Difference between revisions of "SW4 Mesh Development"

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#    ny=
 
#    ny=
 
#    nz=
 
#    nz=
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== Example from CyberShake ==
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 +
 +
We don't actually generate a ucvm2mesh config file as part of the process of creating CyberShake meshes, but I've created what I think is the correct ucvm2mesh file for USC.  The rotation angle is -55 degrees, and the 4 corners should be about:
 +
 +
    -122.46716    34.52173 (x=      0.000 y=      0.000)
 +
    -119.66138    37.97316 (x=    460.000 y=      0.000)
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    -113.59525    34.44267 (x=    460.000 y=    672.000)
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    -116.52591    31.13175 (x=      0.000 y=    672.000)
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 +
Rob might use a different projection system, so I'd only expect the corners to agree to 3 or so decimal places.
  
 
== Query points with missing Data ==
 
== Query points with missing Data ==

Revision as of 17:24, 4 April 2024

Goal: Create NorCal CyberShake Mesh for SW4

Mesh Region

Region should match the SFBR model https://www.usgs.gov/programs/earthquake-hazards/science/3-d-geologic-and-seismic-velocity-models-san-francisco-bay

  • ne_coord (-122.562365, 39.174505)
  • nw_coord (-123.858493, 38.424179)
  • sw_coord (-121.922036, 36.320331)
  • se_coord (-120.644051, 37.050062)
  • spacing=25.0

Config Script

  • input 4 corners (and projection) and spacing
  • calc rotation angle
  • distance between points
  • calculate nx, ny, nz based on spacing

Define Region

  • origin
  • rotation angle
  • distance x
  • distance y
  • distance z
  • spacing

Low Res UCVM2Mesh Configuration for SFBR Model

To test our mesh formats for SW4, we will test with a low resolution

  1. rot=-53.9
  2. x0=-123.858493
  3. y0=38.424179
  4. z0=0.0
  5. spacing=500.0
  6. Dist x = 140,000
  7. Dist y = 290,000
  8. Dist z = 40,000
  9. nx=280
  10. ny=580
  11. nz=80

Full Res UCVM2Mesh Configuration for SFBR Model

  1. rot=-53.9
  2. x0=-123.858493
  3. y0=38.424179
  4. z0=0.0
  5. spacing=25.0
  6. Dist x = 140,000
  7. Dist y = 290,000
  8. Dist z = 60,000
  9. nx=
  10. ny=
  11. nz=

Example from CyberShake

We don't actually generate a ucvm2mesh config file as part of the process of creating CyberShake meshes, but I've created what I think is the correct ucvm2mesh file for USC. The rotation angle is -55 degrees, and the 4 corners should be about:

   -122.46716     34.52173 (x=      0.000 y=      0.000)
   -119.66138     37.97316 (x=    460.000 y=      0.000)
   -113.59525     34.44267 (x=    460.000 y=    672.000)
   -116.52591     31.13175 (x=      0.000 y=    672.000)

Rob might use a different projection system, so I'd only expect the corners to agree to 3 or so decimal places.

Query points with missing Data

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