For western US trained geoscientists, the Bishop Tuff [1] (from the ~750,000 years ago eruption of the Long Valley Caldera, near Mammoth Mtn. in California) is a "modern" comparable ashfall deposit.
This was quite a bit larger (edited to add: I meant in areal extent, not necc. volume erupted).
This was quite a bit larger (edited to add: I meant in areal extent, not necc. volume erupted).
[1] https://en.wikipedia.org/wiki/Bishop_Tuff