No casualties or major damage were immediately reported, but shaking sent people fleeing homes and businesses across the region and the Caribbean.
Three months after the Supreme Court overturned a law prohibiting states from legalizing sports betting, a few states have begun accepting wagers.
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.
The youngest boy, who is 1 year old, was expected to be released from a hospital Tuesday, a sheriff's official in Arkansas said.