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cross section input values for atten_variability_method and atten_spawn_bins #66

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
If an EQRM user assigns atten_variability_method=2 (i.e. spawning fo GM 
aleatory uncertainty) and does not assign atten_spawn_bins in the controlfile 
the EQRM will use a default value of atten_spawn_bins = 1. This effectively 
ammounts to a single bin with spawning and hence the exclusion of aleatory 
ground motion uncertainty altogether. 

This is a potential confusion for EQRM users who may think they are (and 
probably want to be) spawing becuase they have set atten_variability_method=2. 
This confusion has occured already. 

RECOMENDATION: 
* set atten_spawn_bins(DEFAULT)=5 if atten_variability_method=2, else set
atten_spawn_bins(DEFAULT)=1

Original issue reported on code.google.com by RobinsonDavidJ0@gmail.com on 9 Aug 2012 at 4:17