map with colorful area in the middle

Here we calculate the stress transferred by the Sept. 19, 2022 magnitude-7.6 earthquake to the surrounding fault patches, using Coulomb 3.3 (Toda et al., 2011). The stress drops at the site of high slip (the ‘core’), and rises in the surrounding annulus (‘corona’), as explored in Toda and Stein (2022). Stress is also transferred to the southwest portion of the rupture surface of the 1985 Michoacán earthquake (Mendoza and Hartzell, 1989), which has already been the site of a magnitude-6.8 aftershock, consistent with these calculations.

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