Earthquakes.

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EARTHQUAKES. DEFINITION: EARTHQUAKES DEFINITION: a violent trembling of the earth’s surface.

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Presentation transcript:

Earthquakes

What is an earthquake? a release of energy caused by the sudden movement of tectonics plates The energy is released as “seismic waves” Like ripples in a pond

Fault – an “active zone” boundary between tectonic plates Focus – the exact location where tectonic plates suddenly move Epicenter – the location on the surface of the earth directly above the FOCUS

Where? Earthquakes occur at two different plate boundaries Subduction Zones Plates colliding into each other Transform Faults Plates sliding past each other Moving plates build up lots of energy over time, move very suddenly and release the built up energy

Measuring Earthquakes - Seismograph

Measuring Earthquakes

Earthquake Comparison Northridge 1994 January 17, 1994 (lasted for 10-20 seconds) 6.7 Magnitude on Richter Scale 57 killed, 8 700 injured $20 billion in damage

Haiti 2010 January 12, 2010 7.0 magnitude on Richter Scale, lasted about 60 seconds 100 000 to 160 000 thought to be dead $7-$10 billion in damage