Calculated Coulomb stress change (along optimally-oriented strike slip faults at 10 km depth with friction of 0.4) is shown at left. Seismicity rate change after the M 7.1 quake is shown at right, in which warm colors indicate rate increases (aftershocks), and turquoise colors indicate rate decreases. Rate decreases are difficult to detect in the weeks after the mainshock.

Calculated Coulomb stress change (along optimally-oriented strike slip faults at 10 km depth with friction of 0.4) is shown at left. Seismicity rate change after the M 7.1 quake is shown at right, in which warm colors indicate rate increases (aftershocks), and turquoise colors indicate rate decreases. Rate decreases are difficult to detect in the weeks after the mainshock.

Calculated Coulomb stress change (along optimally-oriented strike slip faults at 10 km depth with friction of 0.4) is shown at left. Seismicity rate change after the M 7.1 quake is shown at right, in which warm colors indicate rate increases (aftershocks), and turquoise colors indicate rate decreases. Rate decreases are difficult to detect in the weeks after the mainshock.