1.1C intra-plate earthquake stuff

• Intra-plate earthquake = an earthquake which occurs within a plate boundary
• Causes of inter-plate earthquakes:

  • movement going up along ancient fault lines
  • fault lines being re-activated by tectonic stress
• intra-plate volcanoes = they're are distant from a plate boundary at locations called mid-plate hotspots
• hotspots =

  Isolated plumes of convecting heat, called mantle plumes, rise towards the surface, generating basaltic volcanoes that tend to erupt continuously. 

  A mantle plume is stationary, but the tectonic plate above moves slowly over it. 

  Over millennia, this produces a chain of volcanic islands, with extinct ones most distant from the plume's location. 
• mantle-plumes = concentrated areas of heat convection. At plate boundaries they are sheet-like, whereas at hot spots they are column like.