RSEIS (version 3.7-4)

sigconvGR: convolve for Ground roll

Description

convolve a set of spikes for extended ground roll. This is a special case of sigconv.

Usage

sigconvGR(wigmat, wavepulse, dt)

Arguments

wigmat

matrix of traces with spikes

wavepulse

wavelet

dt

sampling interval

Value

Matrix, waveforms

Details

This is similar to the sigconv program but it assumes that the ground roll is extrened in time and space as the wave expands.

See Also

wiggleimage, symshot1, genrick, sigconv

Examples

# NOT RUN {
S1 <- symshot1()
dt <- S1$dt
###########    these are the reflections S1$GRrec

d <- dim(S1$smograms)
G1 <- matrix( rep(0, length=d[1]*d[2]), ncol=d[2], nrow=d[1])

###   these are the refractions S1$THEORY$trefrac
p <- round( S1$THEORY$trefrac[1,]/S1$dt );
G1[cbind(p , 1:d[2])  ] <- 1


#### plot the spikes
wiggleimage(0.1*G1, dt = -S1$dt, dx = S1$x, col = "black")

grlen <- floor(.6/dt)
fgr <- 10
tape <- applytaper( rep(1, grlen), p = 0.2)
tgr <- seq(from=0, by=dt, length=grlen)
siggr <- tape*sin(2*pi*fgr*tgr)

##############  convolve the wavelet with the set of spikes
H1 <- sigconvGR(G1, siggr, dt)

############  plot
wiggleimage(0.1*H1, dt = -S1$dt, dx = S1$x, col = "black")

# }