visualizing earthquake simulation data amit chourasia 1, steve cutchin 1, alex decastro 1, geoffrey...
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VISUALIZING EARTHQUAKE SIMULATION DATA
Amit Chourasia1, Steve Cutchin1, Alex DeCastro1, Geoffrey Ely2
1 San Diego Supercomputer Center2 Scripps Institute of OceanographyUniversity of California, San Diego
Presented By: Amit Chourasia, Visualization Scientist, SDSCPresented to: Virtual Globes SessionAGU Fall meeting, San Francisco, Dec 13th 2007
TeraShake Simulation Region
600km x 300km x 80km
Spatial resolution = 200m
Mesh Dimensions3000 x 1500 x 400 = 1.8 billion mesh
points Simulated time = 4
minutes Number of time
steps = 22,728 (0.011 sec time step)
60 sec source duration from Denali
3D Crustal structure: subset of SCEC CVM3.0
Near-surface S-wave velocity truncated at 500m/s, up to 0.5 Hz
Data
Domain Resolution: 3000x1500x400 uniform
3 scalar fields (2D and 3D, floating point) Derived data (magnitudes, vorticity, etc) Temporal (22727 steps) Size 10-50TB per simulation (potentially
430 TB) Input characteristics (volumetric
stiffness, etc)
General Questions & Problems Regions of impact Occurrence of peak velocities and there
location Understand wave propagation
How to verify and validate ? How to analyze and gain scientific
insight ? How to share information among
experts and others ?
Viz Design Evolution5
Movie
Maps7
TeraShake1.3: Spectral Acceleration at 3.0 sec
Self Contouring Technique8
TeraShake1.3: Spectral Acceleration at 3.0 sec
Geo Context
Simple Overlays City names Faultlines Major Freeways
Not sufficient
Customized color mappingBroader information overlays (minor roads, POI’s,
…..)Interactivity
Context
Population(2000 Census)
RoadRail
HospitalHarbor
.
.
.
.
.
Map service portal 11
Live Demo
Pre-cooked Demo
Map Service Movie
Google Earth Integration Movie
Pipeline
Web Browser
Colormap
Applet
Server
Back End
Data Fetch
Reformat data WGS84
Colormap
original data
Colormap transformed data
Request
Publish
Execution
Colormaping: SVT, TEEM
Software
Scalable Visualization Toolkit* (batch volume rendering)
Deskvox, Meshviewer (interactive volume rendering)
Storage Resource Broker* (SRB) Teem toolkit * Google Earth
* TeraGrid friendly
Future Work
Find/develop novel techniques to visually represent data Methods to measure and quantify errors Effective visualization tools and services Temporal animations methods
Make visualizations accessible
References
Visual Insights into High-Resolution Earthquake Simulations. IEEE Computer Graphics and Applications ,vol. 27, no. 5, pp. 28-34, September/October, 2007
Enabling very-large scale earthquake simulations on parallel machines. "Advancing Science and Society through Computation", International Conference on Computational Science 2007, Part I, Lecture Notes in Computer Science series 4487, pp. 46-53, Springer
Strong shaking in Los Angeles expected from southern San Andreas earthquake, Geophys. Res. Lett. 33, L07305,doi:10.1029/2005GRL025472
Acknowledgements
Contributors
Natalie Rubin, Lucas Gilbert, John Moreland
Scientists
Kim Olsen, Steve Day, Bernard Minster, Tom Jordan, Phil Maechling, Yifeng Cui, Reagan Moore
Southern California Earthquake Center (SCEC) San Diego Supercomputer Center (SDSC)
Funding
National Science Foundation
Thanks for your Patience
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Webpage: http://visservices.sdsc.edu/scecEmail: amit # sdsc.edu