Quote:
Originally Posted by bartman
This still intrigues me Carl, and I'm not sure if I should proceed in this post. but any hooo......
So, if for instance, the recent quake in QLD might move the magma/mantle plume slightly and could possibly have shifted some of the intrusive rocks to allow a crack/ subsidence and then allow the dormant 'volcano' to re-activate.......
by allowing magma to seep through those cracks and weaken the fissures,
Once again I should probably post this in a new tread.....
Bartman
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No, the plume is at quite a depth....40-50kms or more below the surface. It's usually smaller blobs coming off the top of the plume that act as the direct magma sources for the volcanoes. It's the plate on which Australia sits that moves over the plumes (mantle plumes are usually stationary) and so you get a chain of volcanoes that forms as the plate moves over the plume. However, if the plate cracks to depth, there might be a slight chance for a new eruptive episode to occur over the top of the plume. Although, it also depends on if the plume itself is still there. They do eventually disappear over time.