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Mean directions of magnetization from Mounts Arso Ischia Island, Gulf of Naples , Etna and Vesuvius lava flows have been determined based on very stringent linearity criteria. This curve enables a reassessment of the age of eruption of several lavas. It is also demonstrated that two Etna lava flows, which, according to the literature, were emplaced in AD and respectively, were actually both emplaced around AD The same time window also holds for a Vesuvius lava flow for which only an upper time threshold was previously available. Only one of the studied flows needs further sampling and analysis to verify whether this flow has been affected by a complete remagnetization or has an erroneous historical dating . The applied procedure seems to be the most appropriate one in carrying out palaeomagnetic surveys of lava flows, as also suggested by the broad agreement with some 17th and 19th century measurements of the geomagnetic field in Rome, relocated to Etna, and is likely to improve knowledge of past history of a volcano significantly. The pioneering work of David and Chevallier draws attention to lavas as potential recorders of past directions of Earth’s Magnetic Field EMF. This is particularly useful in Italy where historical measurements of EMF are rare e.
