originator - Associate seamounts with hotspot point sources
originator [infile(s)] -Estage_file -Fhs_file [ -C ] [ -Dd_km ] [
-H[nrec] ] [ -Nupper_age ] [ -S[n_hs] ] [ -T ] [ -V ] -Wmaxdist ] [ -:
] [ -bi[s][n] ]
originator reads (longitude, latitude, height, radius, crustal_age)
records from infiles [or standard input] and uses the given Absolute
Plate Motion (APM) stage poles and the list of hotspot locations to
determine the most likely origin (hotspot) for each seamount. It does
so by calculating flowlines back in time and determining the closest
approach to all hotspots. The output consists of the input records with
four additional fields added for each of the n_hs closest hotspots. The
four fields are the hotspot id (e.g., HWI), the stage id of the flow-
line segment that came closest, the pseudo-age of the seamount, and the
closest distance to the hotspot (in km). See option -: on how to read
(latitude, longitude,height, radius, crustal_ag) files.
No space between the option flag and the associated arguments.
Use upper case for the option flags and lower case for modifiers.
Seamount data file(s) to be analyzed. 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
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.
-F Give file with hotspot locations. This file must contain one
record for each hotspot to be considered; each record must be of
the following format:
lon lat hs_id hs_name
E.g., for Hawaii this may look like
205 20 HWI Hawaii
Blank lines and records whose first column contains # will be
-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
-N Set the maximum age to extend the oldest stage back in time [no
-S Set the number of closest hotspots to report [Default is 1].
-T Truncate seamount ages exceeding the upper age set with -N [no
-V Selects verbose mode, which will send progress reports to stderr
[Default runs "silently"].
-W Only report those seamounts whose flowlines came within maxdist
to any hotspot [Default reports all seamounts].
-: Toggles between (longitude,latitude) and (latitude,longitude)
input and/or output. [Default is (longitude,latitude)]. Append
i to select input only or o to select output only. [Default
-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 find the likely (hotspot) origins of the seamounts represented by
the (x,y,z,r,tc) points in the file seamounts.d, using the DC85.d Euler
poles and the pac_hs.d list of possible hotspots, and report the 2 most
likely hotspot candidates for each seamount, run
originator seamounts.d -S2 -EDC85.d -Fpac_hs.d > origins.d
gmt(GMTMANSECTION), project(GMTMANSECTION), mapproject(GMTMANSECTION),
Wessel, P., 1999, "Hotspotting" tools released, EOS Trans. AGU, 80
(29), p. 319.
GMT4.0 1 Oct 2004 ORIGINATOR(GMTMANSECTION)
Man(1) output converted with