Poster of the Aleutian Islands, Alaska Earthquake of 23 June 2014 - Magnitude 7.9

Tectonic Summary

The June 23, 2014 20:53 UTC earthquake in the Aleutian Islands, Alaska, occurred as the result of oblique normal faulting at moderate depths. At the location of this event, the Pacific plate subducts northward beneath the North America plate at a rate of approximately 59 mm/yr. The mechanism, location, and depth of the June 23 event indicate that the earthquake likely occurred within the subducting Pacific plate, several kilometers beneath the slab interface. The locus of the June 23 event is a very seismically active region, with 26 events of M 7 or greater having occurred within 250 km since 1900. Notable events include an M 8.4 in 1906, M 8.7 in 1965, and an M 7.9 in 1996 . Unlike the June 23 event, many of these events occurred at shallower depths, likely along the plate boundary interface.

Earthquake Report


Thumbnail image of poster.


The posters may be downloaded for viewing or for printing on a color plotter. Adobe PDF (.pdf) format files are provided. Adobe Acrobat 6.0 or higher is required for viewing the PDF file on a computer monitor and for printing the PDF map graphic.

Attention MAC users: If you have problems viewing the pdf files, please download the pdf file and view it in the lastest verion of Adobe Acrobat.