Hawaii telescopes capture volcanic eruptions on Io
Two Hawaii Island telescopes captured images of several eruptions that are changing scientists’ understanding of volcanic activity on Io, one of Jupiter’s moons.
Ashley Davies, a volcanologist with NASA’s Jet Propulsion Laboratory at the California Institute of Technology in Pasadena, Calif., just returned from a trip on Hawaii Island testing a new camera on Pu‘u Oo, where he was studying lava flows. Davies collaborated with Imke de Pater, professor and chairwoman of astronomy at the University of California, Berkeley, and lead author of one of two papers describing the eruptions, in interpreting the data collected with the W.M. Keck Observatory and the Gemini Observatory.
Davies said he is beginning to be able to draw conclusions about Earth’s ancient lava eruption history, based on some of the eruptions being observed on Io. The Earth has “vast plains of lava,” but what scientists can see today is only the end result, Davies said. “Nobody really knows how these things were erupted in the first place. Io is starting to shine a very bright light on how the eruptions behaved.”
Scientists first observed the eruptions in the 1970s, Davies said. At first, scientists didn’t know exactly what they were seeing, and referred to the incidents as outbursts, because of the brief increase in light they emitted. The outbursts are generally thought to be fairly rare, observed about once a year, Davies said.
That is, until last year, when de Pater, using a Keck telescope, noted two eruptions in quick succession, on different parts of Io, on the same day. Within two weeks, de Pater and another UC Berkeley scientist, Katherine de Kleer, observed a third, even brighter eruption, using the Gemini North telescope.
“The frequency is one question that this (raised),” Davies said. “We’ve been speculating about what that might mean.”
Davies has been studying Io since his graduate student days. He said scientists are able to take what they see happen at an active volcano on Earth, including Kileaua and Mauna Loa, and apply that information to Io’s eruptions.
“You can understand how lava would behave on an alien environment,” he said.
At the same time, he said he can take what he observes on Io and apply it to current eruptions here, too. But just because Io is experiencing some of the same kinds of eruptions that were present on Earth, Mars and Venus when the planets were forming, Io isn’t likely to begin to take on characteristics similar to those planets through its volcanic activity, Davies said. For one, Earth, Mars and Venus have atmospheres, which affect how the planets formed, he said. Io does not.
Secondly, Io has a sulfur-rich surface, unlike those planets.
“What we’re seeing is pure volcanism,” Davies said. “It’s a huge amount of fun to watch.”
Davies said he was able to take the observations and calculate how much lava is being erupted. He said the eruptions may come in the form of “curtains of lava” up to 20 kilometers long. The volume of material ejected is incredibly high, and it comes out incredibly quickly.
Rules for posting comments
Comments posted below are from readers. In no way do they represent the view of Oahu Publishing Inc. or this newspaper. This is a public forum.
Comments may be monitored for inappropriate content but the newspaper is under no obligation to do so. Comment posters are solely responsible under the Communications Decency Act for comments posted on this Web site. Oahu Publishing Inc. is not liable for messages from third parties.
IP and email addresses of persons who post are not treated as confidential records and will be disclosed in response to valid legal process.
Do not post:
- Potentially libelous statements or damaging innuendo.
- Obscene, explicit, or racist language.
- Copyrighted materials of any sort without the express permission of the copyright holder.
- Personal attacks, insults or threats.
- The use of another person's real name to disguise your identity.
- Comments unrelated to the story.
If you believe that a commenter has not followed these guidelines, please click the FLAG icon below the comment.