Magnitude 6.2 – 100km NNE of Chignik Lake, Alaska – April 2, 2016

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USGS Earthquake Report
2016-04-02 05:50:00 (UTC)
Magnitude 6.2
100km (62mi) NNE of Chignik Lake, Alaska
Location: 57.026 °N  -157.897 °W
depth=17.9 km (11.1 mi)

Alaska

Seismotectonics of Alaska –USGS
“The Aleutian arc extends approximately 3,000 km from the Gulf of Alaska in the east to the Kamchatka Peninsula in the west. It marks the region where the Pacific plate subducts into the mantle beneath the North America plate. This subduction is responsible for the generation of the Aleutian Islands and the deep offshore Aleutian Trench.
Most of the seismicity along the Aleutian arc results from thrust faulting that occurs along the interface between the Pacific and North America plates, extending from near the base of the trench to depths of 40 to 60 km. Slip along this interface is responsible for generating devastating earthquakes. Deformation also occurs within the subducting slab in the form of intermediate-depth earthquakes that can reach depths of 250 km. Normal faulting events occur in the outer rise region of the Aleutian arc resulting from the bending of the oceanic Pacific plate as it enters the Aleutian trench. Additionally, deformation of the overriding North America plate generates shallow crustal earthquakes.”

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