Have you ever noticed that the Earth is humming? Seismologists have! Discover how individual storms in the northern Pacific Ocean generate a long-period seismic signal.
Wave propagation
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Seeing the Gravitational Waves, Despite the Seismic Waves
For detectors to sense the minute jolt of a gravitational wave announced last week, savvy geophysicists and engineers had to keep Earth's tiniest jiggles from reaching ultrasensitive instruments.