Rquake (version 2.5-1)

eqlipse: Error Elipse for Hypocenter Location

Description

Error Elipse for Hypocenter Location

Usage

eqlipse(x, y, cov, wcols = c(1, 2), dof = 2, pct=0.05, ...)

Value

Side effects, graphical

Arguments

x

X-location for drawing

y

Y-location for drawing

cov

matrix, 3 by 3 Covariance matrix

wcols

vector, which columns to extract from cov, see details.

dof

Degrees of Freedom for 95 percent confidence

pct

Percent used for 2-sided confidence bounds, default=0.05

...

graphical parameters, par

Author

Jonathan M. Lees<[e-mail]>

Details

The 3 by 3 matrix is supplied and a 2 by 2 matrix is subtracted depending on which components are being drawn. For X-Y projections, use wcols=c(1,2). For vertical cross sections, rotate the cov matrix and then extract the columns.

See Also

eqwrapup

Examples

library(RSEIS)
data(GH, package='RSEIS')
data(VELMOD1D, package='RSEIS' )


vel = VELMOD1D


gpf = GH$pickfile

w1 = which(gpf$STAS$phase=="P" | gpf$STAS$phase=="S" )

N = length(w1)

 Ldat =    list(
      name = gpf$STAS$name[w1],
      sec = gpf$STAS$sec[w1],
      phase = gpf$STAS$phase[w1],
      lat=gpf$STAS$lat[w1],
      lon = gpf$STAS$lon[w1],
      z = gpf$STAS$z[w1],
      err= gpf$STAS$err[w1],
      yr = rep(gpf$LOC$yr , times=N),
      jd = rep(gpf$LOC$jd, times=N),
      mo = rep(gpf$LOC$mo, times=N),
      dom = rep(gpf$LOC$dom, times=N),
      hr =rep( gpf$LOC$hr, times=N),
      mi = rep(gpf$LOC$mi, times=N) )

EQ = GH$pickfile$LOC

EQ$t = EQ$sec

kuality = eqwrapup(Ldat, EQ, vel, distwt = 20, verbose = TRUE )


 MLAT = median(Ldat$lat)
  MLON = median(Ldat$lon)
  proj = GEOmap::setPROJ(type=2, LAT0=MLAT, LON0=MLON)

  XYSTAS = GEOmap::GLOB.XY(Ldat$lat,  Ldat$lon , proj)


 eqxy = GEOmap::GLOB.XY(EQ$lat, EQ$lon, proj)


plot(range(c(XYSTAS$x, eqxy$x)), range(c(XYSTAS$y, eqxy$y)),
          type='n', asp=1, xlab="km", ylab="km" )
points(XYSTAS$x, XYSTAS$y, pch=6)
points(eqxy$x, eqxy$y, pch=8, col='red')

####  covariance matrix
KOV = kuality$cov[2:4, 2:4]

####  add uncertainty
eqlipse(eqxy$x, eqxy$y , KOV,   wcols = c(1,2) , dof=kuality$ndf,
border="blue"  )