Map of ocean area with ocean floor topography. Cross sections below.

Figure 3: (Top) Map of the tectonic setting with the earthquake sequence. The magnitude-7.5 foreshock, magnitude-8.1 mainshock, and aftershocks are shown, with color indicating reported depth. (Bottom) Profiles A and B illustrate the depth distribution of seismicity; background highlights subduction of oceanic lithosphere. Seismicity in the outer rise may be a clue to the slip pattern in this otherwise enigmatic event. Colored contours represent depth of slab2.0 (Hayes, 2018). Map produced using tectoplot (Bradley, 2021).

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