Seismic Waves
Describe how a P-Wave moves
Compressing and expanding as they move through solids or liquids.
The scale that measures I-VII is what?
Mercalli scale
Describe a Normal Fault
A type of fault where the hanging wall slides downward; caused by tension in the crust
What is The instrument that measure Seismic waves?
Seismograph
Describe Shearing
stress that pushes a mass of rock in two opposite directions
What wave arrives last at a seismograph?
Surface waves
What does the Mercalli scale measure?
Damage
What type of plate movement causes a strike slip fault?
Transform
In What order do seismic waves arrive at a seismograph?
P waves, S waves, then Surface waves.
Describe Tension
Stress that stretches rock so that it becomes thinner in the middle
What is the strongest wave?
Surface Wave
What is the least accurate scale?
Richter
Describe a reverse fault
a type of fault where the hanging wall slides upward; caused by compression in the crust
A Frame uses a wire to suspend a weight in the air, also holding a pen writing on a rotating drum that shakes in the event on an earthquake.
Seismograph
Describe Compression
Stress that squeezes rock until it folds or breaks
At what speed do S-Waves move? What can they travel through?
Slower than P-waves but faster than Surface waves and only through solids.
What is considered the most accurate and reliable scale?
Moment magnitude scale
What type of plate movement causes normal fault?
Divergent
How do seismologists use the arrival time of seismic waves to determine the location of the epicenter?
They use the time it took for the seismic waves to arrive at the seismograph then plot a circle around the seismographs location, then repeat the process for at least 2 more locations
Where do most earthquakes occur and why?
Most earthquakes occur at plate boundaries because the friction of the moving rocks cause earthquakes.
What is an L-Wave?
A surface wave
What is the Richter scale good for?
Smaller, closer earthquakes
a type of fault where rocks on either side move past each other sideways with little up or down motion
Strike Slip fault
What is a seismic wave?
an elastic wave in the earth produced by an earthquake or other means.
Where is the ring of fire located?
The Ring of Fire is located around the rim of the Pacific Ocean where there are many subduction zones and transform boundaries.