Volcanic Hotspot Hidden Under Eastern U.S.
The rectangular boxes show the locations of the seismic anomalies detected by USArray.
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“Geologist [I'm Climate Change]”
Since: Mar 07
#1 Sep 16, 2013
Seems from the map that the hotspot has drifted off the NE.coast.
For hotspot hunting it is probably better to use an ROV for grab samples of new material. May find a small oceanic seamount with relatively recent age to add to the smithsonian's list of volcanoes (when they finally get their newly redesigned website in working order).
The hotspot track incidentally may be part of the reason for the uplift of the N. Appalachian chain (heated up base of crust), and has had a fair chunk of cold near surface rock planed off by valley glaciers. This is probably why the Smithsonian is located above sea level.
For compression quakes in the area look for Cascadia subduction zone; radial outflow from Raton-Clayton, Yellowstone, & Chilcotin hotspots in the over ridden Farallon spreading centre rift, and also the Mexican backarc basin which is in the late stage of recompression.
Of interest is the occasional volcanism @ the hotspot. The magma produced will pond @ the base of the crust most of the time & differentiate in situ. Most of it will crystallise @ the base of the crust where the crust is thinnest, with a slight swell over the hotspot magma pool & a minor unconformity above. Magmatic eruption from low production rate hotspots will only occur through pre existing tectonic features reaching to the base of the crust (hence the diamondiferous volcano). As a result of migration to the highpoint @ the base of the crust, the magma pool may be well away from the plume head producing the magma.
Will look on the future posts on this hotspot trail with interest. looks a mite smaller than Raton-Clayton, but is similar to the hotspots producing random seamount clusters & chains in the pacific.
Have a nice day: Ag
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