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