[two_handfuls]

My guess:

There were 20 real earthquakes and the AI issued 14 warnings. 20*70/100 = 14.

Of course the problem with that is that it’s always a balance between precision and recall (or specificity vs sensitivity).

Here they show 70% recall which sounds good, but the precision is 14/(14+8)=64% which is decidedly less impressive.

Those terms are defined in Wikipedia here: https://en.m.wikipedia.org/wiki/Precision_and_recall