On This Day in 1994: The Northridge Earthquake

On this day in 1994, at 4:30 in the morning, a magnitude 6.7 earthquake broke on a fault nobody had mapped, directly beneath a city of ten million people. The shaking lasted about eight seconds. It killed 57 people, injured more than 9,000, and pushed 20,000 residents out of their homes. Damage came to roughly 20 billion dollars, which made it the most expensive American earthquake to that point.

The failures that mattered most were the ordinary ones. Freeway overpasses dropped, cutting the routes people used to reach work and family for months. Water mains and gas lines broke, so taps ran dry in neighborhoods that had no structural damage at all. Power went out across the basin before sunrise, which meant most people met the emergency in the dark, without information.

Northridge was not the Big One, and that is the useful part. A moderate quake under a populated area still severed water, power and roads at once, and the households that fared best had already stored water and kept a way to see and hear. Knowing how to be prepared for an earthquake matters more than knowing which fault will move, and in a sprawling city it pairs with knowing your earthquake evacuation routes before the bridges are gone.