Difference between revisions of "HighF 2018"
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== Mesh generation rules and parameter constraints == | == Mesh generation rules and parameter constraints == | ||
| − | === Velocities | + | === Velocities === |
* 1. Set Min Vs=500 m/s | * 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) | * 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 | * 3. Then set Max Vp/Vs= 3, if lower Vp to maintain the max of 3 ratio | ||
| − | === Lame parameters=== | + | === 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. | |
* Rob to check if raw model produces lambda of <=zero. | * Rob to check if raw model produces lambda of <=zero. | ||
* Note: lambda of zero corresponds to Vp/Vs= sqrt(2)=1.45 | * Note: lambda of zero corresponds to Vp/Vs= sqrt(2)=1.45 | ||
Revision as of 17:37, 5 March 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).
Contents
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.
- 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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