Individual Event Report
| Event #581 - Summary, and parameter estimates with source IDs |
| Off Cape Mendocino. 'Earthquake History of the US' says: "...strongly shook the Cape Mendocino region and toppled many chimneys in the area. This earthquake was probably associated with the Mendocino Fracture Zone." Townley and Allen say: "A severe shock was felt in northern California and southern Oregon ... The origin was at sea off Cape Mendocino." The MWR lists no reports from Oregon weather observers on this date. No newspaper accounts 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 |
1 |
22 |
1 |
4 |
A |
P |
40.50 |
124.50 |
|
7.20 |
G-R |
off Cape Mendocino |
CA |
VII |
MM |
|
|
|
| TA-OR - 551 |
USEQS - 2537 |
- |
MISC - 2542 |
USEQS - 2537 |
- |
Underlying Source Material
| Source ID |
Publication |
Pub Date |
Pub Details |
| 2542 |
The San Andreas Fault System, California, Chapter 6: "Earthquake History, 1769-1989" by William L. Ellsworth, USGS Professional Paper 1515. 1990 |
1990 |
p. 169, 185 |
Transcription: January 22, 1923 (M=7.2)
The earthquake of January 22, 1923, strongly shook the Cape Mendocino region and toppled many chimneys in the area. This earthquake was probably associated with the Mendocino Fracture Zone.
From Table 6.1:
1923/1/22, 09:04 GMT, M=7.2, 40.5N, 124.5W, Cape Mendocino, MG-R=7.2, MS=7.3, MI=6.3,6.8 |
| |
| Source ID |
Publication |
Pub Date |
Pub Details |
| 551 |
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: 1923 January 22. 1:04 a.m. Southwestern Oregon. A severe shock was felt in northern California and southern Oregon on January 22, 1923. The origin was at sea off Cape Mendocino. For a full account see the California list. |
| |
| Source ID |
Publication |
Pub Date |
Pub Details |
| 2537 |
U. S. Dept. of Commerce, 1973, Earthquake History of the United States, V. 41-1, revised ed., pp. 137-189 |
1973 |
|
Transcription: 1923, January 22. Off Cape Mendocino. At Upper Matole, Petrolia, Dyerville, and Pepperwood, houses were damaged and chimneys were thrown down. Slight damage at Eureka; shock lasted 45 seconds. The shock was felt 200 miles from the epicenter, but was not noted at many places at less distances because of the time of day so the area of perceptibility is uncertain. Felt on a number of vessels at sea. Magnitude 7.3.
1923, Jan. 22, 01:04 PST, Off Cape Mendocino, 40.5 124.5, MM VII-VIII |
| |
| Source ID |
Publication |
Pub Date |
Pub Details |
| 643 |
Reid, unpub., Scrapbook and Cardfile, on microfilm at USGS in Menlo Park |
|
|
| Transcription: Southern Oregon 41 degrees N; 124.6 degrees W PST 1:04:18 am 22 Jan, 1923 Origin off the coast of N. California at position given. |
| |
| Source ID |
Publication |
Pub Date |
Pub Details |
| 406 |
Byerly, Perry, 1952, Pacific Coast Earthquakes, Condon Lecture, pp. 33-38 |
1952 |
U.W. Library, N979 B991p, Special Collections) |
| Transcription: 1923, January 22 Epicenter off Cape Mendocino. Felt in northern California and southern Oregon. |
| |
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