http://www.earthfiles.com/news.php?ID=2101&category=Science [Audio file just below map of Dakota] No figures on frequencies involved- but this report seems to have good credentials. Describes infrasound effects through to upper atmosphere from Earths' core. Scroll down to the bottom of the report to see this comment: The *Earth* at *depth* is a *very mysterious place*. When the geophysicst is *saying* it ( *infrasound frequency*) *goes* from the *core*, *transmits through* the *mantle* to the *crust*, is *able* to *exit* that, *get all*the *way up* to the *ionosphere* and *perhaps get reflected back down* - if these *frequencies* are *very* low Obviously, room for a lot of sidebands , reflections and sympathetic oscillations from deep down in a very powerful energy source- our metallic core.
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