Tsunami in Japan 2011, most expensive natural disaster ever, damage costing 16-25 trillion yen, The FOCUS is the point below the Earth’s surface where the earthquake begins, The magnitude of an earthquake can be measured using the Richter scale, Destructive boundary is when 2 plates move away from each other, At a constructive boundary the heavier oceanic plate is forced under the continental plate, The very centre of the earth is called the inner core, At the beginning of a Tsunami waves are fast and are only a few metres high, In the 2011 Tsunami in Japan 190,000 homes were left without clean water and electricity, Extinct volcanoes are expected not to erupt again, Active volcanoes have erupted recently and are expected to erupt again, Volcanoes normally occur at constructive and destructive plate boundaries, In a tsunami, as the waves reach the land, they slow down, but get much higher, When a volcano erupts magma escapes out of a vent in the volcano and flows out as lava, Tsunamis go at speeds of up to 600mph + travel thousands of miles, A SEISMOGRAPH shows the shockwaves during an earthquake.

S1 Geography Earth Forces

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