# Lehmann discontinuity

> abrupt increase of P-wave and S-wave velocities at the depth of 220±30 km

**Wikidata**: [Q656836](https://www.wikidata.org/wiki/Q656836)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Lehmann_discontinuity)  
**Source**: https://4ort.xyz/entity/lehmann-discontinuity


## References

1. Freebase Data Dumps. 2013