Mysterious Tremors’ Strength Ebbs With Tides

Publication: National Geographic News   Date: November 22, 2007   View Article

The intensities of strange, long-lasting tremors in North America’s Pacific Northwest ramp up and quiet down with the rise and fall of the ocean’s tides, according to a new study.

These so-called nonvolcanic tremors are very faint seismic signals that were not discovered until 2002. Their exact cause remains a mystery.

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