Respuesta :
The low-velocity zone (lvz), found 100 to 200 km beneath ocean crust, represents conditions where mantle peridotite partially melts and fills voids between grains.
What is low-velocity zone?
In the upper mantle, a region known as the low-velocity zone (LVZ) is found near to the lithosphere-asthenosphere transition. It is distinguished from the surrounding depth intervals by an abnormally low seismic shear wave velocity. Additionally, an anomalously high electrical conductivity ranges along with these depths. Approximately 80 to 300 kilometres of depth is where it can be found. For S waves, it seems to be always present, however for P waves, it might not be in some places. The core-mantle border contains a thin, 50 km-thick layer that contains a second low-velocity zone, which is more often known as the ULVZ. The formation of the Earth's crust and the effects of these LVZs on plate tectonics may both be significant.
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