1887

Abstract

An important ingredient of any tomography-based velocity inversion method is the determination of traveltime differences. When a ray-based method is used, the modelled traveltimes are directly available and the traveltimes in the observed data need only to be picked once. When using wave-equation-based methods, however, the traveltime difference between two complex waveforms needs to be determined at each iteration. A straight-forward approach automatically picks the onset of relevant arrivals, either directly or via a correlation of the two waveforms. If the waveforms are not very similar, however, this approach is problematic. We propose to measure the traveltime difference via a weighted norm of the correlation of the two waveforms. The weighted norm can be used directly as an optimisation criterion for waveform tomography. We illustrate this with a synthetic and real data example.

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/content/papers/10.3997/2214-4609.201400600
2010-06-14
2020-05-31
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201400600
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