So what is the caldera collapses? Minor Tsunami and the east coast would get a few ripples in the water.
The Calcdera would have to entirely collapse allowing mountains of saltwater into an immense cavity to cause any kind of explosion worth a damn. The physics and size of this eruption just do not equate to that happening. There has to be a substantial chamber exposed for the fireworks we dream of.
Imagine you (assume 180) pounds are the Tambora 1815 Eruption and your weight equals the volume of material thrown out by that monster. La Palma to date has through out the amount equal to 2 tablespoons of water.
If you were the Tambora eruption 74ka ago, and your weight equaled that eruption, La Palma has thrown out 1/4 of a teaspoon.
I love doom and gloom (honestly) but the only scenario that even slightly bothers me is an impact event - simply because we do not have full monitoring of the sky and despite one thinking we see everything, the reality is I think only a few bolides have ever been detected BEFORE entering Earth's atmosphere - in other words we are likely going to get little warning at all and we right now have our pants down waiting to get caught.
And we just do not have the funds or willingness to develop a means to stop one of these large bolides from impacting; despite it being within 99% degree fo certainty as absolutely happening within a reasonable amount of time.
If we ver get words of a NEO with a degree of probability of impact I will certainly turn into a proper, no doubt about that.