RFOC (version 2.0-00)

radSH: Radiation pattern for SH waves

Description

calculate the radiation patterns for SH waves

Usage

radSH(del, phiS, lam, ichi, phi)

Arguments

del

degrees, angle

phiS

degrees,angle

lam

degrees, angle

ichi

degrees, take off angle

phi

degrees, take off azimuth

Value

• Amplitude of the SH wave

Details

Given a focal mechanism strike-dip-rake and a given incident angle (take-off angle) and azimuth, return the SH amplitude

References

K.~Aki and P.~G. Richards.Quantitative seismology. University Science Books, Sausalito, Calif., 2nd edition, 2002.

See Also

radP, radSV, imageSH

Examples

phiS=65
del=25
lam=13
x = seq(-1, 1, 0.01)
y = x

X = matrix(rep(x, length(y)), nrow= length(x))
Y = t(X)
RAD2DEG = 180/pi
p = RAD2DEG*(pi/2 -atan2(Y, X))
p[p<0] = p[p<0] + 360

R = sqrt(X^2+Y^2)
R[R>1] = NaN
dip =RAD2DEG*2*asin(R/sqrt(2))

###  Calculate the radiation pattern
G = radSH(del, phiS, lam, dip, p)

###  plot values
image(x,y,G, asp=1)