Earthquakes near Tonga trench

Illustration of the seafloor off Tonga and Fiji to show locations of earthquake epicenters.

Detailed Description

Location of the 2009 epicenter and that of a similar earthquake in 1917 (white circles) in relation to the bend in the Tonga trench (yellow line). Large open arrow shows direction and speed (237 mm/yr) of relative convergence between the Pacific plate and the overriding plate. Islands labeled “Samoa” include Samoa and American Samoa. Dots are epicenters of previous earthquakes; larger dots indicate earthquakes of greater magnitude. Red triangles, volcanoes. For detailed legend, visit “This Dynamic Planet,” and click the map to go to the interactive map. See also, “This Dynamic Planet: World Map of Volcanoes, Earthquakes, Impact Craters, and Plate Tectonics,” USGS Geologic Investigations Map I-2800.

Details

Image Dimensions: 800 x 610

Location Taken: US

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