Authorities had evacuated the nearly 4,000 inhabitants of the fishing town of Grindavik last month over fears of eruption.
A 4.2 magnitude earthquake struck the area early on Wednesday, the strongest jolt in 40 years to rattle the volcanic field, known as the Campi Flegrei.
The eruption was preceded by a period of strong seismicity and "rapid uplift" of the summit.
Mount Etna has not erupted since 1992, now its lava and ash are diverting planes at the peak of Italy's holiday season.
Scientists have found the main driving force behind the generation and eruption of diamond-rich magma, which can also help find more.
Comet 12P/Pons-Brooks is a cryovolcanic comet that orbits the Sun every 71 years. After a possible volcanic eruption, it now has what seems to be two massive horns.
Keep an eye out for volcanic ash (tuf) and even some fossils that froze in the ancient marine rocks. The fossils provide a glimpse of sea life in the long book of life on Earth.
Granite formation on the Earth is generally helped by the presence of water and the influence of plate tectonics, both of which are absent on the moon.
The aim of the experiment was to provide insight into the age-old debate regarding whether one can sink into lava.
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