Visualizing

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• Visualizing
• TERASHAKE
• Amit Chourasia
• Visualization Scientist
• Visualization Services
• San Diego Supercomputer center
• Geon Visualization Workshop March 1-2, 2005

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About Terashake

• Large Scale Earthquake Simulation on Southern San
  Andreas
• 33 researchers, 8 Institutions
• Southern California Earthquake Center
• San Diego Supercomputer Center
• Information Sciences Institute
• Institute of Geophysics and Planetary Physics
  (UC) University of Southern California
• San Diego State University
• University of California, Santa Barbara
• Carnegie-Mellon University
• ExxonMobil

Slide Courtesy Marcio Faerman
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About Terashake

• Description of fault structure
• Description of velocity model (anelastic seismic
  wave propagation speed through sediment basins
  and through rock)
• Validation of the anelastic seismic wave
  propagation code
• Description of the expected fault rupture
  scenario
• Greek!!!

Slide Courtesy Marcio Faerman
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TeraShake Simulation Area

• Rectangular region parallel to San Andreas fault
  containing
• Los Angeles,
• San Diego,
• Mexicali,
• Tijuana,
• Ventura Basin,
• Fillmore,
• Southern San Joaquin Valley,
• Catalina Island,
• Ensenada
• 600 x 300 x 80 km

Slide Courtesy Marcio Faerman
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TeraShake Earthquake Simulation

• Magnitude 7.7 earthquake on southern San Andreas
• Mesh of 1.8 Billion cubes, 200 m
• 0.011 sec time step, 20,000 time steps 3 minute
  simulation
• Kinematic source from Cajon Creek to Bombay Beach
  
• 75 sec source duration
• 18,886 point sources
• 240 processors on San Diego SuperComputer Center
  DataStar
• 20,000 CPU hours, over approximately 5 days
  wall clock
• 47 million megabytes of output
• Asynchronous rendering of simulation output
  during ongoing computation

Slide Courtesy Marcio Faerman
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Vista

• It is a multithreaded, platform independent,
  scalable and robust volume renderer uses out of
  core paging. Vista is built on Scalable
  Visualization Toolkit (SVT)

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What Vista can do?

• Volume Render any size volume using out of core
  paging
• Large Image resolutions - any resolution possible
• Create walk around
• data segments
• Handles 2D meshes
• IsoVoluming
• lt-gtIsoSurfacing

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About Data
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Go! Visualize

• Velocity components
• (Volumes and Surfaces)

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Visualize ?what?

• Velocity within specific range
• Color ramps easily understood by scientists.

250.0                              250.0
cm/s
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Visualize ?what?

• Context Geographic location
• Context Fault lines
• Simulation Time

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Visualize ?what?

• Velocity components and magnitudes
• Velocity Cumulative peaks
• Velocity range and color schema

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One of the Surface Viz

• Movie Clip

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One of the Volume Viz

• Movie Clip

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Current Viz Effort

• Wave propagation in 3d
• Topography with wave propagation
• Movie Clip1 Movie Clip2
• Without 3d Terrain With 3d Terrain

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Tools we use

• Vista (Scalable Visualization Toolkit SVT)
• Command line volume renderer (Works!)
• Mesh Viewer
• Interactive Volume renderer (Java based)
• Maya
• Adobe suite
• Other things that work

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More Visualizations

• Visit website
• http//vistools.npaci.edu/
• See Software and Examples
• SCEC Visualizations
• http//vistools.npaci.edu/examples/scec.htm

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Current Viz not enough ?Need more?what?

• Curl
• Divergence
• Directivity
• ?
• ??
• ???

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Is 2d the ?limit?

• Ease in navigation/orientation by scientists?
• Ease of 3d perception on monitor?
• What are interest zones/regions?
• Analysis methods for 3d data?
• ???
• Are we ready for volumetric Visualization?

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TeraShake2

• 16 large scale simulations
• 250 Tbytes
• 480 wave propagation simulations
• 2.5 Tbytes
• Integration between synthetic and observed data
• Inversion studies Frechet Kernel database

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• Thanks for your patience!

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• ? - ?