In our last episode, our heroes were about to let go the big quake.
This is the geological model. Note the upper rock is pretty soft and crappy.
Now, for the show.
WHAM, BLAM KABLOOEY, BATMAN!
Look at the mess on the 15 m supershear! The rock is shattered. And this is where they get their 5 m/s. At that PGV, the rock itself turns to dust. Nothing can stand, and the whole Yuckky thing collapses. The most damage is on the hanging wall, and that's where you'll see the highest PGV.
This is not realistic for the site. To get supershear, you need highly stressed hard rock that has been ground smooth by previous earthquake activity. This will be apparent by a low b-value. For example, Haiti which goes every 300 years without a lot of small activity is such a situation. Shattered rock like Yuck would have a high b-value.
I believe the Hamilton fault is also primed for supershear. As shown in the plot, you can confirm earlier activity by drilling into the hanging wall. The rock should be shattered, with high fluid flow, and natural gas should be seeping out. You can examine the lake sediments and look for hanging wall damage in the sediments, and natural gas pockmarks.
GUESS WHAT? Hamilton has all that!
End of series