[Shake-dev] Another update

[Bruce Worden]

Hi all,

I've again updated the repository. There are only a few changes, but  
one of them is relatively important for some users. As usual, 'svn  
update' will get the new code, and 'make' will install it. There are  
no special install instructions.

o Youngs97: This GMPE has had an error in one of the coefficients for  
some time. We have fixed the error. The result will be a significant  
decrease in PGV and PSA 1.0 sec amplitudes. At the same time, I have  
updated the way the amplitudes are scaled to peak component (the  
Youngs et al. relation gives a mean component). We previously used a  
factor of 1.15, but Beyer & Bommer (2006) indicate that 1.10 is  
appropriate for PGA and PSA, and 1.0 for PGV. Thus, there will be an  
additional ~15% reduction in PGV amps, and about 5% for everything  
else. In many cases these differences will have been erased by the  
bias correction, but it is probably worth rerunning your important  
events with the updated module.

o AK07: This GMICE uses distance and magnitude correction terms. The  
distance measure is specified as fault or hypocenter distance, but the  
module was using Rjb. This has been corrected. The effect is likely  
minimal for most situations.

o grind: A minor fix to the code that generates output for plotregr.  
The bug would only have affected plotregr plots for users of Youngs97,  
and was fairly subtle, but would have resulted in the plotted  
amplitudes being slightly low. Again, this only affected the plotregr  
output -- the maps, grids, etc. were unaffected.

o Software Guide: Some old, obsolete instructions were deleted. A bit  
of text about plotregr was added.

Let me know if you have any problems.

Bruce