Tephra is fragmental material produced by a volcanic eruption regardless of composition, fragment size, or emplacement mechanism.
The Volcanic Explosivity Index (VEI) is a scale that describes the size of explosive volcanic eruptions based on magnitude and intensity. The numerical scale (from 0 to 8) is a logarithmic
scale, and is generally analogous to the Richter and other magnitude scales for the size of earthquakes.
However, when the
This suggests a great stock market collapse and another great depression in or about the year 2023.
If volcanism is, in long-term, increasing (as hypothesized), wars and depressions might attenuate the rise, but the longer these last, the higher may be the increase in volcanism afterwards.
The volcanic ejecta needs to reach the stratosphere for a significant cooling effect. As the troposphere warms it expands in height, making it harder for particles ejected in smaller eruptions
to reach the stratosphere.
Therefore, generally, smaller eruptions might be decreasing with the appearance of ultra-massive eruptions (due to long-term warming effect).
However, in case of major extinctions (when at least some life should be, per
the hypothesis, migrating
towards the mantle within a relatively short time-frame) this decrease is probably unlikely.
If volcanism is highly correlated with human activity, how about earthquakes? Should we interpret the human production of earthquakes as non-natural, or simply as another part of the forces acting
on the planet? If we would stop causing earthquakes, would the earthquakes of that magnitude continue anyway, by some other mechanism? I wouldn't be surprised.