"There's been quite a lot of aftershocks," Harold Tobin, Washington's state seismologist and the director of the Pacific Northwest Seismic Network, told Business Insider.
The USGS estimates the odds are 1 in 100 of an aftershock with a magnitude of 7 or greater.
The fault region which produced the 7.0 earthquake is a very seismically active one known as the Mendocino triple junction.
The Mendocino triple junction... is right between two notorious earthquake zones, at the northern end of the San Andreas fault and the southern end of the Cascadia Subduction Zone.
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