How big is that earthquake?

Earthquake corner at St Edward's Junior High, LeekKeith Brown MSP (Minister for Schools and Skills) visited Dunblane High school to learn about how they are using their School Seismometer.Analysing our first earthquakeChecking the clearancesWe can make our own earthquakesDetecting vibrations is easyEdinburgh teachers discuss dampingGlasgow teachers grateful for all practice IKEA gave them with allen keysIf all else fails read the manual!Model seismometerScottish launch at dynamic earthScottish minister examines seismometerShake tableShaking a jelly towerSimple stick-slip earthquake machineSometimes workshops feel like christmasWaiting for the earthquake

Scientists mainly use two separate scales when calculating the size of an earthquake, intensity and magnitude:

Earthquake scales

Macroseismic mapEarthquake intensity

This is a measure of how much the ground shakes at a particular point.

Magnitude spheres.Earthquake magnitude

Magnitude is a number that indicates how much energy an earthquake has released.