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Visualizing TERASHAKE

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Visualizing TERASHAKE Powered By Docstoc
					             Visualizing
            TERASHAKE
              Amit Chourasia
           Visualization Scientist

          Visualization Services
     San Diego Supercomputer center

Geon Visualization Workshop March 1-2, 2005
              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
         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
      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
 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
                  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)
         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
         <->IsoSurfacing
                   About Data
Scalar Surface (floats) Scalar Volume (floats)
• 3000 x 1500                  • 3000 x 1500 x 400
   ie 600 km x 300 km             ie 600 x 300 x 80 km^3
   =17.2 MB per timestep          =7.2 GB per timestep
• 20,000 timesteps             • 2,000 timesteps
• 3 variables Vx, Vy & Vz      • 3 variables Vx, Vy & Vz
    Velocity components            Velocity components
• Total Scalar data = 1.1 TB   • Total Vol data = 43.2 TB
Other Data – check
                               Grand Total = 47.4 TB
points,etc
           Go! Visualize
• Velocity components
                 (Volumes and Surfaces)




          -0.1          +0.1
              Visualize ?what?
   • Velocity within specific range
   • Color ramps easily understood by
     scientists.




250.0            +250.0 cm/s   -50.0    +50.0 cm/s
            Visualize ?what?
• Context – Geographic location
• Context – Fault lines
• Simulation Time
             Visualize ?what?
  • Velocity components and magnitudes
  • Velocity Cumulative peaks
  • Velocity range and color schema




0.0            250.0 cm/s   -50.0        +50.0 cm/s
      One of the Surface Viz
• Movie Clip
      One of the Volume Viz
• Movie Clip
                Current Viz Effort
• Wave propagation in 3d
• Topography with wave propagation
• Movie Clip1           Movie Clip2
Without 3d Terrain         With 3d Terrain
             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
         More Visualizations
Visit website
• http://vistools.npaci.edu/
See Software and Examples

SCEC Visualizations
• http://vistools.npaci.edu/examples/scec.htm
Current Viz not enough ?Need more?what?
•   Curl
•   Divergence
•   Directivity
•   ?
•   ??
•   ???
            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?
      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
Thanks for your patience!
?-

				
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posted:10/22/2011
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