Is that the one where the earthquake was followed by a nasty flood because the earthquake destroyed a huge dam?
I can't remember, in 1974, I was 5-years-old, but I think I saw it on reruns.
I remember one thing about it pretty clearly due to the extra sound effects that were promoted as feeling the earthquake, an intense low bass rumbling. Pretty cool custom Blazer. Other than that, I think there were a lot of fires. A little on the cheesy side but that’s the norm for disaster movies.