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ESE–WNW to E–W faults display structures consistent with strike–slip movements.

The activity of these faults developed during Pliocene–Early Pleistocene times. The study area is characterized by ESE–WNW to E–W and NE–SW striking faults. Massico horst, the Volturno and Garigliano depressions).

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Results show that the Campanian–Latial continental margin is characterized by a series of structural lows and highs that match with the main structures on the mainland (Mt. The interpretation of the seismic lines is discussed in light of the available geological (stratigraphic and structural) and geophysical (gravimetric and magnetic) information. The aim is to characterize: (1) the structural features of the 41st Parallel Line (41PL), an E–W elongated magnetic anomaly zone separating the Northern Tyrrhenian domain from the Southern Tyrrhenian domain and (2) to study the relationships between the 41PL and the Ortona–Roccamonfina Line (ORL), a tectonic structure transversal to the Apennines along which the Northern Apennine Arc merges the Southern Arc. Seismic study of the ‘41st Parallel’ Fault System offshore the Campanian–Latial continental margin, ItalyĤ1st Parallel Line, Apennines, seismic analysis, Tyrrhenian Sea Campania MondragoneĪ set of seismic reflection lines, collected in the Southern Tyrrhenian Sea offshore the Campanian–Latial continental margin has been selected and interpreted. According to this model, the observed variations in W2 water composition could be the consequence of stress build-up prior to the seismic events, and stress reduction afterwards.ĬNR, Istituto di Geoscienze e Georisorse, Pisa, 56124, Italy These changes in composition could be explained by the dilatancy–fluid diffusion model. After the seismic activity, the W2 water returned to its pre-earthquake reservoir composition. In the period 1986-1988, the composition of the W2 water changed just before two sequences of tectonic earthquakes, from the almost pure reservoir component to the almost pure steam-heated meteoric component. Vulcano Island, Italy, the thermal water in the shallow water well W2 is a mixture of reservoir water and shallow steam-heated groundwater of meteoric origin. Geochemistry thermal waters isotopes earthquakes seismic Vulcano Island Sicily, Italy Mori, Notsu, Tohjima,Wakita: Laboratory for Earthquake Chemistry, Faculty of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan Nuccio: Instituto di Mineralogia Petrografia e Geochimica, Università degli Studi, via Archirafi 36, 90123 Palermo, Italy Italiano: Instituto di Geochimica dei Fluidi-CNR, via Torino 27 / D, 90133 Palermo, ItalyĪ tentative correlation between seismic activity and changes in the composition of thermal waters on Vulcano island, Italy. Because temporal variations in S/Cl ratios can provide precursory signals for volcanic eruptions, this remote sensing technique can used efficiently for evaluation of volcanic activity. This suggests that this remote monitoring technique is capable of detecting spatial distribution in the S02/HCl ratios of volcanic plumes. Our results show that the S02/HCl ratios of two fumaroles only a few tens of metres apart exhibits differences of about twofold.

The S02/HC1 ratio of the FA fumarole was higher than that of the gas collected directly in the fumarolic vent (S02/HCl ratio = 2.9), and was closer to the S(total)/HC1 ratio ( = 4.6) of the collected gas. The measured S02/HCl ratios in the FA, F47, FW and lower parti of the F21 fumaroles were 4.5-5.4, 3.5, 9.5-11.2 and 5.8 respectively.

Infrared absorption spectra of HC1 and SO2 were observed for four fumaroles a few tens of metres apart using the hot fumarolic surface as an infrared light source. The measurements were made from the southern crater rim of Fossa Grande Crater, about 400 m from the fumarolic area in the crater. Geochemistry fumarolic gas chemestry FT-IR spectral radiometer Vulcano ItalyĪn infrared absorption spectroscopy remote sensing technique was used to determine the S02/HCl ratio in fumarolic plumes at Vulcano, Italy. Remote detection of fumarolic gas chemistry at Vulcano, Italy,using an FT-IR spectral radiometer Mori,T Notsu,K Tohjima,Y Wakita,H Nuccio,M Italiano,F

Notsu valley