The Earth's Shifting Crust by Charles Hapgood - wire of information

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EARTH'S SHIFTING CRUST
their direct and indirect effects in Asia as in North America,
and, indeed, everywhere. The effect o volcanic dust, as we
have seen, is to chill the atmosphere. In the last chapter I
presented indirect evidence that the volcanism during the
displacement was at times massive enough to produce major
lowering of the average temperature, and continuous enough
to keep it low for long periods. In addition, I presented di-
rect evidence that many volcanoes were active during the
period in areas that are now quiet.
I can form no idea as to just how many volcanoes might
have been active simultaneously at any time during that dis-
placement of the crust. An educated guess is apparently not
possible. I will assume, however, that during any displacement
the average quantity of volcanism annually would be
considerably greater than at present.
sumption.
This seems a safe as-
I will assume, secondly, that at intervals during the 10,000-
year period of the displacement, volcanism would reach a
higher point than the average for the whole period. This has
already been suggested (Chapter VII). Such periods would be
likely to occur while the crust was moving at its greatest speed,
that is, during the middle part of the period (Chapter XI).
These would be periods of readvance of the dwindling continental
icecap. They would be of varying length, but some
of them would last a long time.
My third supposition will be that occasionally, during
periods of very active volcanism, there would occur a conjunction
of several major volcanic explosions in the same
year. The mathematical probabilities would favor this occurrence.
It would be strange indeed, considering the stresses
and strains to which the crust of the earth would be subjected
during its displacement, if this did not happen now
and then.
Let us now look at the consequences of this. Let us suppose
five explosions in one year of the magnitude of the
explosion of Mt. Katmai (or a larger number of lesser ex-
plosions). According to Humphreys, this would produce