The TeraShake simulations modeled the earth shaking that would rattle Southern California if a 230 kilometer section of the San Andreas fault ruptured producing a magnitude 7.7 earthquake. Two rupture scenarios were simulated, one rupturing from north to south, beginning near Wrightwood, California, and a second one rupturing from south to north, starting near Bombay Beach, California. To model this region, the simulations used a 3,000 by 1,500 by 400 mesh, dividing the volume into 1.8...