Back-arc basins and slabs: Ring of Fire - tectonic journeys in E Asia
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- čas přidán 21. 07. 2024
- This tells the story of the Sea of Japan - how it may have opened in response to Earth processes deep in the mantle below. Together we can find out how imaging techniques are revolutionising our understanding of plate tectonics - showing subduction zones in greater clarity. This short film is part of a series that tells geological stories accompanying (but independent of) the BBC's series Race Across the World.
#RATW #tectonics # Japan #earthquakes #geology #ringoffire
Brain-storming video. Thanks respected Prof. Rob Butler for explaining complex tectonic phenomenon in such a simple way.
Just found your channel and enjoy learning from your videos.
Welcome! there are a bunch to go at on The Shear Zone - hope you enjoy them...
It seems like that the cool plate subducted into and cut an earlier warmer mantle plume unit from the seismic picture. Whether the relationship is true or faulse?
Great video!! Curious about why some subducted slab can penetrate through the mtz.
Can you please make a video on how evolution of Himalayas pushed tibet and Indo-burmese arc, andaman Nicobar out of earth
Next week on Ring of Fire!!
Thankyou Prof. Butler for making such nicely explained videos on Himalayas and Red river fault. Those video clear so many doubts, Actually the Indian plate subduct in. Two direction, one in north under Eurasian/tibetan and one in east under burmese micro plate. Hence I wanted to make a request that can you please make a video on eastern Himalayan syntaxis that why the myanmar itself and the major basins like Assam Arakan (Surma basin) has western convex arch, as if something is pushing them into west whereas subduction is going on east. It's bit confusing
Very helpful. With back-arc basins, what governns the switch from extension, back to compression, as is now happening in the sea of Japan?
Good question! The reason might lie in how the subducted slab interacts with the mantle transition zone... as introduced in the film .... though the situation is 3D - so reasons may lie in slab processes adjacent to Japan....
Why does the arc migrate to the right thining out the crust?
As the slab rolls back it takes the arc with it - so the back arc must stretch...One reason for the slab hinge rolling oceanward is that at depth the subducted slab "ponds" against the mantle transition zone....
need to explain more in depth/clearly the backwards and forwards and penetration of perovskite , , ie why penetration beyond 600 km? or not ? why backward and forward motion ? - a semi-mystified retired geophysicist
more coming on subducting slabs in coming videos!
The one part, a subdued plate bounces on the 2nd layer is ok,
but I am still curous what force can pull the Japanese Area against the in moving Pacific Plate ... if Asia itself is not moving ...
The general idea is that the motor for plate tectonics is slab pull. It can drag down the subducting plate but if the hinge of the subduction zone rolls back, then the over-riding plate (volcanic arc) moigrates with it, causing the area behind to rift (back arc basin). Mainland Asia "pushing" Japan wouldn't generate the rifting of the back arc artea (Sea of Japan)... Incidentally - it's the same reason I think the extrusion of Tibet (see film) is IMO an unlikely driver for basin formation further out in SE Asia... Thanks for the question.
@@robbutler2095 Thanks ...we will see, or better the humans after us, if ...