Questions on new Regional Resilience Determination (R2D) Tool

[nsk]

Kudos to the team for developing this tool!

Some questions from trying out the tool:
1. What kind of assessment is this intended for (i.e., scenario-based assessment, intensity-based, risk-based)?
2. What is the basis for selecting records in the HAZ tab (EQ scenario simulation)? If it is to match a given target spectrum, is this an intensity-based assessment? Does the record selection depend on the choice for "Earthquake Rupture"?
3. If "Earthquake Rupture Forecast" (ERF) is chosen, what is meant by "Earthquake Name" since ERF typically includes a collection of different plausible ruptures?
4. In ANA tab, what is meant by "IMasEDP"?
5. In DL tab, what is meant by "Hazus MH EQ" and "Hazus MH EQ IM"?
6. In DL tab, what is meant by "Include ground failure"?

[kuanshi]

Thank you for these great questions, nsk! I'm happy to respond to the first three mainly related to the HAZ tab.
1. The hazard and ground motion selection module mainly supports scenario-based simulation (given an earthquake scenario, simulating the resulting spatial correlated intensity map and selecting ground motions).
2. The ground motions for each grid site are selected based on the site's target response spectra (including median and standard deviation). The target response spectra are computed conditional on the given magnitude and site-to-source distance. Meanwhile, both the inter-event and between-event correlations are considered in computing these target spectra.
3. The "Earthquake Name" is taken by the tool to look for rupture sources whose name contains the "Earthquake Name" string in the ERF. The tool would also filter the plausible ruptures by the user-defined earthquake characteristics (e.g., magnitude) if any. And then the tool would randomly sample one plausible rupture in the remaining ruptures for the selected earthquake scenario.

[steveg]

Hi nsk, I will respond to questions 4-6:

4. In ANA tab, what is meant by "IMasEDP"?

The IMasEDP option is mainly used when the user does not wish to employ a building response model. Specifically, when the option "None" is selected in the MOD tab.  In this case, the intensity measure (IM) is considered the engineering demand parameter (EDP). Hence the name IMasEDP.

5. In DL tab, what is meant by "Hazus MH EQ" and "Hazus MH EQ IM"?

Hazus MH EQ and Hazus MH EQ IM are the two available loss methodologies under the Pelicun option in the DL tab.  Both options employ data from the Hazards U.S. Multi-Hazard (HAZUS-MH) project and are intended for earthquake damage and loss analysis. The first option, Hazus MH EQ, expects the inputs to include standard EDPs for earthquakes such as peak interstory drift ratio (PID), peak floor acceleration (PFA), peak roof drift (PRD), and peak floor displacement (PFD). The second option, Hazus MH EQ IM, is more rudimentary, and only expects an intensity measure, e.g., peak ground acceleration (PGA) as an input.

6. In DL tab, what is meant by "Include ground failure"?

The user has the option to include vertical and horizontal ground deformation as an additional input to the damage and loss calculations. Please see Example 5 - Ground shaking and liquefaction, for an example of when ground failure is included.