2014_Aleutian_Islands_earthquake

2014 Aleutian Islands earthquake

2014 Aleutian Islands earthquake

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The 2014 Aleutian Islands earthquake occurred on 23 June at 11:53 HDT (UTC-9) with a moment magnitude of 7.9 and a maximum Mercalli intensity of VIII (Severe). The shock occurred in the Aleutian Islands – part of the US state of Alaska – 19 miles (31 km) southeast of Little Sitkin Island.

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Earthquake

See also: Alaska-Aleutian megathrust

The earthquake was initially reported as 8.0 Mw before it was downgraded to 7.9.[3] The rupture was on a normal fault, at ~107 km depth. Based on the geometry of the slab, and the relative movement of the tectonic plates, the slip vector is likely to have been oblique down-dip towards the ESE. The fault plane appears to be oblique, striking NW-SE and cutting steeply into the subducting slab.

Tsunami

A tsunami warning was issued,[4] but was soon downgraded to a tsunami advisory for much of the Aleutian Islands;[5] however, the hypocenter was too deep to generate a tsunami that would affect the Pacific basin.[6] A small non-destructive tsunami was generated, with heights of 17 cm on Amchitka.[7][8]

See also

References

  1. [1]
    USGS. "M7.9 - 19km SE of Little Sitkin Island, Alaska". United States Geological Survey.
  2. [2]
    USGS. "M6.0 - 6km WNW of Little Sitkin Island, Alaska". United States Geological Survey.
  3. [3]
    "Major earthquake hits off Alaska's Aleutian Islands". Reuters. 24 June 2014. Retrieved 7 August 2021.
  4. [4]
    "TSUNAMI MESSAGE NUMBER 1 NWS NATIONAL TSUNAMI WARNING CENTER PALMER AK". tsunami.gov. US National Weather Service. Archived from the original on 1 July 2014. Retrieved 24 June 2014.
  5. [5]
    "TSUNAMI MESSAGE NUMBER 4 NWS NATIONAL TSUNAMI WARNING CENTER PALMER AK". tsunami.gov. US National Weather Service. Archived from the original on 2014-06-26. Retrieved 24 June 2014.
  6. [6]
    "TSUNAMI BULLETIN NUMBER 002 PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS". Pacific Tsunami Warning Center. US National Weather Service. Retrieved 24 June 2014.
  7. [7]
    "Tsunami Event: ALEUTIAN ISLANDS, ALASKA". NGDC.
  8. [8]
    "TSUNAMI MESSAGE NUMBER 5 NWS NATIONAL TSUNAMI WARNING CENTER PALMER AK". tsunami.gov. National Weather Service. 23 June 2014. Archived from the original on 1 July 2014. Retrieved 24 June 2014.

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