HighF 2018

This page documents the High-F activities and decisions for the 2018 verification and validation runs for three groups: Olsen et al. (AWP), Graves (RWG) and Taborda et al. (Hercules).

Mesh generation rules and parameter constraints

Velocities

• 1. Set Min Vs=500 m/s
• 2. If Vs was lower than 500 m/s and adjusted, then adjust Vp with original Vp/Vs ratio (so that we don’t have the automatic Vs/Vp of 3). We may want to set a minimum value of Vp (Rob to check)
• 3. Then set Max Vp/Vs= 3, if lower Vp to maintain the max of 3 ratio

Lame parameters (mu and lambda)

Use mu and Lambda parameters to fix Vp/Vs issues in the CVM where necessary, as part of the mesh generation. Need to make sure that patches are physical and not only to make the codes run.

• Rob to check if raw model produces lambda of <=zero.
• Note: lambda of zero corresponds to Vp/Vs= sqrt(2)=1.45
• Note: typical Vp speeds are 330 m/s in air, 1450 m/s in water and about 5000 m/s in granite

Anelastic attenuation (Q)

Frequency-independent Q definition

• Qs=100*Vs(km/s)
• Qp=2*Qs

Upper frequency

• 5Hz: based on 500 m/s and 20 m spacing
• Kim and Rob have been low-pass filtering the slip function at 5 Hz
• Ricardo and Naeem don’t filter the source

Source Models

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Simulation results

Results shared on March 5 2018

Description: results for the small region from November 10 2017:

Description: small region simulations for Hercules, AWP (updated since November 2017) and RWG (medium size model to avoid boundary reflexions):

Related Pages

• High-F Main page

• Past verification (HighF_v14.12_Data)

• La Habra simulations on Titan

• La Habra Simulation region
• La Habra Observational data