	$Id: README.meca,v 1.2 2000/12/29 22:10:37 pwessel Exp $

Dear colleagues,

psvelomeca is separated into psvelo and psmeca

psmeca plots focal mechanisms.

Modifications :
 - depth is in third column (in order to use the same file with pscoupe)
 - scale is size of beach ball for magnitude 5
   that is scalar moment = 4e+23 dynes.cm
   instead of 1e24 dynes.cm
   The formula used is the one of
       Thorne Lay, Terry C. Wallace,
       Modern Global Seismology,
       Academic Press p.384.

Additions :
  - plot P and T axis
  - plot moment tensor
  - plot events between depth min and max
  - plot events with color of compressive quadrants
    function of depth

psvelo plots velocity ellipses, strain crosses and strain wedges.

It is a part of the GMT supplemental archive, so it can be installed
automatically via install_gmt.

The scripts meca_1.csh (psmeca) meca_2.csh (pscoupe) meca_3.csh
(pspolar) and meca_4.csh (psvelo) will generate meca_1.ps,
meca_2.ps, meca_3.ps and meca_4.ps.


Psmeca plots seismic moment tensor and/or double couples on a map.
Pscoupe plots seismic moment tensor and/or double couples on a 
cross-section. 
Pspolar plots polarities on the lower half-sphere.
Psvelo plots velocity ellipses, strain crosses, or strain wedges on a map.


Genevieve Patau  

Institut de Physique du Globe de Paris
Departement de Sismologie
Case 89; 4 Place Jussieu
75252 Paris Cedex 05
Tel: (33) (0)1 44 27 47 79
Telex:202810 Volsism
Fax: (33) (0)1 44 27 38 94
E-mail: patau@ipgp.jussieu.fr
