What particular volcanic hazard is assessed for hazard zoning based on the height of the eruption column, and strength and direction of the wind?

Question

1.What particular volcanic hazard is assessed for hazard zoning based on the height of the eruption column, and strength and direction of the wind?

A.

lahar

B.

pyroclastic flow

C.

lava flow

D.

pyroclastic fall

2.During a volcanic eruption, which of the following information must be known by the communities near the volcano?

A.

signs of an impending eruption

B.

expansion of the danger zones

C.

classification of the volcano

D.

the specific time of evacuation

3.What data must be assessed for volcanic explosivity index (VEI)?

A.

eruption type

B.

casualties

C.

amount of rainfall

D.

population inside the PDZ

4.What information can be obtained from a volcano hazard map?

A.

areas prone to ground swells, ground tilt, and ground fissures

B.

areas highly prone to ash fall

C.

areas prone to volcanic earthquakes

D.

areas with increased steaming activity

5.What particular volcanic hazard is assessed for hazard zoning based on silica composition, effusion rate, and temperature?

A.

lahar

B.

pyroclastic fall

C.

lava flow

D.

pyroclastic flow

6.During an alert level 5 status, which statement correctly explains the situation?

A.

Danger is exclusive within the 6-km radius PDZ.

B.

Evacuation will be implemented in the 6-km radius PDZ.

C.

no entry within the extended danger zone

D.

no entry outside the extended danger zone

Answer 1

While I don't believe in simply giving you answers to multiple choice, I will describe each hazard and I hope the answer will be clear afterwards.

(1) and (5) Remember the key words in the question: eruption height and wind direction. What does this suggest about the nature of the hazard?

-Lahar: a mudflow comprised of pyroclastic (particles of igneous material) material, debris, and water. Typically due to the melting of snow and ice at the top of a volcano.

-Pyroclastic Flow: an erupted cloud of molten igneous material small and hot enough to be suspended in the air and ash that travels quickly.

-Lava flow: lava is molten rock on the surface of the Earth.

Other questions I'd be happy to answer in a call, this is a lot of material to go over in this format!