What is the focus of an earthquake?

The point underground where the earthquake starts and energy is first released

Where is the epicentre of an earthquake located?

On the Earth's surface directly above the focus

Stress builds as plates move, then is released suddenly when the rock slips

The type of magma, especially its viscosity and gas content

Their magma is thick and gas-rich, so trapped gases build pressure until released violently

A pyroclastic flow of hot gas, ash and rock

A large undersea earthquake that displaces a huge volume of water

Because the wave slows in shallow water and its energy is forced into a smaller depth, increasing its height

The sea suddenly retreating far from the shore, exposing the sea bed

Fertile soils, minerals, geothermal energy and tourism provide real benefits

If a hazard is rare or felt to be manageable, people weigh it against the everyday benefits of staying

Building earthquake-resistant buildings and sea walls

By giving warning so people can evacuate and emergency services can prepare

Because human factors such as building quality, preparation and the speed of response differ, strongly shaped by wealth

14questions. Pick an answer and you'll see why right away.

What is the focus of an earthquake?
Where is the epicentre of an earthquake located?
How does an earthquake actually occur along a fault?
Which factor most controls whether a volcanic eruption is gentle or explosive?
Why do composite volcanoes at convergent boundaries tend to erupt explosively?
Which of these is a hazardous product of an explosive volcanic eruption?
What event most commonly triggers a tsunami?
Why does a tsunami grow tall as it approaches the coast?
What is a recognised natural warning sign that a tsunami may be coming?
Which of these is a reason people continue to live in volcanic areas?
How does the perception of risk influence whether people stay in a hazardous area?
Which is an example of protection against tectonic hazards?
How can prediction and monitoring reduce the impact of a tectonic hazard?
Why do two earthquakes of similar magnitude often cause very different numbers of deaths?