At 5:12 am on April 18, 1906, a fracture formed some 10 km below the Earth's surface offshore of the Golden Gate. It propagated upward and outward, reaching the surface and extending north and south. To the south it broke along the San Francisco peninsula, climbed through the Santa Cruz Mountains, and stopped abruptly at San Juan Bautista. To the north it hugged the coast in Marin, Sonoma, and Mendocino counties, passed into the Pacific Ocean north of Pt. Arena, and came to halt on land in Humboldt County. Approximately one and one-half minutes after it began, the rupture stopped....

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