USGS / earthquake map for the period October 2011 12.06
A series of earthquakes was recorded along the Puerto Rico trench, near the Virgin Islands and Puerto Rico, in the past week.
30 earthquakes in the range of 2.7 to 3.5, have been recorded in the region, according to the United States Geological Survey ( USGS ). Most aftershocks occurred north of the Virgin Islands and the north-west of Puerto Rico.
None of the islands has no active volcanoes in the region over the last 100 years there have been more than 7 earthquake on the Richter scale (see below).
Puerto Rico, United States Virgin Islands, British Virgin Islands, and the Dominican Republic does not have active volcanoes, but they are at risk from earthquakes and tsunamis. Puerto Rico Trench is capable of producing an earthquake magnitude of about 8.0.
An earthquake measuring 4.6 on the Richter scale was felt throughout Puerto Rico and the Virgin Islands in the afternoon of September 27, 2011. The epicenter was located 5 km (3 miles) north-west at a depth of 41.9km. A magnitude 4.7 earthquake struck the region of Puerto Rico this year, on May 21. It was recorded 118 miles east of Higuey, in accordance with EMSC . The islands lie along the Puerto Rico trench, oceanic trench located on the boundary between the Caribbean Sea and the Atlantic Ocean. The trench is associated with a complex transition between the subduction zone to the south along the arc of the Lesser Antilles and the zone of transformation boundary that extends west between Cuba and Hispaniola through the Cayman Trench to the coast of Central America.
Island of Puerto Rico is located immediately south of the fault zone. The basin is 800 kilometers (497 miles) long and has a maximum depth of 8,000 meters (26,247 feet), it is the deepest point in the Atlantic Ocean.
View of the sea bottom of the Atlantic Ocean and the Caribbean Sea. Lesser Antilles are on the lower left side, Florida is in the top right corner. Purple stain — Puerto Rico Trench.
Research studies at the National Oceanic and Atmospheric Administration (NOAA) have shown that earthquakes occurring in this fault zone mozhgut generate significant tsunami.