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Based on rapid analyses done in near real-time and in support of scientific advice, I present two cases of prima facie evidence for an earth tide triggering eect on earthquake activity during two volcanic eruption episodes: the first, in relation to large magnitude earthquakes, occurred during August2014 in the 2014 2015 Bararbunga-Holuhruan, Iceland, eruption; and the second concerns the timing of VT strings at the Soufriere Hills Volcano, Montserrat. In both cases, statistical testing of the hypothesis that the timings of the seismic events of interest and vertical earth tide phase were not correlated produced probabilities at or below a 5% significance level, suggesting rejection of the hypothesis can be argued. This note outlines the method used for computing earth tide amplitudes at the two volcanoes and the basis and results of the Schuster test for relative phase timings; some comments on the volcanological contexts are added. These findings suggest that further, more formal analysis may be warranted.

Volcano Statistics Casebook: Tentative evidence from two real-time analyses for an Earth tide influence on volcano-seismic events