Lyell Collection
Geological Society, London, Special Publications
Lyell Centre  |   Lyell Collection  |   Subscriptions   |   Geological Society  |   Email alerts  |   Online bookshop  |   Help

Keywords:
Author:
Advanced search>>
This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow Request Permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Paparo, G.
Right arrow Articles by Glorioso, G.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Geological Society, London, Special Publications; 2006; v. 261; p. 47-61;
DOI: 10.1144/GSL.SP.2006.261.01.04
© 2006 Geological Society of London

Crustal stress crises and seismic activity in the Italian peninsula investigated by fractal analysis of acoustic emission, soil exhalation and seismic data

Gabriele Paparo1, Giovanni P. Gregori1, Maurizio Poscolieri1, Iginio Marson2, Francesco Angelucci1 & Giorgia Glorioso3

1 Istituto di Acustica O. M. Corbino (CNR), via Fosso del Cavaliere 100, 00133 Roma, Italy pangelu{at}tiscalinet.it
2 Dipartimento di Ingegneria Navale, del Mare e per l’Ambiente, Università di Trieste, via Valerio 10, 34127 Trieste and Istituto Nazionale di Oceanografia e Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/c, 34010 Sgonico, Trieste, Italy marson{at}ogs.trieste.it
3 Facoltà di Ingegneria, Dipartimento di Ingegneria Navale, del Mare e per l’Ambiente, Università di Trieste, via Valerio 10, 34127 Trieste, Italy giorgiaglorioso{at}libero.it

(e-mail: gabriele.paparo{at}idac.rm.cnr.it)

(e-mail: giovanni.gregori{at}idac.rm.cnr.it)

(e-mail: maurizio.poscolieri{at}idac.rm.cnr.it)

(e-mail: marson{at}univ.trieste.it)

Crustal stress can be monitored by acoustic emissions (AE, ultrasound), which give an indication of whether a physical system is subject to stress, either of tectonic or endogenous origin. AE intensity critically depends on the damping of the signal; however, AE signals are clear indicators of the fatigue state of the crustal structures constituting the AE source. This aspect can be studied by fractal analysis of AE time series; these are, however, not suited for earthquake forecasting, as they only denote a changing state involving large lithospheric volumes. Several case histories from Italy show that an increased high-frequency AE activity (200 kHz) occurs approximately seven to eight months in advance of large earthquakes that affect areas of a few hundred kilometres radius, and an increased low-frequency AE activity (at 25 kHz) is observed several weeks in advance. Low-frequency AE also correlate with soil exhalation (water-well chemistry) and CH4, whereas fractal analysis of AE signals recorded close to a ‘future’ epicentral area gives a clear indication of the evolution of the system from about two months before the mainshock. This suggests that systematic monitoring of crustal stress variations may be used for assessing the time evolution of seismic activity.





This article has been cited by other articles:


Home page
 Geological Society, London, Special PublicationsHome page
M. Poscolieri, E. Lagios, G. P. Gregori, G. Paparo, V. A. Sakkas, I. Parcharidis, I. Marson, K. Soukis, E. Vassilakis, F. Angelucci, et al.
Crustal stress and seismic activity in the Ionian archipelago as inferred by satellite- and ground-based observations, Kefallinia, Greece
Geological Society, London, Special Publications, 2006; 261: 63 - 78.
[Abstract] [PDF]