EQ1: Why are some locations more at risk from tectonic hazards? Flashcards
How long has the Earth’s crust been moving for?
At least 225 million years, since the supercontinent of Pangaea split apart. This movement created numerous tectonic events e.g earthquakes and volcanoes and secondary events such as earthquakes and volcanoes.
What is a rock
LOL
Who first suggested continental drift and when?
Geophysicist Alfred Wegener in 1912
When was the plate tectonic theory accepted?
1960s
How much will the world’s population grow by 2050?
Predicted by the UN to reach 9.7 billion in 2050. The potential for a mega-disaster is increasing.
What creates different types of plate boundaries?
Different major tectonic plates (e.g Africa), minor plates (e.g Cocos)
What creates different types of plate boundaries?
Different major tectonic plates (e.g Africa), minor plates (e.g Cocos) and micro-plates (e.g Sunda). These plates often move in different directions and at different speeds, creating different types of plate boundary and therefore variations in earthquake and volcanic activity.
Where is most earthquake and volcanic activity found?
In zones along the plate boundaries.
Where does lots of volcanic activity occur?
In the “ring of fire”. The “ring of fire” is a group of volcanoes that are located along the plate margin of the Pacific plate.
What is the boundary which creates earthquakes with a magnitude of 9 Mw or higher associated with?
Convergence between an oceanic plate and a continental plate (a destructive plate boundary with subduction).
Convergence
Coming together/meeting at a certain point
Divergence
Separating
Converging currents
Drive plates into each other
Diverging currents
Pull plates apart
