[cig-commits] [commit] devel, master: Updated notes on using the synthetics held in the EXAMPLES directory CMTSOLUTION and half duration Post Processing Long Records and those with Small Epicentral Distances (ed5d0d7)

[cig_noreply at geodynamics.org]

Repository : https://github.com/geodynamics/specfem3d_globe

On branches: devel,master
Link       : https://github.com/geodynamics/specfem3d_globe/compare/bc58e579b3b0838a0968725a076f5904845437ca...be63f20cbb6f462104e949894dbe205d2398cd7f

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commit ed5d0d760921f8bdbf2cd4f0e1e4758732526714
Author: Brian Savage <savage13 at gps.caltech.edu>
Date:   Mon Sep 17 14:58:21 2007 +0000

    Updated notes on using the synthetics held in the EXAMPLES directory
    CMTSOLUTION and half duration
    Post Processing Long Records and those with Small Epicentral Distances


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ed5d0d760921f8bdbf2cd4f0e1e4758732526714
 readme | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/readme b/readme
index 4e1bfdc..f91afe3 100644
--- a/readme
+++ b/readme
@@ -5,7 +5,7 @@ Each directory corresponds to an experiement
 normal-mode vs. sem which is hopefully sufficiently defined 
 by the directory's name 
 
-The standart contents of each directory are the following:
+The standard contents of each directory are the following:
 QMXD/	*.qmxd.bz2 : ascii unprocessed qmxd-seismograms 
 	 DATA/ : cmt and stations files 
 		and command line launching the qmxd script 
@@ -19,8 +19,28 @@ processing : processing script
 	    needs process_synt.pl and rotate.pl
 	    (in SPECFEM3D_GLOBE_V4.0/UTILS/)
 
-CMTSOLUTION :
+CMTSOLUTION : input file for processing
 STATIONS    : input files for processing  
 
+Computing Benchmarks:
+To compute synthetics which match with those in each directory, use
+the CMTSOLUTION and STATIONS files located at
+	prem_*/SEMD/DATA/CMTSOLUTION
+	prem_*/SEMD/DATA/STATIONS
+The SEMD/DATA/CMTSOLUTION has the "half duration" set to 0.0 seconds as opposed to 
+the CMTSOLUTION in each base directory (prem_*/CMTSOLUTION) which has 
+the "half duration" set to a value used in post processing to agree 
+with the filtering.
+
+Post Processing Concerns for Small Epicentral Distances or Long Records:
+Post processing scripts such as ./process_syn.pl use a taper before filtering to
+reduce artifacts due to possible steps occurring at the beginning and end of 
+seismograms.  This taper, implemented in the program SAC, determines the taper width
+based on the length of the record, defaulting to 5% of the beginning and end of 
+the record.  For records with small epicentral distances the arrivals are near the 
+beginning of the seismogram and have a good possibility of being reduced in amplitude
+as a result of the filter.  This may result in a mismatch between the SEMD synthetics 
+and those computed in another fashion (QMXD).
 
 Anne 22/08/2007
+Brian Savage 17/09/2007