What is an earthquake?
shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity.
What is the focus of an earthquake?
The point WITHIN the Earth's crust where an earthquake starts
What is the epicentre?
the point on the Earth's surface directly above the focus of an earthquake
What is the Richter scale?
A scale that rates an earthquake's magnitude based on the size of its seismic waves
What is the Mercalli scale?
a scale that rates earthquakes according to their intensity and how much damage they cause at a particular place
What are Longditudinal waves?
Longitudinal waves Cause an up and down movement
What are Transverse waves?
Transverse waves Cause a side to side movement
what are Primary waves?
Primary waves travel faster than secondary waves
What is a seisometer?
Seismometer Instrument used to measure horizontal or vertical motion during an earthquake
Constructive margin earthquakes are weaker in strength
Destructive and conservative margins?
Destructive and conservative margin Earthquakes are stronger in strength