earthquakes

Question 1

what is the focus

Answer 1

where the earthquake originates from

Question 2

what is the epicentre

Answer 2

the point directly above the focus on the earths surface

Question 3

seismic waves

Answer 3

the energy spreading out from the focus

Question 4

fault

Answer 4

the joint between two moving plates

Question 5

describe the 4 steps of an earthquake happenening

Answer 5

1. plates try to move
2. friction caused them to get stuck and pressure builds up
3. pressure gets too high and plates shift in a sudden movement
4. vibrations are sent through the ground causing earthquakes

Question 6

what are the two scales that are used to measure earthquakes

Answer 6

mercalli and richter

Question 7

how does the mercalli scale measure earthquakes?

Answer 7

the impacts

Question 8

how does the richter scale measure earthquakes?

Answer 8

the magnitude

Question 9

positives of the mercalli scale

Answer 9

the mercalli scale is good to see what the impact of an earthquake and how much damage is has caused

Question 10

negatives of mercalli

Answer 10

it is subjective so not very accurate. cannot be used in remote areas. it is hard to compare earthquakes as there is a twelve point scale that does not have decimals.

Question 11

negatives of richter

Answer 11

it does not tell you how much damage has been done in an earthquake.

Question 12

positives of richter

Answer 12

objective and uses a scientific machine so more accurate. can be used in uninhabited areas. uses decimals so it’s easier to compare.

Question 13

primary effects

Answer 13

fissures in roads, ground shaking, dam distrurbances, gas and water pipes bursting, landslides, building collapsed. ground ruptured

Question 14

secondary effects

Answer 14

roads blocked. dam disturbances, floods, tsunamis, contaminated water, soil liquefaction, aftershocks