, we have derived the reflectingand transmission coefficients on the inner interface in three-domain anisotropic media.展开更多
基金supported by the U.S. Geological Survey, Department of the Interior
文摘Shallow shear-wave seismic reflection imaging, using a sledgehammer and mass energy source and standard processing, has become increasingly common in mapping near-surface geologic features, especially in water-saturated, unconsolidated sediments. Tests of the method in the Mississippi Embayment region of the central United States show interpretable reflection arrivals in the depth range of 〈10 m to 〉100 m with the potential for increased resolution when compared with compressional-wave data. Shear-wave reflection prof＇des were used to help interpret the significance of neotectonic surface deformation at five sites in the Mississippi Embayment. The interpreted profiles show a range of shallow structural styles that include reverse faulting, fault propagation folding, and reactivated normal faulting, and provide crucial subsurface evidence in support of paleoseismologic trenching and shallow drilling.
文摘The theoretic study on the seismic motion in three-dimensional anisotropic media isthe front arca and a diffcult problem of present seismology. The research of the seismicbehavior on the inner interface has important meaning for the understanding of the seismicpropagation and the interpretation of the sophisticated 3-component seismic records. So far,a few publications about it have been published. In this note, starting from the waveequations and using continuous conditions at the interface, we have derived the reflectingand transmission coefficients on the inner interface in three-domain anisotropic media.
