Seismic Hazards A-Level CGP (P81) Near Plate Margins

Most seismic hazards occur around conservative or destructive plate margins but they also occur around ................ margins

What 4 hazards are associated with seismic hazards?

• 1. earthquakes

  2. avalanches

  3. ash clouds

  4. Volcanic gases

• 1. earthquakes

  2. storm surges

  3. pyroclastic flows

  4. Lava flows

• 1) earthquakes

  2) tsunamis

  3) liquefaction

  4) landslides

The nature of an earthquake and its magnitude is affected by its depth of .........., plate margin type and rate of movement.

• epicentre

• fault

• focus

The severity of the hazard also depends on where the seismic event occurs e.g., a mid-ocean earthquake may have fewer impacts than one on land.

• true

• false

The biggest earthquakes occur at ............ plate margins

• conservative

• constructive

• destructive

The area at a destructive plate margin where one plate if forced under another is called a ......................

• collision zone

• subduction zone

• seismic zone

The subduction of a plate causes massive ............... to build up, causing a huge earthquake when it is released

• drag

• pressure

• tension

Earthquakes at constructive margins tend to be ................. than at destructive or conservative margins

• higher magnitude

• lower magnitude

Tectonic plates move in relation to each other at the same rate.

• true

• false

Tectonic plates moves in relation to each other at different rates between .................

• 1 and 15cms per month

• 1 and 15cms per year

• 1 and 15cms every 10 years