Running from #Vietnam and into #Yunnan, the Red River Fault is one of the major tectonic features of SE Asia. We take a controversial look at its significance ... and the film follows directly on from "extrusion tectonics".... Part of a series of films scheduled to coincide with Series 4 of Race Across the World #RATW and part of The Shear Zone channel. #geology #tectonics #faultline #earthquakes