The National Weather Service issued tsunami Warnings and Advisories for much of the southern Alaskan coast and the Aleutian Islands but these have since been cancelled.
The scientists were able to detect the structure by analyzing seismic wave data.
"It seems clear that something is brewing underneath the heart of northwest Europe," said researcher Corné Kreemer.
With a third of the population now under lockdown, the subsequent drop in industry and transport appears to have led to a drop in the planet's "seismic noise."
The quakes occurred along the Mendocino Fracture Zone at the junction between the San Andreas Fault and Cascadia Subduction Zone.
The small earthquakes were recorded by the USGS near Greenback and Sweetwater.
Local residents took to social media to report light shaking felt across the region, but no injuries or damage were reported.
The quake is the latest in a series of tremors that have struck the region in recent months.
Controversial research suggests these two huge tectonic regions are linked.
The tremor caused several buildings to collapse, burying people in the wreckage.
A report from England's Oil and Gas Authority has caused the government to call for a halt to fracking in the country on the basis of new earthquake fears.
"The Garlock Fault has been quiet for a long time. But there's geologic evidence that there have been large earthquakes on it," the lead author of a new study said.
Mild shakes were felt across parts of the Los Angeles area following another earthquake in California in the early hours this morning.
The newly identified natural phenomenon is the result of powerful storms transferring some of the vast amounts of energy that they produce into the Earth's crust.
"We often hear about the potential for large volcanic eruptions of the Yellowstone volcano. However, we rarely focus on the threat of large earthquakes in the region," researcher Jamie Farrell said.
NASA officials have said that the plane was flying as part of a mission to study the effects of fire smoke on air quality.
Earth is not the only place that experiences quakes.
In 1994, a huge 8.2 magnitude earthquake struck Bolivia. Scientists now use data from this quake to provide fascinating insights into Earth's interior.
Seismologists may have to completely change their models for the area based on latest findings.
The latest results could help to improve earthquake forecasting in the short term.
In 1906, a powerful 7.9 magnitude earthquake caused the deaths of up to 3,000 people and destroyed more than 80 percent of the city of San Francisco.
Geologists have identified a new type of fault movement at San Andreas.
"It's so flat and white and boring in every direction but underneath you is a mountain range as big as the Pyrenees."
Hawaii's National Guard has stepped in to help evacuations as authorities fear the lava is not slowing down yet.