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Geography > the SUPERVOLCANO map > Flashcards

the SUPERVOLCANO map Flashcards

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1
Q

What is the average ashfall range for a typical volcano eruption?

A

300 miles

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2
Q

How far did Yellowstone’s SUPER eruptions spread ash?

A

1500+ miles

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3
Q

How many number of eruptions were there from Yellowstone since its last SUPER eruption?

A

30

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4
Q

When was the most recent eruption at Yellowstone?

A

70,000 years ago

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5
Q

What do GPS satellites constantly measure for changes in?

A

Ground elevation

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6
Q

What is the main seismic monitoring agency?

A

University of Utah at Salt Lake City

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7
Q

What is the number of seismograph stations within and near Yellowstone to monitor quake activity?

A

33

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8
Q

What is the Official Federal Office for daily volcano monitoring?

A

Yellowstone Volcano Observatory (Y.V.O.)

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9
Q

How long ago was “Lava Creek” Tuff area of ash by SUPER eruption?

A

640,000 years ago

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10
Q

How long ago was “Huckleberry Ridge” Tuff area of ash by SUPER eruption?

A

2.1 million years ago

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11
Q

How long ago was “Mesa Falls” Tuff area of ash by SUPER eruption?

A

1.3 million years ago

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12
Q

What is the area and layer of soil created by volcanic eruption?

A

Tuff

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13
Q

What is the eruption “Hot Spot” source?

A

Magma Chamber

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14
Q

What is a caldera?

A

a prior eruption from the same hot spot underneath the region

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15
Q

What is the depth below the current Yellowstone caldera?

A

5 miles

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16
Q

What is the overall direction of North America’s plate movement over this hot spot?

A

Southwest

17
Q

When was the first Yellowstone hot spot formed?

A

16 million years ago

18
Q

What has magma pressure created since the last SUPER eruption?

A

Two Resurgent Domes

19
Q

What is the approximate height for each 7 x 10 mile dome in Mallard Lake and Sour Creek?

A

1000 feet

20
Q

How far has the caldera basin risen since the 1920’s?

A

2 feet

21
Q

What are the dimensionsof Volcano Caldera?

A

35 x 50 mi.

Geography (8 decks)

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