Seismologist Susan Hough lectures on far-reaching earthquakes and their impact on our planet and on the science world. In 1992, the Landers earthquake struck north of Palm Springs with a magnitude of 7.3. It shook up not only the state of California, but scientists' long-held beliefs about the reach of earthquakes. Hear how the discovery of remotely trigged earthquakes radically altered the way scientists view the impact of earthquakes on the surrounding region and on the planet as a whole.