(Click to Enlarge)A map showing the effects of an 8.3-magnitude earthquake and its resultant tsunami
on Samoa and American Samoa.(Source: Google)
From ABC News (Australia):
Scientists say the tsunami that devastated the islands of Samoa, American Samoa and Tonga was the result of a shallow rupture in the earth's crust.
The earthquake, which was measured as high as 8.3 on the Richter scale, occurred 190 kilometres southwest of American Samoa.
Gary Gibson, a senior seismologist at Environmental Systems and Services in Melbourne, says the region experiences several magnitude 7 earthquakes each year, but a magnitude 8 is quite rare.
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