I acn't share specific details about the catacalysm due to rule 1. but I can share some general information about it.

Cataclysms are preventative measures taken by God when
1. Genetic Contamination and degradation
2. Moral contamination and degradation
3. Violation/intereference with free will
exceeds 90% of the population. A catacalysm is preventative action to preserve the very few remaining pure ones, otherwise humans will led themselves to extinction.

God does this via natural mechanisms. At macro scale the interrelationships between the earth, moon and sun powers all the catacalysms. As per current scenerio the catacalysm is likely to be based on geomagnetic field, solar activity and firmament. these will form various disasters such as volcanic eruptions, emp, radiation, pestilence, earthquake, temperature anomalies whatever. The only aim here is that no unworthy shall survive the catacalysm AND the seed population for next civilization is secured.

That's where the catch is. The unworthy, no matter how much they prepare, they won't survive.
They make bunkers, earthquakes and floods will destroy them.
They go to space, radiation and emp will kill them.
They make arks, they will drown and crash.
They try to escape far away, firmament will stop them.
Their actions are futile as long as there heart isn't in the right place.

the way to stop this catacalysm is known only to me. It has been acceleration since last century and will happen for sure if actions to reverse it are not taken.
if you wanna survive this, only way is to become worthy. No one not on his list won't survive.