Extension into Seattle and Vancouver

This earthquake was at the last strike-slip section before the classic Cascadia subduction zone. But these things never end where the map says they do. There's that whole 3d thing!  The stress disturbance may have activated these two little quakes. It leads one to believe that an M7 propagating down will produce serious PGV. This would hit both major cities. As usual the odds are only a shade above something else happening.