Difference between revisions of "HighF 2018"
From SCECpedia
Jump to navigationJump to search| Line 1: | Line 1: | ||
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). | 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 | + | == Mesh generation rules and parameter constraints == |
| − | + | === Velocities (fixing the CVM for meshing purposes) === | |
| − | Velocities (fixing the CVM for meshing purposes) | ||
* 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=== |
| − | Rob to check if raw model produces lambda of <=zero. | + | * mu and lambda (fixing the CVM for meshing purposes) |
| + | * 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 | |
Revision as of 17:35, 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 (fixing the CVM for meshing purposes)
- 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 (fixing the CVM for meshing purposes)
- 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
Lorem ipsum
