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() gives an example of the FEAVO effect
on a real 2D dataset and interprets its physical
meaning. Claerbout acknowledges the importance of the phenomenon
by including a description and an explanation of it in his course
notes and in his book, Imaging the Earth's
Interior . () use forward
modeling to show that FEAVO effects can be due to smooth velocity
anomalies deviating by as little as 2% from the background
velocity. The anomalies must be large compared to a wavelength but
small when compared to the propagation distance. A solid case study
() based on two real 3D datasets and on realistic forward
modeling shows that not only shallow velocity anomalies can cause
FEAVO effects; the sudden termination of a deep (3000m), low
velocity layer by a fault can also be a source of focusing that
affects the amplitudes more strongly than the traveltimes. This point
draws interest: () received a Best Paper
award at the SEG Annual Meeting and the idea is reiterated in
() and ().
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Stanford Exploration Project
6/7/2002