Abstract
IN the Bollettino della Società Sismologica Italiana, vol. ix., No. 7, Dr. A. Ricco gives an interesting paper on the relative values of gravity in the vicinity of Etna, Sicily, the Æolian Islands, and southern, Italy. The results are shown in two sketch maps, on which a series of lines having the appearance of isomagnetics pass through places at which the difference between the expected and the observed values for g are equal. The smallest values for the anomaly or g—γ. are found round the summit of Etna, whilst maxima occur in the proximity of deep water about 80 km. to the south-south-west and 150 km. at Stromboli to the north. A similar but not so marked gradient is found in the vicinity of the Bay of Naples. Along the Apennines and in central Sicily the anomaly is small, and the gradient is gentle. These observations are discussed in relation to volcanic and seismic activity, orographic and geotectonic conditions. An obituary notice of Dr. Mosé Contarini, who odied at the early age of twenty-eight, at the commencement of a promising career, and a catalogue of disturbances, for July, 1902, complete the number.
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Seismological Notes . Nature 70, 189–190 (1904). https://doi.org/10.1038/070189a0
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DOI: https://doi.org/10.1038/070189a0