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Crust 6340 ~ 6370 km Mantle 2998 ~ 6340 km Core 1250 ~ 2998 km

Crust 6340 ~ 6370 km Mantle 2998 ~ 6340 km Core 1250 ~ 2998 km Inner Core 0 ~ 1250 km. Forward Branch. Backward Branch. Forward Branch. Shadow Zone. Forward Branch. Backward Branch. PcP. Shadow Zone. 1912 Gutenberg が shadow zone を 105 o ～ 143 o にみつける

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Crust 6340 ~ 6370 km Mantle 2998 ~ 6340 km Core 1250 ~ 2998 km

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  1. Crust 6340 ~ 6370 km Mantle 2998 ~ 6340 km Core 1250 ~ 2998 km Inner Core 0 ~ 1250 km

  2. Forward Branch Backward Branch

  3. Forward Branch Shadow Zone Forward Branch Backward Branch

  4. PcP Shadow Zone 1912 Gutenberg がshadow zoneを105o～ 143oにみつける 1939 JeffreysがPcPから核の深さを2898 kmに推定 Backward Branch Forward Branch PKP Forward Branch PcP Shadow Zone P Forward Branch Forward Branch Backward Branch

  5. PKIKP 内核を通る地震波 Shadow Zone

  6. Backward Branch PKP PKIKP Shadow Zone PcP P Forward Branch Lehman (1935)　内核を発見

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