EQHazard: aftershock flag for Chiou & Youngs 2008

[Anne Hulsey]

Another feature that I would start using in September is to include the option for an aftershock flag for the Chiou & Youngs 2008 GMPE. However, based on preliminary conversation with Baker, this request may be constrained by the OpenSHA software, not the EQHazard implementation of it.

If EQHazard and OpenSHA can't handle the aftershock flag, I will need to build my own package. However, I think it is mutually beneficial for this to be implemented by SimCenter.

[elhaddad]

It seems that there is an aftershock parameter in CY2008, it defaults to false.
I will see if we can allow adjusting it.

https://github.com/opensha/opensha-core/blob/master/src/org/opensha/sha/imr/attenRelImpl/CY_2008_AttenRel.java

[elhaddad]

This is now possible by setting the Aftershock parameter to true, as follows:

"GMPE": {
      "Type": "Chiou & Youngs (2008)",
      "Parameters":
      {
         "Aftershock": true
      }
   }

It is supported by the latest preview version:
https://github.com/NHERI-SimCenter/GroundMotionUtilities/releases/tag/v1.1.1

[Anne Hulsey]

Excellent!! This will massively streamline my work flow for creating ground motion maps for an aftershock.