Guest: Simon Winchester.

On April 18, 1906, a magnitude 8.5 earthquake rocked San Francisco and left the city in ruins within a minute. Today on Focus, geologist and author Simon Winchester joins the show to talk about the event's impact on human history and how recent scientific advances have revealed the ancient subterranean processes that fueled it—and almost certainly will cause history to repeat itself.

Guest: Simon Winchester.

On April 18, 1906, a magnitude 8.5 earthquake rocked San Francisco and left the city in ruins within a minute. Today on Focus, geologist and author Simon Winchester joins the show to talk about the event's impact on human history and how recent scientific advances have revealed the ancient subterranean processes that fueled it—and almost certainly will cause history to repeat itself.

Guest: Simon Winchester.

On April 18, 1906, a magnitude 8.5 earthquake rocked San Francisco and left the city in ruins within a minute. Today on Focus, geologist and author Simon Winchester joins the show to talk about the event's impact on human history and how recent scientific advances have revealed the ancient subterranean processes that fueled it—and almost certainly will cause history to repeat itself.

Guests: Jake Page and Charles Officer.

The three largest earthquakes in American history took place in the early 1800s—not along the San Andreas Fault as one might expect, but in Missouri. The gargantuan tremors rent apart a region the size of Texas and killed some 1,500 people. Could a disaster like this happen again? Today on Focus, we're joined by writer Jake Page and author Charles Officer to discuss the likelihood of a repeat event and how seismologists are working to be able to predict it.