Scales to measure hazards

Question 1

Richter scale

Answer 1

A numerical scale for expressing the magnitude of an earthquake. The higher the number the higher the magnitude of the event. It is measured by the largest waves amplitude.

Question 2

Mercalli scale

Answer 2

A twelve point scale for expressing the local intensity of an earthquake, ranging from I to XII. It is measure by the effects of the earthquake.

Question 3

Moment magnitude index

Answer 3

A measure of an earthquakes magnitude based on its seismic moment. It is measured by the product of the distance a fault moved because of the earthquake.

Question 4

Volcanic explosivity index

Answer 4

Also known as VEI this is a scale that describes the size of explosive volcanic eruptions based on the magnitude and intensity.

Question 5

Saffir Simpson scale

Answer 5

A measurement of a hurricane. It is measured by the hurricanes maximum sustained wind speed.