Scientists and a rattled public are eager to know what caused such a powerful eruption, and what may happen next
, which uses a global distribution of radio receivers that can “hear” the lightning as intense bursts of radio waves. During the first two weeks, the system recorded sometimes a few hundred or a few thousand flashes per day—nothing unusual. “It was clearing its throat, I guess,” says Vagasky.Vaisala meteorologist
“I couldn’t believe the numbers I was seeing,” says Vagasky. “You don’t usually see that with a volcano. This is something else. There was nowhere else that was that electric on the planet last night.” The heat of the eruption also readily transports water vapor into the colder, higher reaches of the atmosphere, where it becomes ice, says, an experimental volcanologist at the Ludwig Maximilian University of Munich. That provides plenty of additional particles for the ash to collide with and generate electricity.
These events require displacing a lot of water, which can happen through underwater explosions, through a collapse event—when lots of rock suddenly falls off the volcano into the sea—or a combination of these and other factors.
France Dernières Nouvelles, France Actualités
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