Timeline of Homeland Security Events and Milestones


Soda Springs, ID Sequence Earthquakes

(Credit: USGS)

September 2, 2017: following a magnitude 5.3 earthquake east of Soda Springs, Idaho was a sustained and highly active sequence of aftershocks.

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South Napa, CA Earthquake

(Credit: Erol Kalkan/ US Geological Survey)

August 24, 2014: A magnitude 6.0 earthquake hit in South Napa, California. It was the largest earthquake to hit the San Francisco Bay Area in 25 years.

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Mineral, VA Earthquake

(Credit: USNPS)

August 23, 2011: A magnitude 5.8 earthquake struck near Mineral, Virginia. It was the largest earthquake in the eastern U.S. since 1944.


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Loma Prieta Earthquake

eventOctober 17, 1989: A magnitude 6.9 earthquake occurred northeast of Santa Cruz, CA, approximately 60 miles from San Francisco. It was the largest earthquake to occur on the San Andreas fault since the great San Francisco earthquake in April 1906.

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Great Alaska Earthquake

(Credit: U.S. Army)

March 27, 1964: A magnitude 9.2 earthquake struck in the Prince William Sound region of Alaska. It lasted for approximately 4.5 minutes, and is the most powerful earthquake recorded in U.S. history.

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San Francisco Earthquake

(Credit: California Historical Society)

April 18, 1906: A magnitude of 7.9 struck San Francisco, CA. Violent shocks lasted approximately 40-60 seconds and was felt from southern Oregon to the south of Los Angeles and inland as far as Central Nevada.

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Hayward Fault Earthquake

(Credit: U.S. Geological Survey)

October 12, 1868: A magnitude of 6.8 struck the region of San Francisco Bay. It lasted for more than 40 seconds and is considered one of the most destructive earthquakes in California’s history.

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Great Fort Tejon Earthquake

(Credit: U.S. Geological Survey)

January 9, 1857: A magnitude 7.9 earthquake struck on the San Andreas Fault from near Parkfield to approximately 300 km away near Wrightwood.

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New Madrid, Missouri Earthquakes

(Credit: USGS)

December 15, 1811: The 1811-1812 New Madrid Sequence consisted of three large earthquakes that spanned from December 15, 1811 to February 7, 1812, followed by hundreds of aftershocks felt throughout the next year.

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