Tectonics - Boxing Day Tsunami Flashcards

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1
Q

date

A

26th december 2004

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2
Q

wave height

A

32 meters (some of highest ever recorded)

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3
Q

wave distance

A

2km inland

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4
Q

speed of onset

A

2 hours

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5
Q

seafloor vertical movement

A

3 metres upwards

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6
Q

richter scale

A

9 - megathrust

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7
Q

plate margin

A

convergent destructive
Indian plate (O) subducting under Sunda plate (C)

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8
Q

depth of water column displacement

A

5km

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9
Q

wave direction

A

split directions:
larger waves - sri lanka ands africa
smaller waves - thailand, more destructive as closer

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10
Q

floodwaters

A

coastal towns totally destroyed
flimsy wooden buildings on stilts

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11
Q

maldives

A

low lying coral islands rendered inhabitable

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12
Q

coastal mangrove forests

A

protected with dense root network buffer

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13
Q

coral reefs

A

corals of Indian Ocean under stress from El Nino warming in 1997-98
double blow of damage from force of incoming waves and backwash

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