Occurance of Earthquakes

Beschreibung

Leaving Cert Geography (Physical Geography) Mindmap am Occurance of Earthquakes, erstellt von Tom Cahill am 27/10/2013.
Tom Cahill
Mindmap von Tom Cahill, aktualisiert more than 1 year ago
Tom Cahill
Erstellt von Tom Cahill vor etwa 11 Jahre
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Zusammenfassung der Ressource

Occurance of Earthquakes
  1. Plate Tectonics (Theory)
    1. lithosphere consists of large, rigid sections called plates
      1. Convection Currents - driving force
    2. Earthquakes
      1. Sudden release of energy on earths surface
        1. vibrations or shocks
      2. Plates
        1. Jam or stick together
          1. build up of stress in rocks
            1. stress releases - plates slip
              1. seismic waves
          2. Shallow Focus (<70km)
            1. passive boundaries
              1. Pacific and N. American
              2. smaller magnitude than deep focus
                1. account for 75% of earthquakes
                2. Deep Focus (300km)
                  1. convergent
                    1. heaviest plate is subducted
                    2. Indian and Eurasian
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