A strong magnitude-6.3 earthquake struck under the Pacific Ocean early Tuesday off Mexico's coast, but US experts said there was no major tsunami threat and no casualties or damage were reported.
The quake occurred at 1232 GMT some 333km southeast of Mexico's Baja California beach resort of Cabo San Lucas, according to experts from the US Geological Survey.
While the temblor was at a shallow depth of 5km, the Pacific Tsunami Warning Centre reported there was no widespread destructive tsunami threat.
The USGS initially measured the quake at a stronger magnitude of 6.5 but later revised the reading.
The earthquake struck in the region of the Revilla Gigedo archipelago, small volcanic islands off the Baja California peninsula that are sometimes referred to as Mexico's "little Galapagos" because of several endemic plant and animal species. The waters are popular with divers and snorkellers.
The largest island, Socorro, has a Mexican naval base and is home to a few hundred people. The quake struck some 227km from Socorro, and there were no immediate reports of damage on the island.
Much of Mexico lies on the Pacific Ring of Fire, a horseshoe shaped region from the southern tip of South America up to Alaska and down through Japan to New Zealand. Most of the world's earthquakes and volcanic eruptions occur along the ring.
A historic 8.1-magnitude quake struck off Mexico's Pacific coast in 1985, and while it was centreed some 350km from Mexico City, it devastated the capital, killing at least 10,000 people.
Tuesday's temblor was about 1,050km west of Mexico City.
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