There are no known faults in the region of the 2015 swarm which occurred on the Bering Shelf southeast of the Pribilof Islands.

Moment tensor inversions for the largest events in the sequence indicate a normal faulting mechanism. Normal fault mechanisms are associated in regions of tensional stress, where a region is being pulled apart. This swarm occurred far from well documented tectonics and the source of this seismicity is still unknown.

Global Centroid Moment Tensors results are shown below.