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http://hdl.handle.net/2122/2197
Authors: | Patanè, D.* Barberi, G.* Cocina, O.* De Gori, P.* Chiarabba, C.* |
Title: | Time-resolved seismic tomography detects magma intrusions at Mt. Etna | Journal: | Science | Series/Report no.: | /313 (2006) | Publisher: | American Association for the Advancement of Science | Issue Date: | 2006 | DOI: | 10.1126/science.1127724 | URL: | www.sciencemag.org/cgi/content/full/313/5788/821/DC1 | Keywords: | NONE | Subject Classification: | 04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processes 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring |
Abstract: | The continuous volcanic and seismic activity at Mount Etna makes this volcano an important laboratory for seismological and geophysical studies. We used repeated three-dimensional tomography to detect variations in elastic parameters during different volcanic cycles, before and during the October 2002–January 2003 flank eruption. Well-defined anomalous low P- to S-wave velocity ratio volumes were revealed. Absent during the pre-eruptive period, the anomalies trace the intrusion of volatile-rich (Q4 weight percent) basaltic magma, most of which rose up only a few months before the onset of eruption. The observed time changes of velocity anomalies suggest that four-dimensional tomography provides a basis for more efficient volcano monitoring and shortand midterm eruption forecasting of explosive activity. |
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