Large magma reservoir discovered beneath Long Valley supervolcano

Large magma reservoir discovered beneath Long Valley supervolcano

Assessment

Interactive Video

Science, Geography, Biology

11th Grade - University

Hard

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The Long Valley supervolcano erupted 760,000 years ago, forming a massive caldera. Since 1978, uplift in the caldera center suggests magma inflow. Seismic tomography by USGS researchers revealed a detailed view of the subsurface, showing a reservoir with 240 cubic miles of semi-molten magma, 27% of which is liquid.

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5 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What major geological event occurred 760,000 years ago at the Long Valley supervolcano?

A massive earthquake

A significant volcanic eruption

A large meteor impact

A major flood

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What was the result of the Long Valley supervolcano eruption?

Emergence of a new island

Formation of a mountain range

Development of a desert

Creation of a massive caldera

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What has been observed in the caldera center since 1978?

A decrease in volcanic activity

A gradual uplift

A sudden collapse

A new volcanic eruption

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What technique did researchers use to study the subsurface of the supervolcano?

Ultrasound scanning

Seismic tomography

Magnetic resonance imaging

X-ray diffraction

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What percentage of the magma reservoir beneath the supervolcano is in a liquid state?

50%

27%

15%

75%