Yield Point 2 : Natural Disaster. In drilling-fluid terminology, yield point means yield value (see Yield Value). Of the two terms, yield point is by far the mostly commonly used expression. (Bul D11)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}