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Vaibhav Singh posted an Question
June 10, 2021 • 04:07 am 30 points
  • IIT JAM
  • Geology (GG)

27. the low velocity zone apart from reduced seismic velocities is also characterized by: a) low heat flow b) low heat flow and high electrical conductivity c)

27. The Low Velocity Zone apart from reduced seismic velocities is also characterized by: a) Low heat flow b) Low heat flow and high electrical conductivity c) High beat flow and high electrical conductivity d) High heat flow and low electrical conductivity. NEXT QUESTION. 28. The Low Velocity Zone (LVZ) is NOT poorly developed in the regions of: a) Shield areas b) Platforms c) Marine Trenches d) Mid-oceanic Ridges is

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    Saurabh 1 Best Answer

    28) Correct option should be (D), cuz that's where the width of the LVZ is found to be maximum.Well it's a known fact that 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 penetration 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 poorly defined LVZ . Beneath Archean shields, geotherms do not intersect the mantle solidus, and hence there is no LVZ. So what we get from above is that, LVZ is best developed in Ridges and poorly developed in platforms and almost negligible in case of archean shields.

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