Great earthquakes in the 20th century along the Aleutian Arc

Great earthquakes in the 20th century. Inset numbers over the 3 by 12 grid indicate subfaults with large slip in meters from the updated 1957 rupture model with red and blue tones for shallow and deeper megathrust rupture, respectively. Red solid and dashed lines indicate relocated aftershock zones of the 1957 Aleutian Islands earthquake, the 1946 Aleutian Islands tsunami earthquake, and the 1965 Rat Islands earthquake. Arrows and labels indicate Pacific plate convergence direction and rate relative to a fixed North American/Bering Sea plate from the MORVEL model. The approximate extent of the proposed Unalaska gap in the shallow megathrust is indicated in gray. The inset map shows the Hawaiian Islands in relation to the Aleutian tsunami source region. b Schematic cross section. The near-trench, central, and down-dip regions across the plate boundary are classified as Domains A, B, and C, which are represented by the three along-strike rows of subfaults to account for depth-dependent rupture and tsunamigenic properties. From the study A 700-year rupture sequence of great eastern Aleutian earthquakes from tsunami modeling of stratigraphic records.