At Campi Flegrei no ground acceleration
The earthquake in Campi Flegrei on June 30, with its epicenter in the Bacoli area, was the strongest in the last 40 years together with the one on March 13, 2025 : it recorded the same magnitude , equal to 4.6 , but having occurred at a greater depth (4-5 kilometers), it caused less shaking of the ground and more limited effects, says the director of the Vesuvius Observatory, Mauro Antonio Di Vito. The first data collected demonstrate that in the area hit by the earthquake " there is no acceleration of the ground , which always moves at the same speed , and the geochemical parameters (such as the temperature of the fumarole and the concentration of carbon dioxide in the air ) have not changed compared to the past few weeks: this means that the process in progress continues as in recent months , without any particular news". At the origin of the phenomenon there is once again "the uplift of the ground at Campi Flegrei, which continues to rise by 15 millimeters per month as in the past months generating these earthquakes at the edges of the uplifted area ", specifies the expert. "The data from the Gnss network indicate that the crustal deformation continues with the same trend since April 2025, with a speed that registers the maximum value in the Terra district". Earthquakes that occur in the gulf area , like the one on June 30, have the peculiarity of generally being " deeper and therefore, even when the magnitudes are high, they generate a slightly lower ground shaking . On June 30, the shaking recorded was relatively low , less than 10% of the gravitational acceleration, with the maximum values recorded by the accelerometric stations of the Terra district, Bacoli and Monte Procida. The other shock of magnitude 4.6 recorded on March 13, 2025 was more superficial and caused a greater shaking ." Less shaking means less effects, even if on June 30 there were small landslides in Bacoli in the Punta Pennata area, where a team from the INGV is carrying out surveys, while tomorrow other experts from the institute will be at Solfatara. Broadening the view to the more general situation of the Campi Flegrei in recent years , Di Vito continues, we can see "an increase in the frequency and magnitude of earthquakes and an increase in degassing : just think that from 2005 to today we have reached 5,000 tons of carbon dioxide emitted per day , a very high value that we have reached progressively. It is all connected: there is a deep system that is heating up and pressurizing and that is the engine of this process ".
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