pscoupe - Plot cross-sections of focal mechanisms
pscoupe [ files ] -Jparameters -Rregion -Aparameters [ -B[p|s]parameters ] [ -Ecolor ] [ -Fmode[args] ] [ -Gcolor ] [ -K ] [ -L[pen] ] [ -M ] [ -N ] [ -O ] [ -Q ] [ -S<symbol><scale>[/d] ] [ -Tn ] [ -U[just/dx/dy/][c|label] ] [ -V[level] ] [ -Wpen ] [ -Xx_offset ] [ -Yy_offset ] [ -Zcpt ] [ -ccopies ] [ -di<nodata> ] [ -h<headers> ] [ -i<flags> ] [ -:[i|o] ]
Note: No space is allowed between the option flag and the associated arguments.
pscoupe reads data values from files [or standard input] and generates PostScript code that will plot symbols, lines or polygons on a cross-section. Focal mechanisms may be specified and require additional columns of data. The PostScript code is written to standard output.
Unless -Q is used, new file is created with the new coordinates (x, y) and the mechanism (from lower focal half-sphere for horizontal plane, to half-sphere behind a vertical plane). When the plane is not horizontal, - north direction becomes upwards steepest descent direction of the plane (u) - east direction becomes strike direction of the plane (s) - down direction (= north^east) becomes u^s Axis angles are defined in the same way as in horizontal plane in the new system. Moment tensor (initially in r, t, f system that is up, south, east) is defined in (-u^s, -u, s) system.
selects the cross-section.
selects the meaning of the columns in the data file and the figure to be plotted.
Focal mechanisms in Aki and Richards convention. scale adjusts the scaling of the radius of the “beach ball”, which will be proportional to the magnitude. The scale is the size for magnitude = 5 in PROJ_LENGTH_UNIT (unless c, i, or p is appended to indicate that the size information is in units of cm, inches, meters, or points, respectively). Use the -T option to render the beach ball transparent by drawing only the nodal planes and the circumference. The color or shade of the compressive quadrants can be specified with the -G option. The color or shade of the extensive quadrants can be specified with the -E option. Parameters are expected to be in the following columns:
- 1,2:
- longitude, latitude of event (-: option interchanges order)
- 3:
- depth of event in kilometers
- 4,5,6:
- strike, dip and rake
- 7:
- magnitude
- 8,9:
- not used; can be 0 0; allows use of the psmeca file format
- 10:
- text string to appear above the beach ball (default) or under (add u).
Focal mechanisms in Harvard CMT convention. scale adjusts the scaling of the radius of the “beach ball”, which will be proportional to the magnitude. The scale is the size for magnitude = 5 (that is M0 = 4E+23 dynes-cm.) in PROJ_LENGTH_UNIT (unless c, i, or p is appended to indicate that the size information is in units of cm, inches, meters, or points, respectively). Use the -T option to render the beach ball transparent by drawing only the nodal planes and the circumference. The color or shade of the compressive quadrants can be specified with the -G option. The color or shade of the extensive quadrants can be specified with the -E option. Parameters are expected to be in the following columns:
- 1,2:
- longitude, latitude of event (-: option interchanges order)
- 3:
- depth of event in kilometers
- 4,5,6:
- strike, dip, and slip of plane 1
- 7,8,9:
- strike, dip, and slip of plane 2
- 10,11:
- mantissa and exponent of moment in dyne-cm (if magnitude is uses instead of scalar moment, magnitude is in column 10 and 0 must be in column 11)
- 12,13:
- not used; can be 0 0; allows use of the psmeca file format
- 14:
- text string to appear above the beach ball (default) or under (add u).
Focal mechanisms given with partial data on both planes. scale adjusts the scaling of the radius of the “beach ball”, which will be proportional to the magnitude. The scale is the size for magnitude = 5 in PROJ_LENGTH_UNIT (unless c, i, or p is appended to indicate that the size information is in units of cm, inches, meters, or points, respectively). The color or shade of the compressive quadrants can be specified with the -G option. The color or shade of the extensive quadrants can be specified with the -E option. Parameters are expected to be in the following columns:
- 1,2:
- longitude, latitude of event (-: option interchanges order)
- 3:
- depth
- 4,5:
- strike, dip of plane 1
- 6:
- strike of plane 2
- 7:
- must be -1/+1 for a normal/inverse fault
- 8:
- magnitude
- 9,10:
- not used; can be 0 0; allows use of the psmeca file format
- 11:
- text string to appear above the beach ball (default) or under (add u).
to plot anisotropic part of moment tensor (zero trace). The color or shade of the compressive quadrants can be specified with the -G option. The color or shade of the extensive quadrants can be specified with the -E option. Parameters are expected to be in the following columns:
- 1,2:
- longitude, latitude of event (-: option interchanges order)
- 3:
- depth of event in kilometers
- 4,5,6,7,8,9:
- mrr, mtt, mff, mrt, mrf, mtf in 10*exponent dynes-cm
- 10:
- exponent
- 11,12:
- Not used; can be 0 0; allows use of the psmeca file format
- 13:
- Text string to appear above the beach ball (default) or under (add u).
to plot anisotropic part of moment tensor (zero trace). The color or shade of the compressive quadrants can be specified with the -G option. The color or shade of the extensive quadrants can be specified with the -E option. Parameters are expected to be in the following columns:
- 1,2:
- longitude, latitude of event (-: option interchanges order)
- 3:
- depth of event in kilometers
- 4,5,6,7,8,9,10,11,12:
- value (in 10*exponent dynes-cm), azimuth, plunge of the T, N, and P axes.
- 13:
- exponent
- 14,15:
- longitude, latitude at which to place beach ball. Entries in these columns are necessary with the -C option. Using 0,0 in columns 9 and 10 will plot the beach ball at the longitude, latitude given in columns 1 and 2. The -: option will interchange the order of columns (1,2) and (9,10).
- 16:
- Text string to appear above the beach ball (optional).
selects a symbol instead of mechanism. Choose from the following: (c) circle, (d) diamond, (i) itriangle, (s) square, (t) triangle, (x) cross. size is the symbol size in PROJ_LENGTH_UNIT (unless c, i, or p is appended to indicate that the size information is in units of cm, inches, meters, or points, respectively). If size must be read, it must be in column 4 and the text string will start in column 5. Parameters are expected to be in the following columns:
- 1,2:
- longitude, latitude of event (-: option interchanges order)
- 3:
- depth of event in kilometers
- 4:
- Text string to appear above the beach ball (default) or under (add u).
-X[a|c|f|r][x-shift[u]]
Bomford, G., Geodesy, 4th ed., Oxford University Press, 1980.
Aki, K. and P. Richards, Quantitative Seismology, Freeman, 1980.
F. A. Dahlen and Jeroen Tromp, Theoretical Seismology, Princeton, 1998, p.167. Definition of scalar moment.
Cliff Frohlich, Cliff’s Nodes Concerning Plotting Nodal Lines for P, Sh and Sv
Seismological Research Letters, Volume 67, Number 1, January-February, 1996
Thorne Lay, Terry C. Wallace, Modern Global Seismology, Academic Press, 1995, p.384.
W.H. Press, S.A. Teukolsky, W.T. Vetterling, B.P. Flannery, Numerical Recipes in C, Cambridge University press (routine jacobi)
Genevieve Patau, Laboratory of Seismogenesis <http://www.ipgp.fr/rech/sismogenese/>, Institut de Physique du Globe de Paris, Departement de Sismologie, Paris, France