Diagram showing occurrence and timeline of great earthquakes and rupture grid at the Aleutian Arc

Figure: a Great earthquakes in the 20^th century. Inset numbers over the 3 by 12 grid indicate subfaults with large slip in meters from the updated 1957 rupture model³ 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 earthquake⁴. Arrows and labels indicate Pacific plate convergence direction and rate relative to a fixed North American/Bering Sea plate from the MORVEL model¹. The approximate extent of the proposed Unalaska gap^2,30 in the shallow megathrust is indicated in gray. The inset map shows the Hawaiian Islands in relation to the Aleutian tsunami source region. Base maps generated from https://www.gebco.net/data_and_products/gridded_ bathymetry_data/. b Schematic cross section. The near-trench, central, and down-dip regions across the plate boundary are classified as Domains A, B, and C¹⁰, 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.