IIT JAM
Anukruti Asked a Question
December 22, 2020 7:02 pmpts 30 pts
  • IIT JAM
  • Geology (GG)

Question below

at 410km in the upper mantle there is seismic discontinuity.this marks an INCREASE or DECREASE?pleasd look into this 2images
  • 2 Answer(s)
Answer Now
  • like-1
  • like-1
  • 2 Likes
  • 3 Comments
  • Shares
  • 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.
    Likes(1) Reply(1)
    Anukruti
    ok.
  • Rahul kumar Best Answer
    At 440 and 660km discontinuity zone, seismic waves speed increase. See the diagram attached below.
    • cropped4314813782733577492.jpg
    Likes(1) Reply(0)
  • Saurabh shukla thankyou
    Well it increases most probably, the first book is wrong..... See this attachment it will help you alot...
    • cropped7798359047333324965.jpg
    Likes(1) Reply(0)