The index, developed with the Cambridge Centre for Risk Studies, looks at economic exposure of 301 leading cities around the world to 18 specific threats, including natural catastrophe and manmade events.
Where we found that 70 percent of total GDP at risk across the cities is associated with emerging economies, with cities often highly exposed to single natural catastrophes.
But by far the biggest threat to those cities is a market crash, which could wipe out $1.05tn of GDP from the cities combined, followed by human pandemic, wind storm, earthquake and flood.
The City Risk Index is designed to stimulate further discussions between insurers, governments and businesses on the need to improve resilience, mitigate risk and protect infrastructure.
The index can be viewed here.