Pumping fluid into one side of the drill pipe/annulus flow system with the other side closed to allow no outflow.
Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards
Lateral movement of weak soil between the spudcan base and an underlying stronger layer, or of weak soil between two stronger layers.
Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards