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OFFSHORE NORTHERN CALIFORNIA
Distances 74 km (46 miles) W (278°) from Petrolia, CA
77 km (48 miles) WSW (257°) from Ferndale, CA
87 km (54 miles) WSW (247°) from Humboldt Hill, CA
93 km (58 miles) WSW (244°) from Eureka, CA
376 km (234 miles) NW (322°) from San Francisco City Hall, CA
The Cape Mendocino Earthquake Sequence (also called the Petrolia, Ferndale or Lost Coast earthquake): April 25, 1992, 11:06 a.m. PDT, magnitude 7.1; April 26, 12:41 a.m. PDT, magnitude 6.6; 4:18 a.m. PDT, magnitude 6.7. The first large historic earthquake generally thought located along the Cascadia subduction zone megathrust, and the largest historic onshore earthquake of the century. The April 25 earthquake produced some of the strongest ground shaking ever recorded. It uplifted a 12-mile stretch of coastline near Cape Mendocino by one to four feet, killing intertidal communities of barnacles, sea urchins and algae. The motion of the sea floor produced a tsunami that reached coastal communities within minutes and reached a maximum height 1 1/2 feet at Crescent City. The mainshock and large aftershocks caused on the order of $60 million in damages and resulted in a federal disaster declaration.
The Mendocino Fault Earthquake: September 1, 1994, 8:15 a.m. PDT, magnitude 6.9. The largest earthquake ever recorded along the Mendocino fault. The earthquake was felt from south of San Francisco to Roseburg, Oregon but caused little damage due to its far offshore location. The widely felt magnitude 6.6 earthquake from the same region on February 18, 1995, is believed to have been triggered by the Mendocino fault earthquake.