Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.133..451d&link_type=abstract
Geophysical Journal International, Volume 133, Issue 2, pp. 451-458.
Astronomy and Astrophysics
Astronomy
9
Dyke Intrusion, Remanent Magnetization, Thermomagnetic Anomalies
Scientific paper
During the 1989 eruption of Mount Etna, two fracture systems, trending c. N45°E and N150°E, opened at the foot of its 3000m high SE Crater and propagated quickly downslope to distances of ~3 and 7km, respectively. The northeastern fracture fed a flank eruption, whereas the southeastern fracture remained dry and offered contrasting volcanological and geophysical evidence of the presence of magma at a shallow depth. During the opening of this non-eruptive fracture system, a differential magnetic network was set up on a short profile across its distant extremity. Initially, the magnetic field did not display any change along the profile between frequent surveys. However, repeated measurements at intervals of about 3months for two years revealed the slow build-up of a 130nT anomaly. The anomaly vanishes laterally within 0.2km of the surface expression of the fracture system. This exceptional set of observations constrains the location and time of cooling of a shallow dyke. The increase in magnetization of the dyke inferred by the rate of growth of the anomaly leads to the interpretation that the dyke was emplaced near the end of the eruption.
Del Negro Ciro
Ferrucci Fabrizio
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