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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

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 <jonathan.lees@unc.edu>

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

Graphics for Spherical Distributions and Earthquake Focal Mechanisms

v3.4-6
GPL (>= 2)
Authors
Jonathan M. Lees [aut, cre], Keehoon Kim [ctb]
Initial release
2018-01-17

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