A gravity and magnetic study of the volcanic island of Ischia, Naples (Italy) |
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| Authors: | C Nunziata A Rapolla |
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| Abstract: | Gravity and magnetic data for the volcanic island of Ischia, Naples, Italy, have been analyzed and interpreted in light of recent geological and volcanological data to define a model of the island's shallow and deep structures. From the interpretation of the gravity data it appears that the shallow structures consist of pyroclastic material (p=2.0 g/cm3). Within these pyroclastics there are domes and lava flows of higher density and eruptive centres filled with lower density material. The basement is a “horst” with the shallowest depth at about 1.0 km, south of the centre of the island, if we assign a density contrast of 0.5 g/cm3 relative to the above pyroclastics.Interpretation of magnetic data measured at 725 stations showed that the basement derived from the gravity interpretation is magnetized. Moreover, this basement is less magnetized on the western side of Ischia which may be caused by the anomalous thermal state of the area, as indicated by surface fumaroles, hot springs etc. and temperature measurements in deep drillings. |
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