The global existence of this feature was confirmed due to analysis of earthquake waves caused by the Great Chilean Earthquake of 1960, but it had been suspected since the 1920's.
The global existence of this feature was confirmed due to analysis of earthquake waves caused by the Great Chilean Earthquake of 1960, but it had been suspected since the 1920's. Its name is a compound that includes the Greek word for ‘weak', due to its high viscosity and high ductility. Seismic waves are believed to move relatively slowly through this layer of the mantle, although it is not to be confused with the Low-Velocity Zone, which does not penetrate as deep. At mid-oceanic ridges, this layer may rise to within a few kilometres of the ocean floor, although the base of this layer is most likely about 700 km in depth. FTP, what is this layer of the upper mantle, which is believed to cause the movement of crustal plates due to the lithosphere floating on its highly ductile surface?
The global existence of this feature was confirmed due to analysis of earthquake waves caused by the Great Chilean Earthquake of 1960, but it had been suspected since the 1920's.
{Asthenosphere}