NAME

      hotspotter - Create CVA image from seamount flowlines


SYNOPSIS

      hotspotter [infile(s)] -Estage_file -GCVAgrid -Ix_inc[m|c][/y_inc[m|c]]
      -Rwest/east/south/north[r] [ -F ] [ -H[nrec] ] [ -Nupper_age ] [ -T ] [
      -V ] [ -: ] [ -bi[s][n] ]


DESCRIPTION

      hotspotter reads (longitude, latitude, amplitude, radius, age) records
      from infiles  [or standard input] and calculates flowlines using the
      specified stage pole (Euler) rotations.  These flowlines are convolved
      with the shape of the seamount (using a Gaussian shape given amplitude
      and radius = 6 sigma) and added up to give a Cumulative Volcano
      Amplitude grid (CVA).  See option -: on how to read
      (latitude,longitude,...) files.
           No space between the option flag and the associated arguments.
      Use upper case for the option flags and lower case for modifiers.

      infile(s)
           Data file(s) to be processed.  If not given, standard input is
           read.

      -E   Give file with stage poles and opening angles.  This file must
           contain one record for each stage; each record must be of the
           following format:

                lon lat tstart tstop ccw-angle

           where time is in Ma and the rest is in degrees.  Oldest stage
           must be listed first.  tstart is the time when the stage begins
           (oldest age).  Blank lines and records whose first column
           contains # will be ignored.


OPTIONS

      -F   Force pixel registration [Default is grid registration].

      -H   Input file(s) has Header record(s).  Number of header records can
           be changed by editing your .gmtdefaults file.  If used, GMT
           default is 1 header record.

      -N   Set the upper age to assign seamounts whose crustal age is
           unknown (i.e. NaN) [no upper age].

      -T   Truncate seamount ages exceeding the upper age set with -N [no
           truncation].

      -V   Selects verbose mode, which will send progress reports to stderr
           [Default runs "silently"].


      -:   Toggles between (longitude,latitude) and (latitude,longitude)
           input/output.  [Default is (longitude,latitude)].

      -bi  Selects binary input.  Append s for single precision [Default is
           double].  Append n for the number of columns in the binary
           file(s).  [Default is 5 input columns]


EXAMPLES

      To create a CVA image from the Pacific (x,y,z,r,t) data in the file
      seamounts.d, using the DC85.d Euler poles, run

      hotspotter seamounts.d -EDC85.d -GCVA.grd -R130/260/-66/60 -I10m -N145
      -T -V

      This file can then be plotted with grdimage.


SEE ALSO

      gmt, grdimage, project, mapproject, backtracker


REFERENCES

      Wessel, P., 1999, "Hotspotting" tools released, EOS Trans. AGU, 80
      (??), p. ??.






























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