Cooling trend in California supervolcano, but seismic risks still loom

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Cooling trend in California supervolcano, but seismic risks still loom
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The Long Valley Caldera was formed 760,000 years ago by a catastrophic eruption that sent 650 cubic kilometers of ash into the atmosphere.

This activity is of high concern since it is taking place in the Long Valley Caldera area, located on top of a massive dormant supervolcano. "We don't think the region is gearing up for another supervolcanic eruption, but the cooling process may release enough gas and liquid to cause earthquakes and small eruptions. For example, in May 1980, there were four magnitude 6 earthquakes in the region alone,” said Zhongwen Zhan in an's magma chamber is encircled by a hardened cap of crystalline rock, which also points to molten magma gradually cooling and solidifying.

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