article_snippet.sent: Earthquakes shake the planet in such a way that Earth Earth can oscillate for months after the seismic event.
article_snippet.sent: In the late 1990s, however, seismologists found that the planet doesn't just oscillate following quakes, and instead is vibrating at extremely low frequencies all of the time.
article_snippet.sent: vibrations and researchers in the mid-1980s aren't powerful enough to be detected by humans, but are strong enough to register on seismometers and similar.
article_snippet.sent: Earthquakes shake the planet in such a way that Earth can oscillate for months after the seismic event.
article_snippet.sent: In the late 1990s, seismologists found that the planet doesn't just oscillate following quakes, and instead is vibrating at extremely low frequencies all of the time.