This is the modification of gmsim_v15.1.1 based on the work of Robin Lee in 2017/2018. Specifically,
-Removing the long period site amplification (or reducing to a 1-2s taper as opposed to the previous 2-5s taper?)
- Changing the HF path duration from Dp = 0.07R to the Boore and Thomson (2014) path duration developed using the NGA-West2 database.
---More details needed here.