September 16, 2013. After analyzing its "discovery" in the study of seismic wave propagation, when one of the earthquakes, scientists have come to the conclusion that it is an ancient stream of magma moving underground from west to east across the continent for over 150 million years of existence of the globe, and identified the depth of the magma stay below the crust: it is about 200 kilometers. For their study, the researchers constructed a three-dimensional model of the Earth's interior under the United States and Canada, using data from seismic vibrations fix the surface of the Earth after an earthquake in Virginia, August 23, 2011. By comparing the obtained information from different places, scientists have noticed that in different directions seismic waves passed in different ways, as if they were passing through areas with different physical properties.
Drifting underground hot spot at different times imposes different imprints on the continent: for example, the imposition of continental drift on the motion of the mantle has led to the fact that the hot region, the former about 100 million years, at about a South Dakota (ie the middle of the continent) with time shifted to the east . Upon reaching the northern part of Virginia, the trajectory of the hot spot has changed, and it was slowly drifting to the north-east, having gone up in a bottom of the Atlantic Ocean.
Through the analysis of seismic waves, which today is one of the main research methods subsurface at depths greater than 10 kilometers, the scientists made differently to revise ideas about volcanic eruptions. Published in the summer of 2013 to review the work have made representations as a possible speed of the magma, and the timing of the existence of hot magma reservoirs beneath dormant volcanoes. Researchers presented their theory in a scientific treatise, published in the summer of 2013, which could see anyone who are interested in the works of scholars.