New Satellite Adds Evidence of an Earth-Shaking Wave

New Satellite Adds Evidence of an Earth-Shaking Wave

On 16 September 2023, a low hum started swaying seismometers around the world. Unlike during the short and jagged frenzy of an earthquake, this signal wobbled every 92 seconds and continued for 9 days. About a month later, while seismologists were still puzzling over the incident, the hum started again and lasted roughly a week. Researchers traced the confusing signals to East Greenland, where satellite imagery revealed the scars of recent rocks…