Geography: Earthquakes

shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity.

The point WITHIN the Earth's crust where an earthquake starts

the point on the Earth's surface directly above the focus of an earthquake

A scale that rates an earthquake's magnitude based on the size of its seismic waves

a scale that rates earthquakes according to their intensity and how much damage they cause at a particular place

Longitudinal waves Cause an up and down movement

Transverse waves Cause a side to side movement

Primary waves travel faster than secondary waves

Seismometer Instrument used to measure horizontal or vertical motion during an earthquake

Constructive margin earthquakes are weaker in strength

Destructive and conservative margin Earthquakes are stronger in strength