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 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 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 con-
tains # 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 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)]. 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(GMTMANSECTION), grdimage(GMTMANSECTION), project(GMTMANSECTION),
mapproject(GMTMANSECTION), backtracker(GMTMANSECTION) originator(GMT-
MANSECTION)
REFERENCES
Wessel, P., 1999, "Hotspotting" tools released, EOS Trans. AGU, 80
(29), p. 319.
VERSION DATE HOTSPOTTER(GMTMANSECTION)
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