EQ2 Lesson 14 - Measuring Scales (Volcanoes)

Question 1

What is the primary scale used in measuring volcanic activity

Answer 1

VEI scale

Question 2

What is the VEI scale and what does it measure?

Answer 2

Volcanic Explosivity Index
Size + Force of an eruption

Question 3

What does the VEI scale attribute to an eruption + what is the range of the scale?

Answer 3

Numerical ranking 0 - 8
Qualitative description Effusive - Mega-Colossal

Question 4

Give 3 examples of factors used by the VEI scale

Answer 4

Plume height
Amount + height of ejected material
Duration
Frequency
Tropospheric injection
Stratospheric injection

Question 5

What type of scale is used for the volume of ejected material?

Answer 5

Logarithmic

Question 6

Which 3 rankings are an exception to the logarithmic scale?

Answer 6

VEI 0, VEI1, VEI 2

Question 7

How does VEI relate to frequency?

Answer 7

Higher the VEI ranking, lower the frequncy

Question 8

How much material must a volcano eject for it to be classified as: VEI 0
VEI 8

Answer 8

VEI 0 - <10,000 Square meters
VEI 8 - >1000 Square kilometers