More than 20 earthquakes have hit central and southeast Asia in the last 24 hours, with one of the most powerful in 75 years in Myanmar.

Geologist Robert Yeats, author of 'Earthquake Time Bombs', has highlighted the risks associated with the presence of several large US cities in the Pacific Northwest's Cascadia subduction zone.

A powerful earthquake rocked Myanmar and Thailand on Friday, killing multiple people and collapsing buildings across both countries.