This is a modification of gmsim_v16.1.1 based on the work of Robin Lee in 2017/2018. This version implements a single change:
Changing the HF path duration from Dp = 0.07R to the Boore and Thomson (2014) (https://pubs.geoscienceworld.org/ssa/bssa/article-abstract/104/5/2541/351523) path duration developed using the NGA-West2 database.
This change to increase the HF path duration was a result of the durations simulated ground motion duration being identified as too short when compared to observed ground motions.
Background
Lee et al. (20162019) simulated 146 small magnitude earthquakes (3.5<Mw<5.0) in the Canterbury region with 1854 high-quality observed ground motions recorded across 43 strong motion stations. Using mixed-effects analysis, the results identified that the simulated path durations appeared too short relative to observed ground motions. Several features provide evidence for this conclusion.
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Computational Implementation
The path duration model was already programmed into the HF simulation fortran code as model number 11, hence the path_dur is set to be 11 for this version.
Additionally, a new time window function was required for this model, this was added into the HF simulation fortran code for version 5.4.5.1, hence the hf version is set to be 5.4.5.1.
With the binary and yaml workflow, the root_defaults.yaml script should be the following for a 100m grid run:
computational implementation of this modification is to change the "hf_path_dur" variable in the params.py file to '11':hf_path_dur = '11'