Via Science Daily :

…”As a general rule, I have been anti-drip since my early days as a
scientist,” admits Fouch. “The idea of a lithospheric drip has been
used many times over the years to explain things like volcanism,
surface uplift, surface subsidence, but you could never really confirm
it–and until now no one has caught a drip in the act, so to speak.”…  (research published in Nature Geoscience)