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Cascadia Historic Earthquake Catalog, 1793-1929
Covering Washington, Oregon and Southern British Columbia
Provided by: The Pacific Northwest Seismic Network
About the Cascadia Historic Earthquake Catalog       One-line catalog format

1793-1849 .... 1850s .... 1860s .... 1870s .... 1880s .... 1890s .... 1900s .... 1910s .... 1920s .... 1930s (not complete) .... Other Cascadia Catalogs

  
Individual Event Report
Event #551 - Summary, and parameter estimates with source IDs                                           
All of the catalog entries are based on the report of one weather observer at Cascadia, Oregon of a RF Intensity V earthquake "felt by nearly all, over an area six by twelve miles". No newspapers have been researched.
TIME LOCATION MAGNITUDE MAX. INTENSITY FELT AREA
YR MO DAY HR MIN AM/PM Time
Type		 LAT(N) LON(W) DEP
(km)		 MAG Mag
Type		 Felt
Plc.		 Felt
St.		 Inten-
sity		 Int.
Type		 Felt
Area		 Felt
Area
Int.		 Felt
Area
Units
1921  2  25  12    A  P  44.40  122.40        Cascadia  OR  V  RF       
TA-OR - 542 USEQS - 959 - - MWR - 2276 -

Underlying Source Material
Source ID Publication Pub Date Pub Details
542  Townley, S.D. and M.W. Allen, 1939, Descriptive Catalog of earthquakes of the Pacific Coast of the United States 1769 to 1928, Chapter II, Earthquakes in Oregon--1846-1928, BSSA, V. 29, No. 1, pp. 253-258.  1939   
Transcription: 1921 February 25. 12 a.m. V. Cascadia. Felt by nearly all, over an area six by twelve miles; intensity as given by observer.-MWR, 49, 110.
 
Source ID Publication Pub Date Pub Details
959  U. S. Dept. of Commerce, 1973, Earthquake History of the United States, V. 41-1, revised ed., pp. 89-96  1973   
Transcription: 1921 Feb, 25 12:00 Cascadia, Oreg 44.4 122.4 - V 3-53
 
Source ID Publication Pub Date Pub Details
634  Reid, unpub., Scrapbook and Cardfile, on microfilm at USGS in Menlo Park     
Transcription: Cascadia 44 degrees 20' N; 122 degrees 30' W PST 0h 0m 25 Feb, 1921 GMT 8h 0m V; MWR
 
Source ID Publication Pub Date Pub Details
1848  Woodward Clyde Consultants, unpublished  1981  Woodward-Clyde Consultants (1981), Historical Catalog (1841-1980) for the Pacific Northwest Region, unpublished catalog prepared for the Washington Public Power Supply System. Copy provided to UW in 1993. 
Transcription: 192102252000000 44400-122400 V NO 5 01
 
Source ID Publication Pub Date Pub Details
1018  U. S. Dept. of Commerce, 1973, Earthquake History of the United States, V. 41-1, revised ed., pp. 89-96  1973   
Transcription: 1921. February 25. Cascadia, Oreg. Felt by nearly all over an area of 6 by 12 miles.
 
Source ID Publication Pub Date Pub Details
2276  Monthly Weather Review  1921  V. 49, p. 110 
Transcription: Date: February 25, 1921
Time (Greenwich Civil): 8:00
Location: Cascadia, Oregon
Latitude (deg., min.): 44 20
Longitude (deg.,min.): 122 30
RF Intensity: 5
Number of Shocks: 1
Duration (sec.):
Sounds: Loud
Remarks:Felt by nearly everyone over area 6 by 12 miles
Observer: G. M. Geisendorfer
 
Source ID Publication Pub Date Pub Details
397  Byerly, Perry, 1952, Pacific Coast Earthquakes, Condon Lecture, pp. 33-38  1952  U.W. Library, N979 B991p, Special Collections) 
Transcription: 1921, February 25 Cascadia. Felt by nearly all, over an area of six by twelve miles.
 
Source ID Publication Pub Date Pub Details
1361  Berg and Baker, 1963, Oregon Earthquakes, 1841 through 1958, BSSA, V. 53, No. 1, pp. 95-108  1963   
Transcription: 1921 Feb 25 20:00:-- Feb 25 12:00 am (PST) Cascadia V* 10
 


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