RFOC-package: Calculates and plot Earthquake Focal Mechanisms

Description

Graphics for statistics on a sphere, as applied to geological fault data, crystallography, earthquake focal mechanisms, radiation patterns, ternary plots and geographical/geological maps. Given strike-dip-rake or a set of focal planes, RFOC creates structures for manipulating and plotting earthquake focal mechanisms as individual plots or distributed spatially maps.

Arguments

Details

ll{ Package: RFOC Type: Package Version: 1.0-4 Date: 2008-08-17 License: GPL } Visualize focal mechanisms in a number of modes, including: beachball plots, radiation plots, fault planes and ternary diagrams. Shows spatial distribution of spherically distributed data.

References

J. M. Lees. Geotouch: Software for three and four dimensional GIS in the earth sciences. {Computers & Geosciences , 26(7):751--761, 2000.

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

Snyder, John P., 1987, Map Projections-a working manual, USGS-Professional Paper, 383p.

C. Frohlich. Triangle diagrams: ternary graphs to display similarity and diversity of earthquake focal mechanisms. {Physics of the Earth and Planetary Interiors, 75:193-198, 1992.

} package Rsac Rsac ############# plot one focal mechanism: M = SDRfoc(-25, 34, 16,u = FALSE, ALIM = c(-1, -1, +1, +1), PLOT=TRUE)

############# plot many P-axes: paz = rnorm(100, mean=297, sd=100) pdip = rnorm(100, mean=52, sd=20) net() focpoint(paz, pdip, col='red', pch=3, lab="", UP=FALSE)

#############

#### Show many Focal mechanisms on a plot:

Z1 = c(159.33,51.6,206,18,78, 161.89,54.5,257,27,133, 170.03,53.57,-44,13,171, 154.99,50.16,-83,19,-40, 151.09,47.15,123,23,-170, 176.31,51.41,-81,22,122, 153.71,46.63,205,28,59, 178.39,51.21,-77,16,126, 178.27,51.1,-86,15,115, 177.95,51.14,-83,25,126, 178.25,51.18,215,16,27 )

MZ = matrix(Z1, ncol=5, byrow=TRUE)

plot(MZ[,1], MZ[,2], type='n', xlab="LON", ylab="LAT", asp=1)

for(i in 1:length(MZ[,1])) { paste(MZ[i,3], MZ[i,4], MZ[i,5])

MEC = SDRfoc(MZ[i,3], MZ[i,4], MZ[i,5], u=FALSE, ALIM=c(-1,-1, +1, +1), PLOT=FALSE) fcol = foc.color(foc.icolor(MEC$rake1), pal=1) justfocXY(MEC, x=MZ[i,1], y =MZ[i,2] , size = c(1, 1), fcol =fcol , fcolback = "white", xpd = TRUE)

}