1949 Olympia earthquake

The 1949 Olympia earthquake occurred on April 13 at 11:55:44 local time with a magnitude of 7.1[2] and a maximum Mercalli Intensity of VIII (Severe). The earthquake was triggered more than 50 kilometres (31 mi) deep.[2] The shock was located in the area between Olympia and Tacoma, and was felt throughout the state, as well as parts of Oregon, British Columbia, Idaho, and Montana. It is the largest recorded earthquake to occur in the Puget Sound region of Washington.

1949 Olympia earthquake

Olympia Seattle Tacoma
UTC time	1949-04-13 19:55:43
ISC event	896466
USGS-ANSS	ComCat
Local date	April 13, 1949 (1949-04-13)
Local time	11:55:44
Duration	~ 20 s [1]
Magnitude	7.1 Mw[2]
Depth	50 km (31 mi) [3]
Epicenter	47.0°N 122.53°W / 47.0; -122.53 [3]
Areas affected	Puget Sound region Washington United States
Total damage	$25 million [4]
Max. intensity	VIII (Severe) [4]
Peak acceleration	.25g [1]
Casualties	8 killed [4] At least 64 injured [5]

Eight people were killed, including young crossing guard Marvin Klegman who shielded a second-grader from falling bricks.[2] At least 64 people were injured, and the total damage is estimated at $25 million.

Damage

Damage in Olympia from the earthquake was estimated between $500,000 and $1 million by Governor Arthur B. Langlie.[6] Eight buildings on the State Capital campus were damaged by the earthquake, as well as the Old Capitol Building in downtown Olympia.[7] A 23-ton cradle on the east tower of the Tacoma Narrows Bridge fell 500 feet, injuring two men.The earthquake caused geysers to explode along the railroad track in the Tacoma tidal flats and in Puyallup. Chimneys throughout western Washington collapsed.[2]

See also

• List of earthquakes in 1949
• List of earthquakes in the United States
• List of earthquakes in Washington (state)
• 1965 Puget Sound earthquake

References

1. Baker, G. E.; Langston, C. A. (1987), "Source parameters of the 1949 magnitude 7.1 south Puget Sound, Washington, earthquake as determined from long-period body waves and strong ground motions", Bulletin of the Seismological Society of America, 77 (5): 1546
2. McNair-Huff, Rob & Natalie (2016). Washington Disasters. Rowman & Littlefield. pp. 129–134. ISBN 978-1-4930-1322-7.
3. ISC (2014), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 1.05, International Seismological Centre
4. Stover, C. W.; Coffman, J. L. (1993), Seismicity of the United States, 1568–1989 (Revised), U.S. Geological Survey Professional Paper 1527, United States Government Printing Office, pp. 380, 385, 386
5. "Earthquake damage in Pioneer Square, Seattle, April 13, 1949". Museum of History and Industry. Retrieved 16 November 2017.
6. "Olympia Damage Half Million, Says Langlie". The Seattle Daily Times. April 19, 1949. p. 7.
7. "Earthquake Listed as Major; 5 Dead; Damage in Millions". The Seattle Daily Times. April 13, 1949. p. 1.

Further reading

• Hodgson, J. H.; Storey, R. S. (1954), "Direction of faulting in some of the larger earthquakes of 1949", Bulletin of the Seismological Society of America, 44 (1): 57–83
• Ichinose, G. A.; Thio, H. K.; Somerville, P. G. (2006), "Moment Tensor and Rupture Model for the 1949 Olympia, Washington, Earthquake and Scaling Relations for Cascadia and Global Intraslab Earthquakes", Bulletin of the Seismological Society of America, 96 (3): 1029–1037, Bibcode:2006BuSSA..96.1029I, doi:10.1785/0120050132

External links

• Earthquake hits Puget Sound area on April 13, 1949 – HistoryLink
• The International Seismological Centre has a bibliography and/or authoritative data for this event.
• Earthquake Hazards – USGS