Tibbetts, 20, vanished on July 18 after an evening run.
Hunter, who represents communities in San Diego and Riverside counties, was the second member of Congress to officially endorse Trump.
No casualties or major damage were immediately reported, but shaking sent people fleeing homes and businesses across the region and the Caribbean.
The youngest boy, who is 1 year old, was expected to be released from a hospital Tuesday, a sheriff's official in Arkansas said.
The device helped patients even if it did not fully relieve symptoms of depression, researchers found.