Boxing Day Tsunami Flashcards
The sundar trench marks the line where the __________ plate is being subducted beneath the _____ plate. This is a ___________ plate boundary.
Australian Burma
Caused by the _______ _______ earthquake which measured . on the Richter scale.
Sumatra andaman 9.3
As the Australian plate was _________ beneath the Burma plate they became stuck, causing pressure to become stuck causing pressure to build up and when this pressure is ________ the plates jolt past each other.
Subducted released
A __-__ meter slip occurred along ____km of fault line in a phase over 3-4 minutes.
15-20 1600km
The epicentre was ___km off the western coast of Sumatra.
160km
The focus of the quake was __km below sea level
30km
As the plates jolt this displaces a large column of water ___________.
Vertically
In the open ocean where the water is very deep the waves travel at high speeds of ___ to ____km/h. They have a long wavelength of about ___km and a small amplitude of about _ meter.
500 to 1000 km/h 200km 1 meter
Closer to land the water gets shallower and friction from the sea bed causes the waves to get compressed (squashed together) and their energy becomes more ____________.
Concentrated
The waves slow down to less than __km/h, their wavelength decreases to less than __km and in the case of the Boxing Day tsunami the height increased up to __meters.
80km/h 20km 30m
Just before the tsunami reaches the coast the water _________ down the shore. This is called ____ ____.
Withdraws draw back
The wave then strikes the land with great force and in the case if the Boxing Day tsunami travelled up to ___m inland in some areas.
300m
Elephants in ____ national park refused to leave the park to provide elephant rides, suggesting that this strange behaviour was because they could sense the tsunami was coming.
Yala
The effects of the tsunami were so bad because there was no _____ _______ system.
Early warning
___,___ people killed or still missing.
230,000
As many as _\ _ of the dead were children.
1/3
____ foreign tourists died.
9000