Here’s what earthquake magnitudes mean—and why an 8 can be so much(03)

Here’s what earthquake magnitudes mean—and why an 8 can be so much(03)

Image Gallery: Oakland Earthquake: Breaking News & Updates

Oakland Magnitude 2.9 quake rattles city from underneath Caldecott Tunnel Gov. Gavin Newsom signs emergency declaration after 7.0 NorCal Oakland Earthquake Tremors Rock the Bay Area Latest Updates Here’s what earthquake magnitudes mean—and why an 8 can be so much Surgeon Recalls Rescue During 1989 Loma Prieta Earthquake Massive Earthquakes Emergency Imposed Latest Updates Breaking