Low volatility according to what measure? I don't keep up with the literature anymore, since around 2010/2011, but it'd surprise me if we entered some new regim

Low volatility according to what measure? I don't keep up with the literature anymore, since around 2010/2011, but it'd surprise me if we entered some new regime. Googling for "flash crash" turns up many more examples than just the one you mentioned from 2010.