Immediately after the 12 May 2008 M 7.9 Wenchuan earthquake, we began calculating the static stress change on major faults surrounding the rupture zone (Parsons et al., 2008), and Toda et al. (2008) mapped out regional Coulomb stress changes (Fig. 1). The purpose was twofold: (1) to identify the most likely locations (stress increases) of dangerous aftershocks, and (2) to conduct a prospective test of stress mapping as a rapid‐response forecast tool. The occurrence of the 20 April 2013 M 6.6 Lushan earthquake in the Longmen fault zone near Ya’an was consistent with the prospective static...

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