Nearly a century separates two views of the same street corner in San Francisco—one (top) after a massive earthquake devastated the city in 1906, the other (bottom) as the corner appeared in 2003.

These images are part of a new book and exhibit called After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire by Mark Klett, with Michael Lundgren.

Despite the passage of time, experts warn that quake-prone San Francisco may be scarcely better prepared for a major temblor today than it was a century ago.

If a quake as strong as the 1906 event struck today, almost 40 percent of San Francisco's buildings would likely be destroyed. Fires would again rage, bridges would fail, and the water supply could be completely severed, experts say.