SimCenter Forum

Research in Natural Hazards Engineering => Regional Hazard Simulation (R2D, rWhale) => Topic started by: Anne Hulsey on May 28, 2020, 09:48:42 PM

Title: EQHazard: aftershock flag for Chiou & Youngs 2008
Post by: Anne Hulsey on May 28, 2020, 09:48:42 PM

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.

Title: Re: EQHazard: aftershock flag for Chiou & Youngs 2008
Post by: elhaddad on May 28, 2020, 10:29:30 PM

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

Title: Re: EQHazard: aftershock flag for Chiou & Youngs 2008
Post by: elhaddad on May 29, 2020, 11:51:25 PM

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

Title: Re: EQHazard: aftershock flag for Chiou & Youngs 2008
Post by: Anne Hulsey on May 30, 2020, 09:31:40 PM

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