Right, and also, let's not forget rifting of intercontinental plates and hotspots... but although we have a proposed failed rift in the mid-Mississippi River Valley that can produce large quakes in my area, there will be no volcanism, nor effects of volcanism from somewhere distant. Paleo folks have uncovered the remnants of volcanism in Arkansas and the layer of ash it produced, and also the tiny Unaka Mountains tucked onto the eastern edge of the Great Smoky Mountains, but they are long extinct. In fact, the lava produced in the small volcanoes in east Tennessee have undergone metamorphism and only the trained eye could identify the traces of volcanism that occurred during the formation of Pangea.
Perhaps you could look into the earth history of your area and find if volcanism was a part of its distant past? Thanks for asking your question, and hopefully our rock specialists here will help you with your first question.
Lin
On Wed, Nov 24, 2010 at 3:53 AM, Jim & Shellie Van Winkle <the.vanwinkles@verizon.net> wrote:
I'm no expert, but as for #2, roughly speaking, volcanoes are the result of plate movement and subduction and the melting of the subducted oceanic plate and any overlying continental plate. Earthquakes are also the result of fault movements, and fault movements are the result of plate movements. Volcanoes will result in earthquakes in their general area, but not globally.
Jim Van Winkle
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