Eaeth Quakes

Question 0

Faults

Answer 0

Faults are breaks in the lithosphere usually found along tectonic plate boundaries

Question 1

Earthquakes occur due to what

Answer 1

Movement on faults

Question 2

Mechanism for earthquakes is known as the…

Answer 2

Elastic rebound theory

Question 3

Steps to elastic rebound theory

Answer 3

Rocks get locked and deformed by forces
Rocks bend and store elastic energy
Friction resistance is overcome
Stored energy is released all at once and rocks snap back to its original shape

Question 4

Type of seismic waves body waves

Answer 4

P -waves 
Primary/pressure
Push pull 
Solids liquids gas
Faster wave

Question 5

2nd Types of waves body waves

Answer 5

S waves
Right angles to their direction 
Only thru solids
Slower 
Sideways
More dangerous

Question 6

Surface waves

Answer 6

Couples
Great destruction
High amplitude and low velocity

Question 7

A seismograph

Answer 7

Records ground motion

Question 8

Seismogram

Answer 8

Is the actual recording

Question 9

What is used to determine distance from epicentre

Answer 9

Arrival of p and S waves

Question 10

How many circles u need to pinpoint earthquake

Answer 10

3

Question 11

How does wave speed increase

Answer 11

Increase with density

Question 12

Refraction

Answer 12

Change in direction with changing medium

Question 13

Medium=

Answer 13

Material that a wave of energy passes through

Question 14

Moho

Answer 14

Crust/mantle boundary

Question 15

Plastic asthenosphere =

Answer 15

Decrease in wave velocity (low velocity zone)

Question 16

P wave shadow zone

Answer 16

103* to 143* from epicentre due to refraction accross layers

Question 17

S shadow

Answer 17

Due to liquid layer 103-103

Question 18

Seismic risks

Answer 18

Geopraphic location (boundaries)
Topography (mudslides)
Ground strength (rock type)
Construction (buildings)

Question 19

Predictions

Answer 19

Micro seismicity+
Bulging +
Electrical -
Groundwater -
Radon +

Question 20

Faults move past each other slowly

Answer 20

Fault creep

Question 21

Measure of earthquake 1

Answer 21

Mercali (intensity)

Question 22

Measure of scale 2

Answer 22

Richter (magnitude)

Question 23

Buoyancy

Answer 23

Low density rock masses floating on high density accounts for roots of mountain belts

Question 24

Isotatic rebound

Answer 24

Land moves up, creating uplifted beaches