<P> The plan assumes between two weeks and 20 days' notice of an eruption and foresees the emergency evacuation of 600,000 people, almost entirely comprising all those living in the zona rossa ("red zone"), i.e. at greatest risk from pyroclastic flows . The evacuation, by trains, ferries, cars, and buses is planned to take about seven days, and the evacuees will mostly be sent to other parts of the country rather than to safe areas in the local Campania region, and may have to stay away for several months . However, the dilemma that would face those implementing the plan is when to start this massive evacuation, since if it is left too late then thousands could be killed, while if it is started too early then the precursors of the eruption may turn out to have been a false alarm . In 1984, 40,000 people were evacuated from the Campi Flegrei area, another volcanic complex near Naples, but no eruption occurred . </P> <P> Ongoing efforts are being made by the government at various levels (especially of Campania) to reduce the population living in the red zone, by demolishing illegally constructed buildings, establishing a national park around the whole volcano to prevent the future construction of buildings and by offering sufficient financial incentives to people for moving away . One of the underlying goals is to reduce the time needed to evacuate the area, over the next 20 or 30 years, to two or three days . </P> <P> The volcano is closely monitored by the Osservatorio Vesuvio in Naples with extensive networks of seismic and gravimetric stations, a combination of a GPS - based geodetic array and satellite - based synthetic aperture radar to measure ground movement and by local surveys and chemical analyses of gases emitted from fumaroles . All of this is intended to track magma rising underneath the volcano . No magma has been detected within 10 km of the surface, and so the volcano is classified by the Observatory as at a Basic or Green Level . </P> <P> The area around Vesuvius was officially declared a national park on June 5, 1995 . The summit of Vesuvius is open to visitors and there is a small network of paths around the volcano that are maintained by the park authorities on weekends . There is access by road to within 200 metres (660 ft) of the summit (measured vertically), but thereafter access is on foot only . There is a spiral walkway around the volcano from the road to the crater . </P>

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