Tg of SO2 into the stratosphere and disturbed flights over this area for a short period following the eruptions. Earthquakes The 7.9 Mw Aleutian Islands earthquake occurred in June 2014 at an intermediate depth of 107 km. The quake was caused by oblique normal faulting along the Aleutian Trench, a convergent boundary where the Pacific plate is subducting underneath the North American plate at around 59 mm/year. See also List of earthquakes in Alaska References External links Mountains of Aleutians East Borough, Alaska Mountains of Kenai Peninsula Borough, Alaska Mountains of Kodiak Island Borough, Alaska Mountains of Lake and Peninsula Borough, Alaska Volcanic arcs Mountains of Alaska Mountain ranges of Alaska