Cassini Day: Advancing Tsunami Early Warning with GNSS Ionospheric Monitoring

The Rome 2026 event opened on 22 June 2026 at Sapienza University, Rome with the Cassini Day, a conference held within the Cassini Programme supporting Italian–French scientific collaboration. The day brought together specialists in tsunami early warning, GNSS-TEC ionospheric observations, and emerging computational approaches under the theme “Advancing Tsunami Early Warning with GNSS Ionospheric Monitoring.” In addition to French and Italian colleagues, participants from Norway and United Kingdom participated in the event.

More information about the event, programme, and speakers is available on the official event site: 👉 Cassini Day — Advancing Tsunami Early Warning with GNSS Ionospheric Monitoring

The Cassini Day set the stage for the GO-EUREKA Second Workshop (WS2), which followed on 23–25 June.

Topic Highlight: Toward Impact-Based Tsunami Early Warning

A central thread of the day was the push toward impact-based forecasting — moving beyond a simple alert toward rapid, actionable estimates of tsunami consequences. Speakers emphasized that seismic data alone does not capture the full complexity of a rupture, so initial seismic-only metadata is often insufficient for reliable warning. Robust forecasting needs information across the chain: near-field and far-field tsunami sources, co-seismic displacement at the solid surface, and absolute water-height amplitudes.

Looking Ahead

Cassini Day underscored the value of cross-disciplinary, Italian–French collaboration in tackling tsunami early warning, and provided a strong scientific opening for the GO-EUREKA workshop that followed.