Summary
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.
  Anchorage Adak  | |
| UTC time | 2014-06-23 20:53:09 |
|---|---|
| ISC event | 604760173 |
| USGS-ANSS | ComCat |
| Local date | 23 June 2014 |
| Local time | 11:53 (HDT) (UTC-9) |
| Magnitude | 7.9 Mw[1] |
| Depth | 107.5 kilometers (66.8 mi) |
| Epicenter | 51°50′56″N 178°44′06″E / 51.849°N 178.735°E |
| Type | Oblique-slip |
| Areas affected | Alaska, United States |
| Max. intensity | MMI VIII (Severe)[1] |
| Tsunami | 17 cm (0.56 ft) |
| Aftershocks | 6.0 Mw June 23 at 21:11 UTC [2] |
Earthquake edit
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 edit
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 edit
References edit
- ^ a b USGS. "M7.9 - 19km SE of Little Sitkin Island, Alaska". United States Geological Survey.
- ^ USGS. "M6.0 - 6km WNW of Little Sitkin Island, Alaska". United States Geological Survey.
- ^ "Major earthquake hits off Alaska's Aleutian Islands". Reuters. 24 June 2014. Retrieved 7 August 2021.
- ^ "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.
- ^ "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.
- ^ "TSUNAMI BULLETIN NUMBER 002 PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS". Pacific Tsunami Warning Center. US National Weather Service. Retrieved 24 June 2014.
- ^ "Tsunami Event: ALEUTIAN ISLANDS, ALASKA". NGDC.
- ^ "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
- Ye, L.; Lay, T.; Kanamori, H. (2014), "The 23 June 2014 Mw 7.9 Rat Islands archipelago, Alaska, intermediate depth earthquake" (PDF), Geophysical Research Letters, 11 (18): 6389–6395, Bibcode:2014GeoRL..41.6389Y, doi:10.1002/2014GL061153
External links edit
- The International Seismological Centre has a bibliography and/or authoritative data for this event.
- M7.9 Rat Islands Earthquake of June 23, 2014 Alaska Earthquake Center (archived)