readCMT: Read Harvard CMT moment

In RFOC: Graphics for Spherical Distributions and Earthquake Focal Mechanisms

Read Harvard CMT moment

Description

Read and plot a CMT solution copied from the Harvard CMT website.

Usage

readCMT(filename, PLOT=TRUE)

Arguments

filename	character, file name
PLOT	Logical, TRUE=plot mechanisms sequentially

Details

Uses the standard output format.

Value

List of mechanisms and graphical Side effects. Each element in the list consists of a list including: FIRST,yr,mo,dom,hr,mi,sec,name,tshift,half,lat,lon,z,Mrr,Mtt,Mpp,Mrt,Mrp,Mtp. The FIRST element is simply a duplicate of the PDE solution card.

Note

Other formats are available.

Author(s)

Jonathan M. Lees<[e-mail]>

References

Ekstrom, G.; Nettles, M. and DziewoDski, A. The Global CMT Project 2004-2010: centroid-moment tensors for 13,017 earthquakes Physics of the Earth and Planetary Interiors, 2012.

See Also

doNonDouble, MapNonDouble

Examples

## Not run: 
Hcmt = readCMT("CMT_FULL_FORMAT.txt")

########  or,

Hcmt = readCMT("CMT_FULL_FORMAT.txt", PLOT=FALSE)

 moments = matrix(ncol=7, nrow=length(Hcmt))
Locs = list(y=vector(length=length(Hcmt)) ,x=vector(length=length(Hcmt)))


for(i in 1:length(Hcmt))
{
P1 = Hcmt[[i]]
#########  Note the change of sign for cartesian coordinates
 moments[i,] = cbind(i, P1$Mtt, P1$Mpp, P1$Mrr,
        -P1$Mrp, P1$Mrt ,-P1$Mtp)
Locs$y[i] = P1$lat
Locs$x[i] = P1$lon

}


mlon = mean(Locs$x, na.rm=TRUE)
mlat = mean(Locs$y, na.rm=TRUE)


PROJ =  GEOmap::setPROJ(type = 1, LAT0 = mlat , LON0 = mlon)
Glocs = GEOmap::GLOB.XY(Locs$y, Locs$x, PROJ       )


LIMlat = expandbound(Locs$y)
LIMlon = expandbound(Locs$x)

PLAT =  pretty(LIMlat)
 PLON  = pretty(LIMlon)

data(worldmap)
par(xpd=FALSE)

plotGEOmapXY(worldmap, LIM = c(LIMlon[1],LIMlat[1] ,LIMlon[2],LIMlat[2]) ,
             PROJ=PROJ, axes=FALSE, xlab="", ylab="" )

### add tic marks
kbox = GEOmap::GLOB.XY(PLAT,PLON, PROJ)

      sqrTICXY(kbox , PROJ, side=c(1,2,3,4), LLgrid=TRUE, col=grey(.7) )

########  add focal mechs

MapNonDouble(Glocs, moments, col=NULL, add=TRUE)




## End(Not run)

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