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Add ERM-N and ERM-S fault sources.

Shumway, Allison Michaelrequested to merge
ghsc/users/ashumway/nshm-conus:ERM-N_and_ERM-S into main

For the 2023 NSHM for CONUS, the ERM-N and ERM-S sources have been updated from fault-zone polygons to fault sections (Thompson Jobe et al., 2022a[doi: 10.5066/P94HLE5G],b[doi: 10.1785/0220220162]).

ERM-N:

  • The fault length for the ERM-N rupture scenario is slightly increased from CEUS SSCn (2012) based on revised intersection with the Reelfoot fault from Delano et al. (2021). Fault length is 85 km.  
  • The Eastern Rift Margin (North) fault logic tree as a whole has the ID: 3800.
  • Mmax distribution is unchanged from 2014/2018 NSHM update (Table H-5.6-2).
  • Rate data remain unchanged from 2014/2018 NSHM update, however, we now use the full CEUS SSCn (2012) tables (H-5.6-6 and H-5.6-7) for additional epistemic uncertainty.

ERM-S:

  • The fault length for the ERM-S rupture scenario is slightly increased from CEUS SSCn (2012) based on revised intersection with the Reelfoot fault from Delano et al. (2021). Fault length is 102 km.  
  • The fault either ruptures to the southwest (Crittenden County) or the southeast (Meeman-Shelby): Eastern Rift Margin (South) [3802], Eastern Rift Margin (South Extension) [3803], Crittenden County [3806] or Eastern Rift Margin (South) [3802], Meeman-Shelby [3804]
  • Mmax distribution is unchanged from 2014/2018 NSHM update (Table H-5.6-1).
  • Rate data remain unchanged from 2014/2018 NSHM update, however, we now use the full CEUS SSCn (2012) tables (H-5.6-3, H-5.6-4, and H-5.6-5) for additional epistemic uncertainty.

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