Strong and shallow magnitude 6.3 earthquake struck Revilla Gigedo Island region at 12:32:00 UTC 227 km (141 miles) NE of Socorro Island, 333 km (206 miles) SSE of Cabo San Lucas, Baja Calif. Sur, 419 km (260 miles) W of Puerto Vallarta, Jalisco, Mexic0 (19.891°N, 109.216°W) according to USGS, at depth of 5 km (3.1 miles). EMSC registered 5.6 magnitude at depth of 30km.
The Revillagigedo Islands or Revillagigedo Archipelago are a group of four volcanic islands in the Pacific Ocean, known for their unique ecosystem. They have been part of Manzanillo municipality of the Mexican state of Colima since 1861, but are nevertheless under Mexican federal jurisdiction, and lie 386 km southwest of Cabo San Lucas, the southern tip of Baja California peninsula, and between 720 and 970 km west of Manzanillo.
The Revillagigedo Islands are one of three Mexican island groups in the Pacific Ocean that are not on the continental shelf; the others are Guadalupe Island and Rocas Alijos.
There were no tsunami alert issued.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 1232Z 01 NOV 2011
COORDINATES - 20.0 NORTH 109.2 WEST
DEPTH - 10 KM
LOCATION - REVILLA GIGEDO ISLANDS REGION
MAGNITUDE - 6.5
NO DESTRUCTIVE WIDESPREAD TSUNAMI THREAT EXISTS BASED ON
HISTORICAL EARTHQUAKE AND TSUNAMI DATA.
HOWEVER - EARTHQUAKES OF THIS SIZE SOMETIMES GENERATE LOCAL
TSUNAMIS THAT CAN BE DESTRUCTIVE ALONG COASTS LOCATED WITHIN
A HUNDRED KILOMETERS OF THE EARTHQUAKE EPICENTER. AUTHORITIES
IN THE REGION OF THE EPICENTER SHOULD BE AWARE OF THIS
POSSIBILITY AND TAKE APPROPRIATE ACTION.