Seismicity - Tsunamis

Question 1

In the open ocean tsunamis have a very long wavelength of up to ? km

Answer 1

100km

Question 2

In the open ocean tsunamis have a low wave height of under ? metre

Answer 2

1 metre

Question 3

What speeds do tsunamis travel at?

Answer 3

700km/h

Question 4

What happens when they reach shallow water?

Answer 4

they rapidly increase in height and their energy becomes more concentrated

Question 5

What is one of the first warning to coastal populations that a tsunami is coming?

Answer 5

the wave trough infant of the tsunami = drawdown

Question 6

When approaching the coast what height can tsunamis reach?

Answer 6

up to 25metres

Question 7

How far are the effects of tsunamis experienced inland?

Answer 7

500-600 metres

Question 8

What % of tsunamis are generated in the pacific basin?

Answer 8

90%

Question 9

Where are most tsunamis generated in terms of plate boundaries?

Answer 9

convergent where subduction is taking place

Question 10

What does a tsunamis effect when reaching land depend on?

Answer 10

height of waves and distance travelled, length of event that cased the tsunami, extent to which warnings can be given, coastal physical geography, coastal land use and population density