The link is about what orientations the faults were that the great quakes were on. They say that it was the NNE-SSW plane for the 8.6, but I am not at all convinced from the animation and I can't evaluate the finite fault inversion; the page says it fits the NNE one better. But, OK, if they say so; it is not shown and I probably don't know how to look at it anyway. They say very shallow; but I wonder if it could have ruptured from shallow to deep. If it is very shallow (few km) and did not rupture to deep, makes it even more difficult to be that large: has to have unusually large stress drop/slip and must be very long.

Chris

Craig Nicholson and the link and just looking at the animation makes it clear enough that multiple faults were activated.

The link says the 8.6 may be the largest intraplate quake ever (within interior of plate). I've been suggesting it could be the largest recorded strike-slip quake.

• quake info