Lehmann discontinuity
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The Lehmann discontinuity is an abrupt increase of P-wave and S-wave velocities at the depth of 220±30 km, discovered by seismologist Inge Lehmann.[2] It appears beneath continents, but not usually beneath oceans,[3] and does not readily appear in globally averaged studies. Several explanations have been proposed: a lower limit to the pliable asthenosphere, a phase transition,[4] and most plausibly, depth variation in the shear wave anisotropy.[5] Further discussion of the Lehmann discontinuity can be found in the book Deformation of Earth Materials by Shun-ichirō Karato.[6]
Notes
- ↑ Figure patterned after Lua error in package.lua at line 80: module 'strict' not found.; Original figure attributed to Grand and Helmberger (1984)
- ↑ The thickness is 220 km. Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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General references
- Lua error in package.lua at line 80: module 'strict' not found. – some historic background.
External links
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