hotspotter - Create CVA image from seamount flowlines
hotspotter [infile(s)] -Estage_file -GCVAgrid -Ix_inc[m|c][/y_inc[m|c]]
-Rwest/east/south/north[r] [ -C ] [ -Dfactor ] [ -F ] [ -H[nrec] ] [
-Nupper_age ] [ -T ] [ -V ] [ -: ] [ -bi[s][n] ]
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,...)
No space between the option flag and the associated arguments.
Use upper case for the option flags and lower case for modifiers.
Data file(s) to be processed. If not given, standard input is
-E Give file with stage poles and opening angles. This file must
contain one record for each stage; each record must be of the
lon lat tstart tstop ccw-angle
where tstart and tstop are in Ma and the rest is in degrees. The
oldest stage must be listed first. tstart (tstop) is the age of
the old (young) end of the stage. Blank lines and records whose
first column contains # will be ignored.
-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
-D Modify the sampling interval along flowlines. Default [0.5]
gives approximately 2 points within each grid box. Smaller fac-
tors gives higher resolutions at the expense of longer process-
-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 .gmtdefaults4 file. If used, GMT
default is 1 header record. Use -Hi if only input data should
have header records [Default will write out header records if
the input data have them].
-N Set the upper age to assign seamounts whose crustal age is
-bi Selects binary input. Append s for single precision [Default is
double]. Append n for the number of columns in the binary
[Default is 5 input columns].
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
This file can then be plotted with grdimage.
gmt(GMTMANSECTION), grdimage(GMTMANSECTION), project(GMTMANSECTION),
mapproject(GMTMANSECTION), backtracker(GMTMANSECTION), originator(GMT-
Wessel, P., 1999, "Hotspotting" tools released, EOS Trans. AGU, 80
(29), p. 319.
GMT4.0 1 Oct 2004 HOTSPOTTER(GMTMANSECTION)
Man(1) output converted with