Imaging complex structures with first-arrival traveltimes |

In their 1993 Geophysics article, Geoltrain and Brac ask the
question *``Can we image complex structures with first-arrival
traveltime?''* They conclude that they cannot, and that they should
either ray trace to find the most energetic arrivals, or calculate
multiple-arrival Green's functions. Nichols (1994) calculates
band-limited Green's functions to estimate the most energetic
arrivals. He estimates not only traveltime, but also amplitude and
phase. My approach is simpler; by breaking up the complex
velocity structure, I am able
to calculate traveltimes in velocity models where
finite-differencing the eikonal equation is valid.
This results in images comparable to those obtained by
Nichols' method and by shot-profile migration at a reduced
computational cost.

Like most of the other researchers in the field, I test my method on the ever-popular Marmousi synthetic.

Imaging complex structures with first-arrival traveltimes |

2013-03-03