transform boundaries

smt 2, qtr 2

transform boundaries

• plates slide against each other in opposite directions

• no volcanoes and mountains are produced

earthquakes

result from this movement of plates & release massive amounts of energy

faults

cracks on earth’s crust

fault plane

surface where the blocks slip past each other

normal / reverse / strike-slip

3 types of faults

dip-slip

• movement of faults along the angle of the fault plane

• angle = dip

• movement = slip

• normal / reverse fault

normal fault

hanging wall slips downward w/ respect to the footwall along a dip angle

hanging wall

block that sits on a fault plane

reverse fault

block of earth’s crust pushes upward & along the dip angle

thrust fault

• type of reverse fault

• angle of the dip is 45º or less

strike-slip fault

• nearly vertical fault planes

• surfaces slide in parallel but opposite directions

• when plates get stuck / stop moving, energy builds up between them

san andreas fault

• ca, usa

• example of strike-slip

oblique-slip fault

• combination of a strike-slip & a dip-slip

• block of earth’s crust slides horizontally & diagonally up or down from each other

• energy reverberates through the crust & mantle, releasing seismic waves that are felt as earthquakes