New Zealand Journal of Geology and Geophysics abstracts
Seismic scattering and reverberation, Kaingaroa plateau,
Taupo Volcanic Zone, New Zealand
STEPHEN BANNISTER
ANNE MELHUISH
Institute of Geological & Nuclear Sciences
P.O. Box 1320
Wellington, New Zealand
Abstract Seismic data recorded by a two-dimensional geophone
array on the Kaingaroa plateau of Taupo Volcanic Zone, New Zealand, are
analysed to examine the nature of seismic coda in the region. Analysis of the
array data using semblance techniques can identify arrivals with distinct
propagation direction and apparent velocity and, in particular, scattered waves
associated with heterogeneity in the near-surface layers. The analysis shows
source-related reverberation, which is believed to be associated with the
presence of low-velocity layers of breccia and tuffs beneath the experimental
site. Synthetic seismograms calculated using a porous-elastic formulation of
the wave-equation show that such scattered energy may play a large part in the
degradation of seismic reflection data collected in the region.
Keywords seismic array; reverberation; scattering; Taupo
Volcanic Zone
New Zealand Journal of Geology and Geophysics, 1997, Vol. 40: 375-381
0028-8306/97/4003-0375 $7.00/0 (c) The Royal Society of New Zealand
1997
PDF file of entire paper: medium quality (2521K); (scanned from paper original: notes about this process)
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