I watched an old one the other night...... from 1974......Earthquake. (extract from Wiki - American disaster film that achieved huge box-office success, continuing the disaster film genre of the 1970s where recognizable all-star casts attempt to survive life or death situations. The plot concerns the struggle for survival after a catastrophic earthquake destroys most of the city of Los Angeles, California).
Ahhh...the good old days...when a film didn't always have a happy ending. In this one the main character dies.....then the movie just ends....yet the movie was still a huge success.