Alaska earthquakes in 1940
22 earthquakes of magnitude 2.5 or more were located in Alaska in 1940. The largest: M7.0 24 km E of Attu Station, Alaska, Apr 16, 1940.
From the USGS catalog. Times are local to each quake.
Map
Where every quake of 1940 was located in Alaska. Select one for its page.
Every quake of 1940
Magnitude 2.5 and up, newest first.
- 6.3177 km S of Attu Station, Alaska · 25 km deep
- 5.913 km N of Fox River, Alaska · 35 km deep
- 6.0191 km WNW of Attu Station, Alaska · 15 km deep
- 5.8south of Alaska · 15 km deep
- 7.0203 km SSE of Unalaska, Alaska · 15 km deep
- 5.9109 km WNW of Adak, Alaska · 15 km deep
- 6.286 km ESE of Attu Station, Alaska · 15 km deep
- 5.8Rat Islands, Aleutian Islands, Alaska · 65 km deep
- 6.369 km S of Attu Station, Alaska · 25 km deep
- 6.2101 km SW of Adak, Alaska · 35 km deep
- 6.0151 km SSE of Attu Station, Alaska · 15 km deep
- 6.467 km S of Attu Station, Alaska · 25 km deep
- 6.380 km S of Attu Station, Alaska · 25 km deep
- 6.0175 km SSE of Attu Station, Alaska · 15 km deep
- 7.024 km E of Attu Station, Alaska · 30 km deep
- 7.080 km SSE of Attu Station, Alaska · 30 km deep
- 5.8Rat Islands, Aleutian Islands, Alaska · 35 km deep
- 6.6276 km WSW of Adak, Alaska · 50 km deep
- 6.1118 km ESE of Chignik, Alaska · 15 km deep
- 6.058 km SW of Sand Point, Alaska · 45 km deep
- 5.790 km W of Adak, Alaska · 15 km deep
- 6.6201 km SE of Attu Station, Alaska · 15 km deep
Month by month
Counted by UTC date, which is how the catalog files them.
| Month | Quakes | Largest | Where |
|---|---|---|---|
| January 1940 | 0 | ||
| February 1940 | 3 | 6.6 | 201 km SE of Attu Station, Alaska |
| March 1940 | 3 | 6.6 | 276 km WSW of Adak, Alaska |
| April 1940 | 3 | 7.0 | 24 km E of Attu Station, Alaska |
| May 1940 | 3 | 6.4 | 67 km S of Attu Station, Alaska |
| June 1940 | 2 | 6.3 | 69 km S of Attu Station, Alaska |
| July 1940 | 2 | 6.2 | 86 km ESE of Attu Station, Alaska |
| August 1940 | 3 | 7.0 | 203 km SSE of Unalaska, Alaska |
| September 1940 | 1 | 6.0 | 191 km WNW of Attu Station, Alaska |
| October 1940 | 1 | 5.9 | 13 km N of Fox River, Alaska |
| November 1940 | 1 | 6.3 | 177 km S of Attu Station, Alaska |
| December 1940 | 0 |
What this means
The catalog is only as complete as the instruments of the time. Worldwide coverage of magnitude 5 and up dates from the 1960s, and of 4.5 from the 1990s; earlier years hold the large quakes and the ones near a station, so a low count in an early year means fewer instruments, not a quiet earth.
By year
Every year the USGS catalog covers.
- 2020s2020202120222023202420252026
- 2010s2010201120122013201420152016201720182019
- 2000s2000200120022003200420052006200720082009
- 1990s1990199119921993199419951996199719981999
- 1980s1980198119821983198419851986198719881989
- 1970s1970197119721973197419751976197719781979
- 1960s1960196119621963196419651966196719681969
- 1950s1950195119521953195419551956195719581959
- 1940s1940194119421943194419451946194719481949
- 1930s1930193119321933193419351936193719381939
- 1920s1920192119221923192419251926192719281929
- 1910s1910191119121913191419151916191719181919
- 1900s1900190119021903190419051906190719081909
Nearby
Sources
Earthquakes, magnitudes, depths, shaking estimates and felt reports from the U.S. Geological Survey Earthquake Hazards Program, read from its live feeds and its catalog back to 1900. Tsunami messages from NOAA’s tsunami warning centers.