\nThe June 24, 2011, M 7.2 Fox Islands (Aleutian Islands, Alaska) earthquake occurred as a result of normal faulting within the downgoing Pacific slab as it thrusts beneath the North America plate at the Aleutian Trench, in the subduction zone extending to the southwest from Alaska. At the location of the event, the Pacific plate converges with North America at a velocity of about 71 mm/yr in a northwest direction, subducting at the Aleutian Trench south of the June 24th earthquake. Though the June 24th earthquake is near this regional subduction thrust interface, its depth (currently estimated as 52 km, though moment tensors place the event deeper) and focal mechanism solution (indicating either very shallow or near-vertical normal faulting) both suggest that the earthquake occurred within the subducting plate, beyond the down-dip edge of the coupled zone between North America and the Pacific plates. Slip on a fault aligned with either nodal plane of the focal mechanism solution is consistent with this intraplate setting.\n
\n\nHistorically, the section of the Aleutian Arc in the vicinity of the June 24th earthquake is less active than other parts of this subduction zone, though it has hosted 11 events of M 6+ since the early 1970s, all shallower than the June 24th earthquake. Few instrumentally recorded earthquakes at the depth of the June 24th event have been as large as M 6, though two nearby events of M 7+ near the beginning of the 20th century were also thought to have occurred within the subducting Pacific slab. The shallow subduction zone up-dip of the June 24th earthquake ruptured in the M 8.6 central Aleutians earthquake of 1957, which spawned a large and damaging tsunami locally and also impacted the shores of Hawaii and California.\n
\n\nIncreased attention to this event is due to the fact that the recent M 9 Tohoku, Japan, earthquake was preceded two days earlier by a nearby M 7.3 foreshock. While both of those Japanese earthquakes occurred on the subduction thrust plate boundary between the Pacific and North America plates, the June 24th Fox Islands earthquake is likely to have occurred within the lithosphere of the downgoing Pacific slab, and thus any link to future events on the plate boundary itself is less clear.\n
\n\nStatistically, any large earthquake raises the probability that other events may occur nearby (typically within two fault lengths, or approximately 100 km in this case). While the probability of a larger earthquake occurring in the near future close to the June 24th event cannot be precisely evaluated, such probabilities are typically low. \n
\n\nHayes et al. (2016) Tectonic summaries of magnitude 7 and greater earthquakes from 2000 to 2015, USGS Open-File Report 2016-1192. (5.2 MB PDF)\n
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