The resulting velocity image shows good agreement with other geologic and geophysical data. The frequency range of the seismograms is 1 to 6.6 kHz, allowing resolution of velocity structure on a scale of several meters. The method is demonstrated on a small synthetic data set, where convergence to the correct solution is achieved in a few iterations.The method is then applied to field data from a crosshole experiment in crystalline rock. The iterations continue until the synthetic traveltimes fit the data to within the data error or until no improvement in the fit of the traveltimes is observed.
#SEISIMAGER UPDATE#
A damped least-squares method solves for the velocity perturbations which update the model.
Within each iteration, the differences between the data and the current model traveltimes obtained by ray tracing are related to the unknown velocity perturbations through a system of linear equations. Un anillo de sinnimos es un conjunto de palabras o frases que se consideran equivalentes para representar un concepto o tema. The procedure of MASW data processing using SeisImager software, a) detection of surface waves, b) image of dispersion curve, c) inversion of dispersion curve, d) 1D shear wave velocity profile. We present here an iterative inversion scheme based on two-dimensional ray tracing and its successful application to field data.The interpretation method iteratively ray traces and then updates the velocity model. Other work has taken this nonlinear effect into account, but there do not appear to be many cases of demonstrated success in its application to the crosshole seismic problem. This approximation is valid where the velocity does not vary greatly, but in many regions of interest velocity variations of 10-20 percent or more are observed, causing significant ray curvature. With SeisImager/SW, data processing is simple, putting the answers you seek at your fingertips. Surface waves are easy to record and loaded with information about the subsurface.
#SEISIMAGER SOFTWARE#
Many tomographic interpretations of crosshole seismic traveltimes have approximated the raypaths with straight lines connecting the source and receiver. Many tomographic interpretations of crosshole seismic traveltimes have approximated the raypaths with straight lines connecting the source and receiver. SeisImager/SW - Seismic Software by Geomatrix Earth Science Ltd.
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