EAS 434 Reflection Seismology
HW 5 Synthetic seismograms
Due 11/13/04
A valuable tool for interpretation is the synthetic seismogram, in which we “guess” what
the geology might be, then compute the “expected” seismic response for comparison with
the data at hand.
Computation of 1D synthetics is rather easy, since
st = et * wt
where
st =
et =
wt =
1D seismogram
reflection coefficient series represent 1D geology
source wavelet.
Given the following source wavelet:
wt = 0,1,2,3,2,1,0,-1,-2,-3,-2,-1,0 for t = .01 sec
Compute the synthetic seismic trace st for the following geologic models:
Model 1)
_________________________________ z = 0 m
V = 2 km/sec, r = 1.8 g/cc
_________________________________ z = 100 m
V = 4 km/sec, r = 2.0 g/cc
_________________________________ z = 500 m
Model 2)
_________________________________ z = 0 m
V = 2 km/sec, r = 1.8 g/cc
_________________________________ z = 100 m
V = 4 km/sec, r = 2.0 g/cc
_________________________________ z = 200 m
Compute a spiking deconvolution filter for the wavelet wt, then recompute the synthetics
by passing them through this deconvolution filter. Note: use the same number of terms in
your deconvolution filter as you have in your original wavelet wt.
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