Epicenter (movie, 2000)

Epicenter concerns brassy, beautiful Amanda Foster, a down-on-her-luck Los Angeles detective who's been assigned to protect a mobster-turned-State's-Witness, Nick Constantine, from the mob. On the night of the assignment, the city is rocked by a devastating earthquake, forcing Amanda and Nick to fight their way through the ravaged city streets while being pursued by ruthless assassins and corrupt cops.