Article,
Wide-band velocity filtering---the pie-slice process
Geophysics, 28 (6): 948--974 (Dec 1, 1963)
DOI: 10.1190/1.1439310
Abstract
A new technique has been developed which makes it possible to process
a seismic record-section in such a way that all seismic events with
dips in a given range are preserved with no alteration over a wide
frequency band, while all seismic events with dips outside the specified
range are uniformly and severely attenuated. By applying this process
to a noisy record-section, a record-section may be obtained which
has all events within a specified dip range perfectly preserved,
and very high-velocity noise essentially eliminated, a result which
is impossible by simple wave-number filtering or conventional array
usage. In structurally complex areas where several steeply dipping
events interfere, the technique may be applied to separate the events
with different dips. In areas where a normal-moveout contrast exists
between primaries and multiples, the technique may be used for wide-band
multiple attenuation. By application of a 'rotating Pie-Slice' to
micro-spread noise data, seismic noise may be separated on the basis
of propagation velocity, and a clearer picture of the seismic noise
problem obtained. The 'rotating Pie-Slice' also provides a means
of uncovering diffractions and other steeply-curved events from a
record section. The paper discusses the motivation and implementation
of the process and its application to both synthetic and actual data.
