Prince Harry and Meghan Markle’s new Canadian home faces thousands of earthquakes a year and could be hit by a devastating tsunami “at any time”.
The Duke and Duchess of Sussex’s £11m waterfront mansion is near a dangerous fault line responsible for a record magnitude 8.1 quake in 1949.
The last big Vancouver Island earthquake struck in 1946 and measured 7.3 on the Richter scale.
And experts say the Queen Charlotte line has been building up for a similar seismic event which could also trigger a rare “mega-quake” ever since.
Prince Harry, 35, today arrived on the island to begin his new life with his former Suits actress wife, 38 and baby Archie after ditching their life as Royals.
Taimi Mulder, seismologist at the Geological Survey of Canada, said the area’s last “megathrust earthquake” was recorded around 300 years ago and triggered a devastating tsunami that was felt in Japan.
He said the natural phenomena happens once every 200 to 800 years and could be triggered by other tremors.
Mr Mulder said: “An earthquake is like ringing a bell. The earthquake is the clapper that sets it off and the bell reverberates.
“In an earthquake, energy is sent shooting in all directions and it pings around inside the earth making the whole earth vibrate.”
A string of offshore quakes measuring up to 6.4 left buildings swaying in the northern part of Vancouver Island over Christmas.
Another tremor measuring around 4.0 was recorded in the area on Monday.
A spokesman for the City of Vancouver said: “Here in Vancouver, we are near the boundary of two of these plates, the North American Plate, on which we live, and the smaller Juan de Fuca Plate.
"Some of the world’s largest earthquakes have occurred here in British Canada.
“Our best research shows that these catastrophic earthquakes will occur again and can happen at any time.
“In fact, our area is home to thousands of small earthquakes every year.”
The fault line has three quake zones including one that creates rare magnitude 9.0 “megathrust earthquakes” and tsunamis that reach Japan.
The spokesman said: “This zone produces massive earthquakes, called ‘megathrust earthquakes,’ which may register as large as magnitude 9.0 earthquakes.
“The last earthquake in this zone, in 1700, was recorded by First Nations historical accounts and geological records, telling us that it was massive and caused a tsunami that impacted coastlines as far away as Japan.”
The record 1946 Vancouver Island quake was created by another type called “shallow crustal earthquake”.
The spokesman said: “These earthquakes are far more frequent, highly damaging, shallow crustal earthquakes are near the surface and do not occur on plate boundaries.
“These earthquakes, such as the damaging 1946 Vancouver Island earthquake, occur closer to Vancouver and pose a very high risk to our city.”
A third kind called “deep instraslab” is as frequent but generally less damaging.