Year 12/13 Plate Tectonics Recap

What is the point on the earth's surface directly above the hypocentre of the earthquake?

• Focus

• Epicentre

• Benioff Zone

• Subduction Zone

What is slab pull?

• When magma locks in the earth's magnetic polarity when it cools.

• The boundary between an oceanic plate that is undergoing subduction.

• The force created by convection currents that moves plates in subduction zones.

• A divergent plate boundary.

Which is not a secondary hazard of an earthquake?

• Tsunamis

• Landslide

• Crustal Fracturing

• Liquefaction

Which is not a primary hazard of a Volcano?

• Lahar

• Lava Flow

• Pyroclastic Flow

• Tephra

This is the ability of a community to country exposed to hazards to resist, absorb and recover from the impacts of a hazard. This can often prevent a hazard from becoming a disaster.

• Mitigation

• Resilience

• Vulnerability

• Risk

6 criteria are used to build up a hazard profile which of these is not included?

• Magnitude

• Number of deaths.

• Duration

• Areal Extent

• Frequency

Which is not a characteristic of a mega-disaster?

• Large-scale - in terms of area and impacts.

• Pose huge challenges

• Require substantial amounts of international disaster aid.

• Occurs frequently.

What is the second stage of Park's Disaster Reponse Curve?

• Reconstruction

• Rehabilitation

• Pre-disaster

• Relief

There are 3 basic actions that can be undertaken to mitigate the impacts of tectonic hazards - which isn't one ...

• Modify vulnerability and resilience

• Modify the loss

• Modify the cost

• Modify the event

Shield volcanoes are found at divergent plate boundaries - but what is the lava like?

• Basaltic - low silica / gases. Very runny (low viscosity) - not very explosive.

• Andesitic - high silica / gases. Sticky (high viscosity) & explosive.