Hybrid Kinematic-Dynamic Approach to Seismic Wave-Equation Modeling, Imaging, and Tomography
Estimation of the structure response to seismic motion is an important part of structural analysis related to mitigation of seismic risk caused by earthquakes. Many methods of computing structure response require knowledge of mechanical properties of the ground which could be derived from near-surfa...
Main Authors: | , |
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Format: | Article |
Language: | English |
Published: |
Hindawi Limited
2015-01-01
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Series: | Mathematical Problems in Engineering |
Online Access: | http://dx.doi.org/10.1155/2015/543540 |
Summary: | Estimation of the structure response to seismic motion is an
important part of structural analysis related to mitigation of
seismic risk caused by earthquakes. Many methods of computing
structure response require knowledge of mechanical properties of
the ground which could be derived from near-surface seismic
studies. In this paper we address computationally efficient
implementation of the wave-equation tomography. This method allows
inverting first-arrival seismic waveforms for updating seismic
velocity model which can be further used for estimating mechanical
properties. We present computationally efficient hybrid
kinematic-dynamic method for finite-difference (FD) modeling of
the first-arrival seismic waveforms. At every time step the FD
computations are performed only in a moving narrowband following
the first-arrival wavefront. In terms of computations we get two
advantages from this approach: computation speedup and memory
savings when storing computed first-arrival waveforms (it is not
necessary to make calculations or store the complete numerical
grid). Proposed approach appears to be specifically useful for
constructing the so-called sensitivity kernels widely used for
tomographic velocity update from seismic data. We then apply the
proposed approach for efficient implementation of the
wave-equation tomography of the first-arrival seismic waveforms. |
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ISSN: | 1024-123X 1563-5147 |