Oh, you are all my people!
I love a good disaster action movie and agree that the 70s and 90s were both peaks (Dante's Peaks, even) for the genre. The Towering Inferno, Poseidon Adventure and Earthquake are my favourites from the earlier decade and then Dante's Peak, Volcano, Deep Impact, Independence Day etc were amazing in the 90s.
Did anyone else do the Earthquake ride at Universal Studios, Florida in the 90s? We went on holiday when I was 11 in 1990 and I'm pretty sure this started my obsession - it wasn't just the start of the 90s which brought all the aforementioned films to screens but after the holiday, my dad bought Earthquake on VHS as a memento(!) and I watch it obsessively, which led my mum to introduce me to Poseidon etc.
Independence Day isn't just a stonkingly good film but also gives me warm memories of seeing it with a large group of schoolfriends and one of the boys holding my hand for the entire film - nothing more happened which really confused me at the time but I remember that warm glow of holding hands with a boy in the dark while watching Will Smith punch the living daylights out of an alien.
The Rock has done a great job to trying to revive the genre recently - San Andreas and Skyscraper are both amazing. Rampage worth a look too.
Oh, and Greenland with Gerard Butler is another more recent example of plot-hole filled brilliance.
More action than disaster but I do have a soft spot for The Peacemaker from the 90s. Geoge Clooney and Nicole Kidman trying to stop Goran Visnjic from detonating a nuclear warhead? Yes please!