Oceanic-Oceanic Plate Boundary
Oceanic-Oceanic Boundaries as well as Oceanic-Continental boundaries are convergent boundaries that subduct below the connecting plate depending on which one is more dense; but the difference between both is that we know that with oceanic-continental boundaries the oceanic lithosphere will be more dense, therefore sinking when it meets the continental crust. Since both lithospheres of an Oceanic-Oceanic boundary are the same, which ever is more dense will sink beneath the other. A great example of this type of boundary is located east of The Caribbean Plate. Due to less density of the North and South American Plates, the Atlantic Plate ( both North and South American Plate) is sub ducted beneath The Caribbean Plate, because of its density. As a result of pressure, friction and plate material melting in the mantle, it is common for earthquake to occur and for volcanic arcs to form.
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The Lesser Antilles
The Antilles is composed of two smaller group of islands; The Greater Antilles and The Lesser Antilles. The Greater Antilles includes the larger islands of Cuba, Jamaica,Puerto Rico, Hispaniola and The Cayman Islands. The Lesser Antilles include the northerly Leeward Islands ( start east of Puerto Rico and reach Southward to Dominica ), the southeasterly Windward Islands ( starting from Dominica and reaching southward to the north of Trinidad & Tobago ) and the Leeward Antilles ( just north of Venezuela ). The Lesser Antilles unlike the Greater Antilles were formed due to the Caribbean Plate and Atlantic Plates subduction Zone. The subduction zone is also responsible for much of the Volcanic and earthquake activity in that region.
The Antilles is composed of two smaller group of islands; The Greater Antilles and The Lesser Antilles. The Greater Antilles includes the larger islands of Cuba, Jamaica,Puerto Rico, Hispaniola and The Cayman Islands. The Lesser Antilles include the northerly Leeward Islands ( start east of Puerto Rico and reach Southward to Dominica ), the southeasterly Windward Islands ( starting from Dominica and reaching southward to the north of Trinidad & Tobago ) and the Leeward Antilles ( just north of Venezuela ). The Lesser Antilles unlike the Greater Antilles were formed due to the Caribbean Plate and Atlantic Plates subduction Zone. The subduction zone is also responsible for much of the Volcanic and earthquake activity in that region.
The earthquake that occurred in the Martinique region in the Windward Islands ( picture above ) was among some of the earthquakes in the Lesser Antilles with the highest magnitude on the Richter scale. The Depth was amongst the highest in that region at 156 kilometers ( 93.93 miles ); it was so strong that it was felt in Martinique,Dominica,Guadeloupe, Montserrat, Antigua, St. Kitts and Nevis, Anguilla, British Virgin Islands, U.S. Virgin Islands and Puerto Rico. As well as Earthquakes, Volcanic activity is also caused by the activity of the oceanic-oceaninc subduction zone. Soufriere hills volcano located in the island of Montserrat ( picture below ) is a stratovolcano that became active in 1995 and has continued to erupt ever since. The eruptions have made more than half of the island of Montserrat uninhabitable and all the evacuations have caused more than two thirds of the population to leave the island. The Volcano is currently monitored by the Montserrat Volcano Observatory.