Figure 6. Large stress increases (red colors) are calculated in the lightly populated Central Range, but also to the north and south of the rupture, which are more densely populated regions. Central Taiwan is calculated to fall under a stress shadow (blue colors), potentially reducing seismic hazard. The calculation uses Coulomb 3.4 (Toda et al., 2011) and the USGS “finite fault” source model. The receiver faults are nodal planes of background and aftershock focal mechanisms. Fault friction is assumed to be 0.4, and the most positive stress change on the two nodal planes of each mechanism is used, so the map is “red biased.” This means that the map is not an equal distribution of red and blue, but contains more red.  Thus, if a region is blue, both nodal planes are calculated to have been brought further from failure (Toda and Stein, 2024a). Credit: Stein et al., 2024, CC BY-NC-ND 4.0