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RESTRICTIONS: Broadcast: NO USE JAPAN, NO USE TAIWAN Digital: NO USE JAPAN, NO USE TAIWAN
New research has found a huge cache of magma hidden underneath one of the largest supervolcanoes in the world.


Forbes reports that California's Long Valley supervolcano erupted some 760,000 years ago, spewing out hot ash, lava, and toxic gas for 6 days that resulted in the formation of a massive caldera.


Since 1978, a gradual uplift has been observed in the caldera center, likely from magma flowing into a chamber below the supervolcano.


Using seismic tomography, researchers from the USGS California Volcano Observatory were able to show a more detailed view of the subsurface, which they published in the journal Geology.


They discovered that the reservoir beneath the supervolcano contained 240 cubic miles of semi-molten magma, 27% of which was in a liquid state.


An eruption would require at least 50% of the magma to be liquid, so there is no immediate threat. However, when Long Valley does eventually erupt, it's likely going to be a massive catastrophe similar to the one from hundreds of thousands of years ago.


Since scientists aren't be sure how magma is distributed within the reservoir, normal eruptions are also a possibility, so they're keeping a close eye on the caldera.


RUNDOWN SHOWS:
1. Depiction of Long Valley supervolcano eruption 760,000 years ago
2. Depiction of Long Valley caldera dome growing
3. Depiction of seismic tomography revealing magma reservoir
4. Depiction of 240 cubic miles of magma under Long Valley, with 27% in liquid form


VOICEOVER (in English):


"California's Long Valley supervolcano erupted some 760,000 years ago, spewing out hot ash, lava, and toxic gas for 6 days that resulted in the formation of a massive caldera."


"Since 1978, a gradual uplift has been observed in the caldera center, likely from magma flowing into a chamber below the supervolcano."


"Using seismic tomography, researchers from the USGS California Volcano Observatory were able to show a more detailed view of the subsurface."


"They discovered that the reservoir beneath the supervolcano contained 240 cubic miles of semi-molten magma, 27% of which was in a liquid state."


SOURCES:
Geological Society of America, Forbes
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