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Extinct undersea volcanoes squashed under Earth’s crust cause tsunami earthquakes, according to new research Posted: 27 Jun 2014 06:47 PM PDT New research has revealed the causes and warning signs of rare tsunami earthquakes, which may lead to improved detection measures. Tsunami earthquakes happen at relatively shallow depths in the ocean and are small in terms of their magnitude. However, they create very large tsunamis, with some earthquakes that only measure 5.6 on the Richter scale generating waves that reach up to ten metres when they hit the shore.  read more

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