It is north of the island Anafi, and southwest of Amorgos.

[1] The island hosts a seismometer, part of the Greek national network, installed in 2025.

An earthquake fault located near Anydros was the source of the 1956 Amorgos earthquake that registered 7.6 on the Richter scale and caused widespread damage on Amorgos and the island of Santorini, where dozens died.

[3] There were hundreds of minor earthquakes of up to magnitude 5 in an area around Anydros at the beginning of February 2025, causing concern in Santorini and causing more than half the population to leave the island.

The seismic activity was attributed to tectonic plate movements rather than volcanicism, and it was thought that it could last weeks.