Anukruti Asked a Question
December 22, 2020 7:02 pmpts 30 pts
at 410km in the upper mantle there is seismic discontinuity.this marks an INCREASE or DECREASE?pleasd look into this 2images
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  • Saurabh shukla
    Also please note that seismic velocity decreases at 100-250 km depth clearly due to partial melting of rocks. This corresponds to the asthenosphere layer.
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    Anukruti
    ok.
  • Rahul kumar Best Answer
    At 440 and 660km discontinuity zone, seismic waves speed increase. See the diagram attached below.
    • cropped4314813782733577492.jpg
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  • Saurabh shukla thankyou
    Well it increases most probably, the first book is wrong..... See this attachment it will help you alot...
    • cropped7798359047333324965.jpg
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