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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Geology (GG)
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Sajan sarthak Best Answer
The low-velocity zone (LVZ) occurs close to the boundary between the lithosphere and the asthenosphere in the upper mantle. It is characterized by unusually low seismic shear wave velocity compared to the surrounding depth intervals. .. The question asks about the well developed region.,it is definitely the MID OCEAN RIDGE due to the high partial melting.
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Saurabh 1![best-answer]()
Correct answer has to be (D) Mid oceanic ridges. LVZ is usually found at a depth of around 100-250 km and it is succeeded by Lehmann discontinuity. The width or even the existence of the LVZ depends on the steepness of the geotherms. With steep geotherms like those characteristic of ocean ridges and continental rifts, the range of deepening or intrusion of the mantle solidus is large, and hence the LVZ should be relatively wide .The gentle geotherms in continental platforms, which show a narrow range of intersection with the hydrated mantle solidus, produce a thin or not well developed LVZ . Beneath Archean shields, geotherms do not intersect the mantle solidus, and hence there is no LVZ.