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] [ -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) rota-
tions. 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 Ampli-
tude 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
-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 .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(l), grdimage(l), project(l), mapproject(l),
backtracker(l) originator(l)
REFERENCES
Wessel, P., 1999, "Hotspotting" tools released, EOS Trans.
AGU, 80 (29), p. 319.