2014 Aleutian Islands earthquake

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 VI (Strong). The shock occurred in the Aleutian Islands – part of the US state of Alaska – 19 miles (31 km) southeast of Little Sitkin Island.

2014 Aleutian Islands earthquake
Anchorage
Adak
UTC time2014-06-23 20:53:09
ISC event604760173
USGS-ANSSComCat
Local date23 June 2014 (2014-06-23)
Local time11:53 (HDT) (UTC-9)
Magnitude7.9 Mw [1]
Depth107.5 kilometers (66.8 mi)
Epicenter51.80°N 178.76°W / 51.80; -178.76
TypeOblique-slip
Areas affectedAlaska, United States
Max. intensityVI (Strong) at Adak [2]
TsunamiYes
Aftershocks6.0 Mw June 23 at 21:11 UTC [3]

Earthquake
See also: Alaska-Aleutian megathrust

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.[7]

See also

References
  1. USGS. "M7.9 - 19km SE of Little Sitkin Island, Alaska". United States Geological Survey.
  2. AEC. "M7.9 Rat Islands Earthquake of June 23, 2014". Alaska Earthquake Center.
  3. USGS. "M6.0 - 6km WNW of Little Sitkin Island, Alaska". United States Geological Survey.
  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. "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. "TSUNAMI BULLETIN NUMBER 002 PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS". Pacific Tsunami Warning Center. US National Weather Service. Retrieved 24 June 2014.
  7. "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.

Sources

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