The Volcano Adventure Guide: Excellent information and background for anyone wishing to visit active volcanoes safely and enjoyably. The book presents guidelines to visiting 42 different volcanoes around the world.
The Campi Flegrei ("burning fields") or Phlegrean Fields is a large, 13-km-wide nested caldera located under the western outskirts of the citiy of Naples and under the Gulf of Pozzuoli. It contains many volcanic centers (cinder cones, tuff rings, calderas) that have been active during the past 30-40,000 years. The volcanic field has been the site of some extremely violent eruptions in the past, although the few ones that occurred during historic times were small events. Today, there is no sign of imminent reawakening of activity, although there are abundant signs of the presence of a still active magma chamber in the forms of solfataras, warm springs, gas emissions etc. In particular, the Campi Flegrei is infamous for its frequent episodes of major ground deformation in the form of large-scale up- and downlift of the ground (bradisism, see below).
Inflation of the ground by about 10 cm since 1 Jan 2012 (OV / INGV)
A new fumarole vent has been detected recently in the Campi Flegrei in the hydrothermal field of Pisciarelli. The new vent was seen ejecting hot gas as well as geyser-like fountains of water reaching 4-5 meters of height. This will inevitably trigger headlines in the press about the possibility of a volcanic eruption in the area, however, it should be looked at in a context that such phenomena are a normal part of the behavior of (very) active hydrothermal systems such as the Campi Flegrei have. ...more
Since 2006, the maximum temperatures at the Pisciarelli fumaroles have climbed to peak in July 2012, and then oscillated at values near water boiling point. Judging from temperature readings, the Vesuvius Observatory believes that the new vent opened on 23 Jan, when gas temperatures from nearby fumaroles suddenly climbed to values of 98 deg C and then steeply dropped to values oscillating between 75-80°C was recorded. [less]
Measurements of a GPS station in Pozzuoli - during 2012, about 8 cm uplift was measured.
According to a recent report by INGV Naples, the ground deformation of the Campi Flegrei (Phlegraean Fields) near Naples has increased considerably lately. During the last 12 months, the ground in some places near the town of Pozzuoli was uplifted by about 8 cm. ...more
The largest uplift, recorded by GPS devices, occurred during the months of July-August 2012 and since December. The trend appears to be continuing at the moment. Such (sometimes dramatic, totaling up to several meters in a few years) ground uplift and subsidence have been known in the Phlegraean Fields since antiquity and are not a new phenomenon. They can usually be explained by normal pressure, temperature and density variations of the giant hydrothermal system of the Campi Flegrei caldera and may not necessarily indicate an imminent eruption.
Increase of the temperature at a fumarole in the Solfatara
Increase in the proportion of magmatic gases at a fumarole of the Solfatara
Location of recent earthquakes in the Campi Flegrei
A new swarm of earthquakes was recorded under the Phlegean Fields near Naples yesterday (8 Sep). The quakes are related to what is called bradyseismus, a slow periodic ground inflation and deflation, which make the ...more
land of the Phlegraean Fields rise and sink over years. On the morning of 8 September, about 200 earthquakes of magnitude up to 1.6 were detected by the Osservatorio Vesuviano (OV). Its director, Marcello Martini, said that this phenomenon repeats periodically and is linked to the process of deformation of the Phlegraean Fields. [less]
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