Fig. 10: Model summary.
From: Fast and slow intraplate ruptures during the 19 October 2020 magnitude 7.6 Shumagin earthquake
a Schematic map and (b) vertical cross-section of the Shumagin Segment region indicating geometry of the preferred model with three faults that ruptured in the 19 October 2020 MW 7.6 event (black star indicates the hypocenter): F1 has fast strike-slip rupture within the underthrust Pacific plate (yellow zone); F2 has fast oblique-normal faulting rupture in the overthrusting North America plate (orange zone); F3 has slow thrust faulting rupture on a fault in the upper plate (green zone). The shallow edges of the fault models are indicated by thick lines. The sequence ruptured seaward of the 22 July 2020 MW 7.8 interplate thrust event (pink region with ≥0.5 m slip6; red star indicates the hypocenter). Megathrust coupling variations are indicated, along with aftershock zones of the 1938 and 1946 megathrust events (gray patches), and ≥0.5 m slip zone of the 2021 Chignik megathrust event16 (magenta outline).
