Presentation on theme: " A reverse fault can be compared to a convergent boundary- at both pieces of land collide together As reverse faults push together, the hanging wall."— Presentation transcript:
A reverse fault can be compared to a convergent boundary- at both pieces of land collide together As reverse faults push together, the hanging wall slides up As convergent boundary is pushed together, the two plates fold up or down creating things like mountains or valleys.
When stress is put on a fault, the hanging wall slides up This causes earthquakes (or when they’re under water- tsunamis.
Partially solid magma below the surface (in the mantle) churning- known as convection currents Convection currents move plates by putting stress on them
Plates move about two inches every year unless they can’t move The longer a plate can’t move, the more stress is built up When the stress is released there’s move movement… the longer a plate has to wait, the bigger the magnitude of the earthquake.
Damage done of an earthquake depends on the depth of the focus There are three different types of earthquakes: shallow= 200 feet intermediate=200-500 feet deep= 500 feet Because Earth’s lithosphere is about 500 feet deep typically- deep focus earthquakes normally happen on land
Earthquakes with shallow focus’ can still cause a lot of damage, even if it’s very low magnitude because it doesn’t need to travel as far to reach the surface If an earthquake has a deeper focus, less damage will be done because the materials on top of it reduce the power of the waves The greater the mass of the materials above the focus, the more reduction of power there is