What led to San Francisco catching fire as it did after the great 1906 earthquake?

by Wildfire9

The photos look damn dramatic, was it poor wooden construction, bad urban planning, or did it start at an oil refinery?

MrDowntown

The earthquake ruptured the gas mains even as it allowed ignition accidents in various ways from the hundreds of open flames being used for lighting and cooking. The wooden buildings caught fire easily, and the water mains damaged by the quake were useless for firefighting. The city was rebuilt with brick cisterns under strategically located intersections, where water is stored constantly even today.