The Sunday edition of Il Mattino will include a free eight-page supplement dedicated to Campi Flegrei, according to the newspaper's announcement.

The supplement's stated editorial scope covers archaeology and volcanoes, the sea and agriculture, culture, wine, and cuisine — a portrait of the Phlegraean area across landscape, heritage, and local production.

The announcement also frames the America's Cup as a possible international showcase for the area. It quotes Naples Chamber of Commerce president Ciro Fiola on the importance of making that opportunity long-term rather than limited to the event itself.

The article does not give the supplement's full contents, contributors, or distribution details beyond its free release with the Sunday paper, nor does it state whether any America's Cup-linked development proposal has been formally approved or funded.

A volcanic system under observation

For readers picking up the supplement, the science behind Campi Flegrei provides useful context. The National Institute of Geophysics and Volcanology (INGV) describes Campi Flegrei as a volcanic caldera and monogenic-cone system characterized by hydrothermal emissions, ground deformation, and seismicity.

INGV identifies the last eruption in 1538, which produced Monte Nuovo. It describes the current period as an ongoing bradyseismic phase that began in 2005.

By April 2025, INGV reported approximately 144 centimetres of uplift. The alert level for the area has been yellow since 2012.

What two decades of seismicity show

A second reader-value addition comes from INGV's analysis of seismicity from 2000 to 2023. The study found that earthquakes occurred mainly in swarms, with an average duration of about one day.

The same study detected expansion of fracture zones in the western part of the caldera, at roughly 3,000 metres below sea level.

Those findings do not independently confirm the supplement's editorial framing or its connection to the America's Cup. They do explain why archaeology, volcanoes, and the sea sit naturally side by side in a publication about this part of the Naples metropolitan area: ground movement and seismic activity are part of its present, not only its geological past.