On 19 March 1931, even before "Arizona" was put through post-modernization sea trials, she hosted President Herbert Hoover for a brief vacation in the Caribbean. The President visited Puerto Rico and the Virgin Islands. Returning on 29 March, "Arizona" conducted her sea trials at Rockland, Maine, and had another catapult fitted on the top of Turret III, before she was transferred to the West Coast in August with her sister "Pennsylvania". In February 1932, the ship participated in Grand Joint Exercise No. 4 in which carrier aircraft successfully attacked Pearl Harbor on Sunday morning, 7 February. After returning to the West Coast from Fleet Problem XIV in 1933, the ship was anchored in San Pedro when an earthquake struck nearby Long Beach, California, on 10 March. Sailors from the ship joined the relief efforts, providing food, treating the injured and providing security from looters.