Seismic Hazards A-level CGP(P82/83) Earthquakes

A ...................occurs when natural tension in the bedrock changes so rapidly that the rock mass breaks, i.e. fractures. When the shock wave hits the surface it is felt as a vibration.

• seismic disaster

• seismic event

• seismic hazard

The primary hazard associated with a seismic event is an ..................

• earthquake

• tsunami

• volcano

Earthquakes are caused by the ................ that builds up at plate margins.

• friction

• tension

• drag

Earthquakes are associated with what types of plate margins?

• conservative

• constructive

• destructive

• all three types of plate margin

When the plates jerk past each other ................. (vibrations) are sent out. These vibrations are the earthquake.

• seismic waves

• shockwaves

• radio waves

The ........... is the place inside the Earth's crust where an earthquake originates.

• epicentre

• focus

Near the focus the shockwaves are stronger and cause more damage.

• False

• True

The focus is not necessarily a single point it could be a ............ line.

• fault

• fold

• rift

When referring to earthquakes being along fault lines, a fault lies at the ................... between Earth's tectonic plates, in the crust, and the earthquakes result from the plates' movements.

• major boundaries

• plate margins

• either they mean the same thing

The .............. is the point on the Earth's surface, where the earthquake is felt first and it is positioned straight above the focus