Lehmann discontinuity
id:
lehmann-discontinuity-174-11409923
title:
Lehmann discontinuity
text:
The Lehmann discontinuity is an abrupt increase of P-wave and S-wave velocities at the depth of 220 km (140 mi) in Earth's mantle, discovered by seismologist Inge Lehmann. The thickness is 220 km. It appears beneath continents, but not usually beneath oceans, and does not readily appear in globally averaged studies. Several explanations have been proposed: a lower limit to the pliable asthenosphere, a phase transition, and most plausibly, depth variation in the shear wave anisotropy.
brand slug:
wiki
category slug:
encyclopedia
description:
Lehmann discontinuity is a layer separating outer core from inner core.
original url:
https://en.wikipedia.org/wiki/Lehmann_discontinuity
date created:
2005-11-03T03:02:01Z
date modified:
2024-09-02T19:51:50Z
main entity:
{"identifier":"Q656836","url":"https://www.wikidata.org/entity/Q656836"}
image:
{"content_url":"https://upload.wikimedia.org/wikipedia/commons/0/07/S-wave_velocity.PNG","width":1004,"height":938}
fields total:
13
integrity:
16