There are many theories around catastrophism from ECDO to crustal displacement. The science is anything but settled as there has been no event in recorded human history… thus it all remains a catastrophism theory until it can be observed.
This is a Grokipedia-style breakdown of The Ethical Skeptic's ECDO theory of cataclysmic change on Earth.
A quick tour through four recent studies tracking the slowdown of Chandler and annual wobbles plus a consistent push of the rotation pole toward 75°W. These findings line up with the kind of rotational changes TPWSim readers simulate all the time.
Geomagnetic excursions arise from the system's own metastable attractor rather than external catastrophes.
Another nail in the gradualism ethos. If humans have been capable of civilization for several 100 thousand years, then the catastrophism cycle gains a lot of credibility. Otherwise, we’d all be living in another star system by now.