No abstract

No abstract

No abstract

An application of magnetic survey to the submerged Roman ruins of the Bay of Baia, volcanic area of the Phlegrean Fields,Naples (southern Italy) is presented and discussed.The site of Baiae, one of the most extensive submerged archaeological sites knownin Italy, is characterized by urban sites with residential houses, thermal baths, fisheries and harbour buildings.The survey was aimed to establish the typical magnetic signatures of building structures submerged in a volcanic marine environment. The comparison of both the maps of the magnetic anomaly field and of the computed analytic signal with the known submerged archaeological structures of the area gave some interesting insights into the lithological characteristics ofthe archaeological structures ofthe Baiae site and showed the effectiveness of the magnetic method for mapping remnants of building structures beneath the sea bed.

In this paper we present an example of the integration of airborne and marine magnetic data sets measured in the Neapolitan area, southern Italy. The integration involved detailed data measured recently in the Phlegrean Fields, in the Somma-Vesuvis area and in the Bay of Naples, that produced a high-resolution magnetic map of the whole active volcanic district. The data sets partially overlapped and characterized varying flight height and line spacing. Integration was therefore performed through several procedures including continuation between general surfaces. The integration produced a new, detailed, draped magnetic data set of the Neapolitan region characterized by a terrain clearance of 200 m, giving a meaningful overall view of the volcanic area. The study of the main magnetic features of the area was carried out by computing the horizontal gradient of the pole-reduced draped data. The analysis of the obtained map showed the presence of lineaments of preferential magma upwelling and buried volcanic structures and allowed the delineation of a geovolcanological and structural framework of the whole Neapolitan volcanic district.