Earthquakes Flashcards
What are the four layers of the earth
Inner core, outer core, mantle, crust
How is the mantle split
Upper and lower
How is the upper mantle split
Lithosphere and astgenosphere
What are body waves
Waves that move beneath the surface
Frequency
Number of peake in a wave
Amplitude
Height of peaks in a wave
Types of b waves
Primary and Secondary waves
P waves
Compression Moves in the same direction as the wave Fastest wave Like an accordion Travels through solids and liquids Slower in liquids Faster in solids
S waves
Perpendicular to the direction of the wave Arrive after p waves Slower than p waves Side to side wave s Can only travel through solids
Surface waves
Waves that reach the s ur face of the earth
Types of surface waves
Love and Raleigh waves
L waves
Surface motion that is side to side or back and forth
Raleigh waves
Waves that move up and down…only on string earthquajes
Earthquake
A large and sudden release of energy
Occurs 90 in the crust
Magnitude
The strength of an earthquake
Intensity
Damage an earthquake causes
Focus
The exact starting point if the earthquake underground
Epicenter
The point on the surface directly above the focus
Plate boundaries
Edges where two plates meet
Divergent
Plates move apart
Convergent
Plates move together
Types of convergent
Land to land : mountains
Land to sea : trenches
Transform
Plates that move sideways past one another due to tension
Fault
Cracks in the earths crust where there is movement