An underwater volcano erupted in January near the Pacific nation of Tonga and sent massive pressure waves racing through Earth's atmosphere, where they lapped the planet several times.
– a dense layer of electrically charged particles that lies about 35 to 620 miles above the planet's surface.
Based on historical data, the 1883 Krakatau eruption generated Lamb waves that circled the Earth the same number of times, the researchers reported. study has provided more detail as to how these waves propagated, using various geophysical measurements, Žagar told Live Science in an email.study, Kubota and his colleagues connected the dots between these Lamb waves and the speediest tsunamis observed after the eruption. The timing of the Lamb waves and"forerunner" tsunamis seemed to coincide, they found.
In addition to huge Lamb waves and fast-moving tsunamis, the Hunga eruption also produced incredibly long-range sound waves and infrasound waves – meaning acoustic waves too low in frequency to be heard by humans, Matoza and his colleagues reported.
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