paroxysmal

Pertaining to or marked by paroxysm; caused by paroxysms or convulsions of nature.

Specifically In geology: Relating to or produced by a violent convulsion of nature.

Catastrophic or relating to the catastrophic theory.

Of the nature of a paroxysm; characterized or accompanied by paroxysms

Of, pertaining to, causing or accompanied by paroxysms

accompanied by or of the nature of paroxysms