brittle-ductile boundary

What is brittle-ductile boundary?

brittle-ductile boundary meaning The depth in the crust where the crust changes from being brittle (tending to break) above, to being ductile (tending to bend) below. Most earthquakes occur in the brittle portion of the crust above the brittle-ductile boundary.

 

reference: USGS – Earthquake Glossary