earthquakes

• Focus


  The point in the Earth where the earthquake starts, normally in the mantle
• Epicenter


  The point directly above the focus on the Earth's surface
• Seismic waves


  Vibrations from the earthquake, strongest near the epicenter and weakest further away
• Moment magnitude scale


  Measures earthquakes from 1 to 10
• Earthquake magnitude ≤ 6


  Slight damage to buildings
• Earthquake magnitude ≥ 7


  Major damage and death
• The moment magnitude scale is logarithmic, so a 7 magnitude earthquake is 10 times bigger than a 6 magnitude earthquake