1975 Near Islands earthquake

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1975 Near Islands earthquake
Relief map of USA Alaska.png
Bullseye1.png
UTC  time1975-02-02 08:43:42
ISC  event 731901
USGS-ANSS ComCat
Local dateFebruary 1, 1975 (1975-02-01)
Local time22:43:42
Magnitude7.6 Ms
Depth10 km (6.2 mi)
Epicenter 53°07′N173°30′E / 53.11°N 173.50°E / 53.11; 173.50
Areas affectedUnited States (Alaska)
Max. intensity IX (Violent)
Casualties15 injured

The 1975 Near Islands earthquake occurred at 08:43 UTC on February 2 off the coast of Attu Island, Alaska. The earthquake had a surface wave magnitude of 7.6 and a maximum Mercalli intensity of IX (Violent). It caused heavy damage on Shemya Island, injuring 15 residents. The runways of Shemya Air Force Base sustained cracks up to 16 inches (41 cm) wide, and crevices with as much as 54 feet (16.6 m) of displacement were observed on the island. [1] [2] [3]

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<span class="mw-page-title-main">Lists of earthquakes</span>

Earthquakes are caused by movements within the Earth's crust and uppermost mantle. They range from events too weak to be detectable except by sensitive instrumentation, to sudden and violent events lasting many minutes which have caused some of the greatest disasters in human history. Below, earthquakes are listed by period, region or country, year, magnitude, cost, fatalities and number of scientific studies.

<span class="mw-page-title-main">Mount Vsevidof</span> Volcano in Alaska, United States

Mount Vsevidof is a stratovolcano in the U.S. state of Alaska. Its summit is the highest point on Umnak Island, one of the eastern Aleutian Islands. Its symmetrical cone rises abruptly from its surroundings. The base of the volcano is around 10 km (6 mi) wide, steepening from about 15 degrees at 300 m (980 ft) altitude to around 30 degrees near the summit. Some glacial tongues have cut through narrow canyons up to 120 m (390 ft) deep, due to ice filling the crater and extending down the north and east flanks of the cone. Vsevidof's most recent eruption was caused by an earthquake on March 9, 1957. The eruption began March 11, and ended the next day.

The 1965 Rat Islands earthquake occurred at 05:01 UTC, on 4 February. It had a magnitude of 8.7 and triggered a tsunami of over 10 m on Shemya Island, but caused very little damage.

References

  1. ↑ "Historical Earthquakes: Near Islands". U.S. Geological Survey . Retrieved 1 November 2015.
  2. ↑ Simon, R.B.; Stover, C.W.; Person, W.J. (1977). Earthquakes in the United States, January–March 1975. U.S. Geological Survey. p. 17.
  3. ↑ "Quake Hits Aleutians" (PDF). The New York Times . February 3, 1975. p. 15.


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