This is mentioned, in passing, in "The Swamp Fights Back: The Third Fifty-six Days After Babylon the Great City Fell" (Trump Card series Book 3) [7 July 2017]
Seismic activity has been on the rise. The alignment of the Moon and Sun creates a gravitational pull which many dismiss, but which has, in the past, been shown to be the "straw that breaks the camel's back".
Such an event could become the defining issue of the Trump Administration.
How would Donald JohnTrump respond to a magnitude 8 or higher earthquake that endangers a third of the American population? Then, after that, how would the world react? Jihadists might see it as an opening.
There are many events unfolding -- the Denizens of the Swamp are pushing for POTUS Pence and an ultra-Right-wing government ... some are foolish enough to believe they can remove Trump, and then deal with Mike Pence. But, the backlash would be nasty.