radSH: Radiation pattern for SH waves

In RFOC: Graphics for Spherical Distributions and Earthquake Focal Mechanisms

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

Details

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

Value

Amplitude of the SH wave

Author(s)

Jonathan M. Lees <[e-mail]>

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)

RFOC documentation built on Sept. 8, 2023, 6:12 p.m.