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Sumatra, or north-western ____________ is right on a plate boundary. The earth's surface is made up of lots of different tectonic plates and they are all moving around. The plate that has ____________ Indian Ocean on it is moving roughly north-east and colliding with Sumatra. And as ____________ collision takes ____________ ____________ Indian Ocean plate ____________ subducted ____________ Sumatra, and as that plate is subducted ____________ breaks up and that is what causes the earthquake. This earthquake been ____________ of the largest ever, one of ____________ great earthquakes. There has been a rupture along a fault about 1,000km ____________ and ____________ has generated a vertical displacement of about 10m. The displacement in the sea floor has generated this huge tsunami. Unlikely there will be ____________ tsunamis of the ____________ size. What normally happens when you get a very large ____________ is you get aftershocks that continue for many ____________ They are usually a bit smaller ____________ the main shock, although it is not ____________ that there could be another ____________ But there may be aftershocks and they may generate smaller tsunamis.
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