The concentration of microparticles in the 2 164 m long ice core from “Byrd” station Antarctica, varies cyclically. Highest concentrations of 0.65 μm diameter microparticles occur where oxygen-isotope studies show lowest paleotemperatures. The age of the bottom ice estimated from microparticle-concentration variations, assuming an annual cycle, is 27 000 years, much less than from oxygen-isotope studies.

The frequency, intensity, and latitude of occurrence of volcanic eruptions vary systematically within the well‐known tide cycles. This finding is in agreement with the results of previous investigations of earthquake activity, and some eruption activity, like seismic activity, may be related to changes in the length of day. Eruptions are favored in months wherein tidal amplitude is large at the latitude of the volcano. The eruptions of two volcanoes, Pelée and Soufriere (St. Vincent), have occurred in this century only within a very narrow range of values of phase angle between the anomalistic and tropical lunar tides.

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