It is linked to the tsunami and volcanic plume generation and is also likely related to the higher-frequency infrasound and acoustic waves from the eruption." "By understanding the Lamb wave, we can better understand the source and eruption. We have very few high-quality observations of them," Fee said. With the Hunga eruption, the wave traveled along Earth's surface and circled the planet in one direction four times and in the opposite direction three times - the same as observed in the 1883 Krakatau eruption. They can last from minutes to several hours.Ī Lamb wave is a type of guided wave, those that travel parallel along a material's surface and also extend upward. The largest atmospheric explosions, such as from volcanic eruptions and nuclear tests, create Lamb waves. The researchers found particularly interesting the behavior of the eruption's Lamb wave, a type named for its 1917 discoverer, English mathematician Horace Lamb. "This has implications for monitoring nuclear explosions, volcanoes, earthquakes and a variety of other phenomena." "The atmospheric waves were recorded globally across a wide frequency band, and by studying this remarkable dataset we will better understand acoustic and atmospheric wave generation, propagation and recording," he said. "Our hope is that we will be better able to monitor volcanic eruptions and tsunamis by understanding the atmospheric waves from this eruption," said Fee, who is also the coordinating scientistat the Geophysical Institute's portion of the Alaska Volcano Observatory. A dense network of barometers, infrasound sensors and seismometers in Alaska - operated by the Geophysical Institute's Wilson Alaska Technical Center, Alaska Volcano Observatory and Alaska Earthquake Center - contributed to the data. The Hunga eruption, near the island of Tonga, has provided unprecedented insight into the behavior of some atmospheric waves. The team's work, compiled in an unusually short amount of time due to significant scientific interest in the eruption, was published today in the journal Science.ĭavid Fee, director of the Wilson Alaska Technical Center at the University of Alaska Fairbanks Geophysical Institute, is a leading author of the research paper and among four of the center's researchers involved in the work. Those are among the many observations reported by a team of 76 scientists from 17 nations that researched the eruption's atmospheric waves, the largest known from a volcano since the 1883 Krakatau eruption.
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