At 5:12 in the morning on April 18, 1906, about a minute of seismic shaking tore up San Francisco, toppling buildings, particularly those on landfill and swampy ground, cracking and shifting others, collapsing chimneys, breaking water mains and gas lines, twisting streetcar tracks, even tipping headstones in the cemeteries. It was a major earthquake, centered right off the coast of the peninsular city, and the damage it did was considerable. Afterward came the fires, both those caused by broken gas mains and chimneys and those caused and augmented by the misguided policy of trying to blast firebreaks ahead of the flames and preventing citizens from firefighting in their own homes and neighborhoods. The way the authorities handled the fires was a major reason why so much of the city—nearly five square miles, more than twenty-eight thousand structures—was incinerated in one of history’s biggest urban infernos before aerial warfare. Nearly every municipal building was destroyed, and so were many of the downtown businesses, along with mansions, slums, middle-class neighborhoods, the dense residential-commercial district of Chinatown, newspaper offices, and warehouses.
