New USGS-Adjusted subduction GMMs for Alaska
There are AK review panel concerns about over-prediction of NGA-Sub interface GMM ground motions (both global and Alaska regionalized models). We are therefore going to implement bias-corrected versions of the three that we intend to use for subduction interface:
AG_20_GLOBAL_INTERFACE
KBCG_20_GLOBAL_INTERFACE
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PSBAH_20_ALASKA_INTERFACE
PSBAH_20_GLOBAL_INTERFACE
Tasks:
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The attached values should be put in a separate coefficients file and brought in to each GMM class (see the NGA-East adjustments as an example). Use the average of 0.01s and 0.03 s for 0.02s. Use the 1s value for PGV. Pass in the slab() flag to the constructor and set the correction to 0 if true. -
Add a akBiasCorrection() method that can be overridden in subclasses. -
The bias corrections values are log-normal and so just need to be subtracted from the final mean value conditioned the above method returning true. -
bias_nga: Interface_adj.csv -
bias_nga: Interface_adj-v2.csv
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bias_nga_new: Interface_adj_Combined_NGA_New.csv
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bias_new: Interface_adj_Post_NGA_only.csv