Plate Tectonic/Earthquake Flashcards
What is the motion of p waves
Push pull
What are the three types of earthquake waves
Primary (P) secondary (S) surface (L)
What is the motion of S waves
Up down
What is the motion of l waves
Up down & side to side
Both
Define and explain reverse faults
Happen at convergent boundaries, block of rock above fault moves up
Define and explain normal faults
Happen at divergent boundaries rock above fault moves down
Describe strike-slip fault
Happens at transform
What’s an epicenter
Location on earths surface directly above the earthquakes focus
What’s a focus
Where rocks move along fault energy is released from focus
Why are there shallow and deep earthquakes in the world
Because of different plate boundaries, deepest at convergent, shallowest at divergent
Seismometer
Measures and records ground motion and can be used to determine the distance which sound waves travel
Seismogram
Graph with circles
Seismograph
Graph used to find circles
What is plate tectonics
Earths surface is made of rigid slabs of rock or plates that move with respect to each other
Oceanic crust
More dense, basalt
Continental
Less dense granite
Why does subduction occur
Because one plate is denser so the denser plate sinks
Features found at divergent boundaries
Oceans
Mid ocean ridge
Ex: Great Rift Valley in East Africa
What is a divergent boundary
Plates moving away from eachother
What is a transform boundary
Plates moving side by side in opposite directions
What features are found at transform boundaries
Faults
Earthquakes
Ex: San Andreas fault system
What features at cc
Mountains (non volcanic)
Ex: Himalayas
What features at o-c
Volcanoes
Trench
Ex:Andes mtn range
What are the features at oo
Volcanoes (island arc)
Trenches
Ex: Aleutians islands
