Earthquakes

What is an Earthquake?

Used to describe both sudden slip on a fault, and the resulting ground shaking and radiated seismic energy caused by the slip.

We Will Write a Custom Essay Specifically
For You For Only $13.90/page!


order now


Caused by volcanic or magamitic activity.


Caused by other sudden stress changes in the Earth.

What are the 3 types of faults and definitions?

Strike Slip- causes worst earthquakes (transform)


Thrust- hit each other and one goes under (convergent)


Normal- pull away (divergent)

What causes earthquakes?

Tectonic plates move past each other causing stress. Stress causes the rock to deform.

What are the Plastic and Elastic Deformation definitions?

Plastic Deformation- does not cause earthquakes.


Elastic Deformation- rock stretches then reaches a breaking point, releasing energy.

Elastic Rebound

Deformed rock goes back to its original shape.

Focus and Epicenter

definitions

Focus- point inside the Earth where an earthquake begins.


Epicenter- point on Earth’s surface above focus.

Primary Waves

(P waves)

A type of seismic waves that compresses and expands the ground.


The first wave to arrive from an earthquake.

(pushing slinky forward)

Secondary waves

(S waves)

A type of seismic wave that moves the ground up and down or side to side.


(shaking a jump rope)

Comparing P waves and S waves
[image]
Surface Waves

Move along Earth’s surface.


Produces motion in the upper crust.

   -Motion can be up & down

   -Motion can be around

   -Motion can be back & forth


Travel more slowly.


More destructive.

How do Scientists calculate how far a location is from the epicenter of an earthquake?

Scientists calculate the difference between arrival times of the P waves and S waves.


The further away an earthquake is, the greater the time between the arrival of the P waves and the S waves.

Leave a Reply
Your email address will not be published.
*
*

BACK TO TOP
x

Hi!
I'm Colin!

Would you like to get a custom essay? How about receiving a customized one?

Check it out