An event known as an “episodic tremor and slip” began as predicted in the Pacfic Northwest this week. These tremors are so small that they aren’t felt by humans, however they will cause parts of the Pacfic Northwest and Canada to move roughly 3 millimeters west over the next 2 weeks. The movement is slower than a traditional earthquake but more rapid than the normal creep associated with the fault. It runs in the reverse direction of the normal creep. [...] The event does not mean an earthquake is imminent, but geologists are eager to study it and learn more and they say sooner or later an ETS event is likely to trigger a major quake.
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