Add support for missing HI GMMs
Created by: pmpowers-usgs
The 1998 Hawaii NSHM requires Campbell (1997) and Munson & Thurber (1997)
Created by: pmpowers-usgs
The 1998 Hawaii NSHM requires Campbell (1997) and Munson & Thurber (1997)
Created by: pmpowers-usgs
Completed in PR #134