The October 2, 2007 earthquake occurred on the convergent boundary between the subducting Pacific and the overriding North American crustal plates. This region, where the two plates are being forced directly into one another, is one of the world's most active seismic zones. Over one hundred earthquakes of magnitude seven or larger have occurred along this boundary in the past hundred years. With the exception of the Unalaska and Shumagin seismic gaps, all portions of this plate boundary have ruptured within the past hundred years. The current sequence of earthquakes is located within the so-called Shumagin seismic gap. According to the crust deformation measurements, no significant strain is being accumulated within the gap.