MEXICO CITY, Mexico (CNN) -- A moderate quake measuring 5.6 in magnitude struck southwestern Mexico near the resort city of Acapulco on Monday, according to the U.S. Geological Survey.
USGS measured the quake's epicenter in the state of Guerrero about 43 miles northeast of Acapulco.
Authorities in Acapulco evacuated hotels there, although there were no reports of damage, according to CNN affiliate TV Azteca.
CNN Producer Lonzo Cook, who is in the Mexican capital, said people there headed out into the streets after a vibration shook the building for about 30 to 40 seconds. There was no visible damage, he said.
"People in neighboring office buildings -- quite a majority of them wearing masks because of the swine flu outbreak -- were piling out into the streets," Cook said. "There were a few humorous people on the stairways saying, 'This is the apocalypse. First the swine flu, and now this.' " iReport.com: Send photos, video
However, most people were in "high spirits," Cook said.