hotspotter

       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] [  -C
       ] [ -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 calcu­
       lates 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 Vol­
       cano Amplitude grid (CVA).  See option -: on how  to  read
       (latitude,longitude,...) files.
               No  space  between the option flag and the associ­
       ated arguments. Use upper case for the  option  flags  and
       lower case for modifiers.

       infile(s)
              Data  file(s)  to be processed. If not given, stan­
              dard 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

       -C     Expect Total Reconstruction  Poles  (Finite  Poles)
              rather  than  Backward  Stage  Poles [Default] File
              format is similar to the stage pole  format  except
              the youngest rotation must be listed first and that
              the tstart column is optional (assumed to be 0 Ma).

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

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


       -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  (lati­
              tude,longitude)  input/output.  [Default is (longi­
              tude,latitude)].  Applies to geographic coordinates
              only.

       -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(l),  grdimage(l),  project(l),  mapproject(l),   back­
       tracker(l) originator(l)

REFERENCES

       Wessel, P., 1999, "Hotspotting" tools released, EOS Trans.
       AGU, 80 (29), p. 319.