The weather administration said people should be on alert for aftershocks between 5.5 and 6.0 in the coming day.

The quakes come as California sees the effects of an atmospheric river that has caused flash flooding, rescues, and landslides.

Earthquakes of magnitude 4.0-4.9 are considered “light.” Such quakes off the Oregon coast are common. At least five, spanning in magnitude from 3.0 to 4.5, have occurred near that fracture zone since Nov. 29, according to this real time earthquake map from The Oregonian/OregonLive.

Japan's Prime Minister Sanae Takaichi said the government set up an emergency task force to urgently assess the extent of damage.

At least 33 people were injured after a powerful 7.5 magnitude earthquake on Monday. The quake was followed by a series of smaller tremors. Japan's Meteorological Agency has issued an alert for a potential 'megaquake'.

A massive 7.2-magnitude earthquake struck off northern Japan on Monday, December 8. The powerful earthquake prompted a tsunami alert, according to the Japan Meteorological Agency (JMA).

Japan’s weather agency has issued its highest-level warning that a megaquake could follow Monday’s 7.5-magnitude tremor.Authorities urged anyone living near the Pacific coast to remain vigilant throughout the coming week and to prepare evacuation plans in case they need to flee their homes.

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Japan is among the most earthquake-prone nations in the world, due to its location along the volatile Pacific Ring of Fire.