The skyscraper-sized tsunami that vibrated through the entire planet and no one saw

By Stephen Hicks, Research Fellow in Computational Seismology, UCL
Kristian Svennevig, Senior Researcher, Department of Mapping and Mineral Resources, Geological Survey of Denmark and Greenland

Earthquake scientists detected an unusual signal on monitoring stations used to detect seismic activity during September 2023. We saw it on sensors everywhere, from the Arctic to Antarctica.

We were baffled – the signal was unlike any previously recorded. Instead of the frequency-rich rumble typical of earthquakes, this was a monotonous hum, containing only a single vibration frequency. Even more puzzling was that the signal kept going for nine days.

Initially classified as a “USO” – an unidentified seismic object – the source of the signal was eventually traced back to…

Read complete article

~	Indonesia’s BRICS agenda: 2 reasons Prabowo’s foreign policy contrasts with Jokowi’s

~	Rising Voices: Listening to the world on its own terms

~	Moldova has introduced a state of emergency in the energy sector

~	Syria: Rights investigators call for protection of evidence, including mass grave sites

~	Brazil Bans X from Using Children to Power Its AI

~	El Salvador: A thousand days into the state of emergency. “Security” at the expense of human rights.

~	Prince Andrew and the British establishment’s ‘target-rich environment’ for spies

~	Times journalists deemed ‘legitimate military targets’ – how Russia muzzles criticism at home and abroad

~	Climate, migration and conflict mix to create ‘deadly’ intense tropical storms like Chido

~	What the colour of your snot says about your immune health