Use of Fast Multipoles For Earthquake Modeling

18 October 2000


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Table of Contents

Use of Fast Multipoles For Earthquake Modeling

Problem Common to Many Fault Mechanics Numerical Computations

Outline of Talk

Present Parkfield Model Includes

Example of Grid for Parkfield

Hypocenter with 3 Sized Cells

10 Years Before - Everything Quiet

1 hour Before - Hypocenter Cell 1000x Ave.

1 Min. Before - Hypocenter Cell 105 x Ave.

Fastest Strain Rate on Surface

Increase of Slip Rate Before EQ

Possibility for Predicting Time

Overlay of Parkfield Microseismicity

Summary of Previous Results

Outline of Talk

Idea of Multipole Approximation

Hierarchical Structure of Multipoles

Spatially Adaptive Character of Multipole Approach

Additional Approaches to Make it Fast

Space Filling Curves

Additional Approaches to Make it Fast

A Library Exists That Implements The Fast Multipole Method

Outline of Talk

Steps Taken

Execution Time vs. Number of Elements

PPT Slide

PPT Slide

Future

Conclusions

Author: Terry E. Tullis

Email: Terry_Tullis@brown.edu

Home Page: www.geo.brown.edu/faculty/ttulllis/index.html