More seismic activity along the Pacific Ring of Fire has seen strong earthquakes strike Alaska, Japan, Chili, the west coast of the US, Papua New Guinea, Mexico, Indonesia and Hawaii.
They are all situated along the feared Ring of Fire, which is the largest and most active fault line in the world.
Davie Galloway, a seismologist for the British Geological Survey (BGS), told Express.co.uk that following the most powerful quake near Alaska, there will be a stream of aftershocks that could have a similar impact.
Mr Galloway said: “Aftershocks can happen for days and we can expect to see some in the coming days, especially after the big one near Alaska.”
The Ring of Fire is “where all the plates meet and they are constantly rubbing against each other”, said Mr Galloway.
It stretches from New Zealand, all around the east coast of Asia, over to Canada and the USA and all the way down to the southern tip of South America.
Now, even more earthquakes have hit the region.
San Diego, California, was hit by a 4.1 magnitude quake at 10.10 GMT this morning, just days after another huge quake hit Alaska.
Tremors were felt in San Diego and the Los Angeles area, affecting up to 10 million people.
Shortly after this, at 10.41 GMT, a powerful 5.7 magnitude tremor struck off the coast of Fiji.
No tsunami warnings were issued.
Alaska and parts of western Canada braced for a possible tsunami on Tuesday after a magnitude 7.9 earthquake struck the Gulf of Alaska, sparking evacuations in coastal Alaska and a tsunami warning for California that was later lifted.
There were no immediate reports of injuries or damage from the quake, which was initially measured at magnitude 8.2.
Earthquakes of similar magnitude are not uncommon in Alaska, which is seismically active.
The state has recorded 11 tremors with a magnitude of 7 or greater within 373 miles of Tuesday’s quake over the past century, according to Zachary Reeves, a USGS seismologist in Golden, Colorado.
The largest US earthquake ever recorded was a magnitude-9.2 in Alaska in March 1964, causing tidal waves of more than 100 feet high that killed 131 people.