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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 #592 - Summary, and parameter estimates with source IDs                                           
Listed in catalogs, this event is soley based on a single MWR report from the observer in Arlington, who reported a double shock at this time. 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
1923  14  10  48.10  121.80        Silverton  WA  IV  MM       
TAWA - 1175 WWC - 1866 - - RAS - 170 -

Underlying Source Material
Source ID Publication Pub Date Pub Details
795  Reid, unpub., Scrapbook and Cardfile, on microfilm at USGS in Menlo Park     
Transcription: Arlington 48 degrees 10' N; 122 degrees 10' W PST 4:10 pm, 5:45 pm 14 July, 1923 GMT 0h 10m, 1h 45m 15 July, 1923 IV -MWR Evidently related to shocks 1/2 hour earlier. Perhaps the same.
 
Source ID Publication Pub Date Pub Details
1175  Townley, S. D. and M. W. Allen, 1939, Descriptive Catalog of Earthquakes of the Pacific Coast of the United States 1769-1928, Chap. III Earthquakes in Washington, 1883-1928, BSSA, V. 29, No. 1, pp. 259-268  1939   
Transcription: 1923 July 14. 3:30 p.m., 4:10 pm., 5:45 p.m. IV. Snohomish Co. The first shock reported from Silverton as double, IV, duration thirty seconds; may correspond to first shock felt at Arlington, 4:10 p.m., also reported as double, IV, duration several seconds; felt by many. The shock at 5 :45 p.m. was reported at Arlington only.-MWR, 51, 378.
 
Source ID Publication Pub Date Pub Details
2313  Monthly Weather Review  1923  V. 51, p. 378 
Transcription: Date: July 15, 1923
Time (Greenwich Civil): 0:10
Location: Arlington, Washington
Latitude (deg., min.): 48 10
Longitude (deg.,min.): 122 10
RF Intensity: 4
Number of Shocks: 2
Duration (sec.): Several
Sounds: Rumbling
Remarks: Felt by many
Observer: N. Field
 
Source ID Publication Pub Date Pub Details
1866  Woodward Clyde Consultants, unpublished  1981  Woodward-Clyde Consultants (1981), Historical Catalog (1841-1980) for the Pacific Northwest Region, unpublished catalog prepared for the Washington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: 192307150010000 48100-121800W IV R 4 01
 
Source ID Publication Pub Date Pub Details
170  Rasmussen, Norman, 1967, Washington state earthquakes 1840 through 1965, BSSA V. 57, No. 3, pp. 463-476  1967   
Transcription: 170 1923 July 14-15 See Remarks Silverton-Arlington IV 4 Three shocks, all IV; 23:30,00:10,01:45
 


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