Friday, March 11, 2011

Historic Tsunamis of the San Pedro Area

In light of the devastating 9.0 magnitude earthquake that just struck Japan and the resulting tsunami warnings issued for the California coast, I am republishing research I have done on two tsunamis (August 1868 and May 1960) that impacted the Port of Los Angeles:
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A Tsunami Strikes San Pedro and Wilmington, August 1868

‘A Most Startling and Remarkable Tidal Phenomenon’

On August 14, 1868 a tsunami struck the harbor area.  A tsunami is a series of large sea waves usually caused by a large earthquake beneath the sea floor or less frequently by an underwater landslide or volcanic eruption.

For the rest of the article, click on this link and go to page 4:

 http://www.lamaritimemuseum.org/Vol_3_No_3_Winter_2007.pdf


USS Wateree
Beached at Arica, Chile, after she was washed ashore by a tidal wave on 8/13/1868

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"Largest Earthquake in the World" Impacts Los Angeles Waterfront, May 1960

On May 22, 1960, a magnitude 9.5 earthquake struck south central Chile.  The United States Geological Survey calls this "the largest earthquake in the world."  In Chile, approximately 2,000 people were killed,  3000 injured, and another 2,000,000 were left homeless.


The Governor's Office of Emergency Services for California estimates that the waves generated by this massive earthquake caused about $500,000 to $1,000,000 worth of damage to the state, and notes that two people were killed.

Locally, the Los Angeles Times reported that boats and piers were smashed along San Pedro's waterfront, where a series of tidal currents surged back and forth surged through the port's narrow Cerritos Channel. Some 300 yachts and small boats were ripped from their slips, and early estimates were that 15-20 boats had sunk. The surge was estimated at up to 8-9 feet high in places at times. A strong current caused the port's Terminal Island ferry Islander to be swept off course by 300 yards, while "monumental traffic jams" occurred in both the Los Angeles and Long Beach harbor areas.

A Port of Los Angeles report states that the "Chilean earthquake and tsunami of May 1960 was the maximum event recorded in recent history to impact the Ports."

For more on this devastating earthquake, click on these links:

http://earthquake.usgs.gov/earthquakes/world/events/1960_05_22_articles.php
http://www.conservation.ca.gov/cgs/geologic_hazards/Tsunami/Pages/About_Tsunamis.aspx

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