[cig-commits] r12753 - in seismo/3D/SPECFEM3D_GLOBE/trunk: . version41_beta/src

[dkomati1 at geodynamics.org]

Author: dkomati1
Date: 2008-08-29 18:22:36 -0700 (Fri, 29 Aug 2008)
New Revision: 12753

Modified:
   seismo/3D/SPECFEM3D_GLOBE/trunk/model_iasp91.f90
   seismo/3D/SPECFEM3D_GLOBE/trunk/version41_beta/src/model_iasp91.f90
Log:
added a comment about the density model we use for IASP91 (which does not provide one
by default)


Modified: seismo/3D/SPECFEM3D_GLOBE/trunk/model_iasp91.f90
===================================================================
--- seismo/3D/SPECFEM3D_GLOBE/trunk/model_iasp91.f90	2008-08-30 00:15:53 UTC (rev 12752)
+++ seismo/3D/SPECFEM3D_GLOBE/trunk/model_iasp91.f90	2008-08-30 01:22:36 UTC (rev 12753)
@@ -31,6 +31,11 @@
 ! from B. L. N. Kennett and E. R. Engdahl, Traveltimes for global earthquake location
 ! and phase identification, Geophysical Journal International, vol. 105, p. 429-465 (1991)
 
+! we use the density model of PREM (or close to PREM in the crust)
+! because IASP91 does not provide a density model.
+! Note that "ttimes" from the official IASP91 package uses a slightly different
+! model: scaling of the P wave velocity based on Birch's law. Both options are fine.
+
   implicit none
 
   include "constants.h"

Modified: seismo/3D/SPECFEM3D_GLOBE/trunk/version41_beta/src/model_iasp91.f90
===================================================================
--- seismo/3D/SPECFEM3D_GLOBE/trunk/version41_beta/src/model_iasp91.f90	2008-08-30 00:15:53 UTC (rev 12752)
+++ seismo/3D/SPECFEM3D_GLOBE/trunk/version41_beta/src/model_iasp91.f90	2008-08-30 01:22:36 UTC (rev 12753)
@@ -31,6 +31,11 @@
 ! from B. L. N. Kennett and E. R. Engdahl, Traveltimes for global earthquake location
 ! and phase identification, Geophysical Journal International, vol. 105, p. 429-465 (1991)
 
+! we use the density model of PREM (or close to PREM in the crust)
+! because IASP91 does not provide a density model.
+! Note that "ttimes" from the official IASP91 package uses a slightly different
+! model: scaling of the P wave velocity based on Birch's law. Both options are fine.
+
   implicit none
 
   include "constants.h"