What's the strongest shaking ever felt by people?
We all know that magnitude doesn't exactly map out 1:1 to intensity and there are so many factors influencing how strong of a shaking people on the ground actually feel, such as depth of hypocentre, type of soil, type of vibration etc. I was just watching some clips of the earthquake in La Guaira and the peak shaking seemed more powerful than even the earthquakes in Concepción 2010 or Sendai 2011 despite the magnitude being far lower (although those two were a lot longer). People were thrown on the ground and cars nearly flipped sideways. Even in Caracas itself the movement just looked so strong. I am aware that the concept is a bit fuzzy and not necessarily well studied; the Mercalli scale also isn't enough because a moderately intense earthquake can be highly destructive if building standards are poor, and vice versa. So what's (likely) the strongest shaking ever felt by people?