The 'Big One' earthquake is usually associated with California.
But scientists have warned that it could strike in New Zealand – after finding an active fault line running through the country.
Named the Mangatangi Fault, the fault line runs alongside the Hunua Ranges in South Auckland, close to the city of Auckland.
In their study, a team from the University of Auckland used radiocarbon dating to understand when – if at all – the fault last moved.
Their analysis revealed that the fault line last ruptured around 10,000 years ago, which means it's classed as 'active'.
