@todwest @Catawu Anydros is part of a "half-graben" per the scientific paper I was able to find. This paper specifically reference Anydros as being connected to Kolumbo volcano and magma activity..
"Bohnhoff et al. (2006) analyzed microseismic events that occurred between 2002 and 2004 in the Hellenic Volcanic Arc. The events clustered beneath Kolumbo, along the Santorini Amorgos Fault Zone and spread along a NE–SW trending axis crossing Anydros Island. The cluster beneath Kolumbo is interpreted to be linked to the accumulation of magma below the volcano."
https://www.sciencedirect.com/science/article/abs/pii/S0040195116000597#preview-section-abstract
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