California's Earthquake Threat: Reading answers

California's Earthquake Threat California may be in danger of losing its major cities. Several along the coast were built upon a dangerous section of fault line known for ferocity and speed. Some faults can send earthquakes zooming along the ground faster than the speed of sound, scientists say—and California's San Andreas Fault may be one of them. Most earthquake faults "unzip" at around 3 kilometers a second. But evidence is growing that some faults can send quakes zooming much faster—up to 6 kilometers a second. "They are moving faster than the speed of sound, like a sonic boom," said Reah Kapur, a seismologist at Wentworth University in the U.K. These hasty earthquakes cause much more…