2021 M8.2 Chignik Earthquake

Aftershock zone estimates constrain the size of the M8.2 rupture to about 125 miles by 62 miles (200 km by 100 km). This earthquake displayed a thrust fault focal mechanism typical of an earthquake along the Alaska-Aleutian subduction zone interface. Preliminary finite fault inversions indicate that the maximum slip along the surface of the fault was between 2.5 m and 3 m.

This is an ongoing sequence, and these pages will be updated as the event unfolds.