A crack stretching more than 620 miles across northwestern Canada could one day cause ‘at least’ a 7.5 magnitude earthquake.

Tintina is a fault line – where two of Earth’s puzzle pieces, tectonic plates, meet – which runs from northeastern British Columbia to central Alaska.

Experts have never worried too much about it, believing it has been asleep for about 40million years.

But researchers have revealed in a new study that an 81-mile-long stretch of the fault line in Yukon has been very much awake for 2.6million years.

The study, published in the Geophysical Research Letters, found that the crack has produced multiple strong tremors between a magnitude of three and four, enough to cause minor damage.

Worryingly, whether the fault could cause an even larger tremor isn’t a question of

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