Earthquakes

Question 0

Explain the occurrence of an earthquake at a conservative margin.

Answer 0

Two plates are sliding against each other in opposite directions or at different speeds. The plates create friction as they slide at force, building up pressure. When one plate suddenly shifts, the pressure is released. This is an earthquake.

Question 1

What are earthquakes caused by?

Answer 1

Release of tension or pressure at a plate margin.

Question 2

What is the epicentre?

Answer 2

The point on the earth’s surface where the earthquake is felt (directly above the focus).

Question 3

What is the focus?

Answer 3

The point in the lithosphere where the pressure/ seismic waves are released.

Question 4

What are the two times of seismic wave IN THE LITHOSPHERE?

Answer 4

Primary (P)

Secondary (S)

Question 5

What are the two types of surface waves?

Answer 5

Rayleigh

Love

Question 6

Describe P wave movement.

Answer 6

Push and pull the earth in the same direction the wave is travelling in. They travel very fast.

Question 7

Describe the movement of an S wave.

Answer 7

S waves move at a 90 degree angle to the direction of travel (side to side). These waves are likely to cause more damage.

Question 8

Describe Love wave movement.

Answer 8

Love waves move the surface from side to side, causing a great deal of damage.

Question 9

Describe Rayleigh wave movement

Answer 9

Move the surface in a rolling motion, much like a water wave in the ocean.