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| Titel |
Ultrasound monitoring of applied forcing, material ageing, and catastrophic yield of crustal structures |
| VerfasserIn |
G. P. Gregori, M. Lupieri, G. Paparo, M. Poscolieri, G. Ventrice, A. Zanini |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 7, no. 6 ; Nr. 7, no. 6 (2007-11-28), S.723-731 |
| Datensatznummer |
250004818
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| Publikation (Nr.) |
 copernicus.org/nhess-7-723-2007.pdf |
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| Zusammenfassung |
| A new kind of data analysis is discussed – and a few case histories of
actual application are presented – concerning the physical information
attainable by acoustic emission (AE) records in geodynamically active or
volcanic areas. The previous analyses of such same kind of observations were
reported in several papers appeared in the last few years, and here briefly
recalled. They are concerned with the inference of the forcing ("F") acting
on the physical system, and on the ageing ("T") or fatigue of its "solid"
structures. The new analysis here discussed deals with the distinction
between a state of applied stress ("hammer regime"), compared to state of "recovery regime" of the
system while it seeks a new equilibrium state after having been perturbed.
For instance, in the case of a seismic event – and according to some kind
of almost intuitive argument – the "hammer regime" is the phenomenon leading to the
main shock, while the "recovery regime" deals with the well known aftershocks. Such same
intuitive inference, however, can be investigated by a much more formal
algorithm, aimed at envisaging the minor changes of the behaviour of the
system, during its history and during its present dynamic evolution. As a
demonstrative application, detailed consideration is given of AE records – each one lasting for a few years – collected on
the Italian peninsula vs. records collected on the Kefallinìa Island (western Greece). Such two
areas are well known being characterised by some great comparative
difference in their respective tectonic setting. When considering planetary
scale phenomena, they appear comparatively very close to each other. Hence,
they are likely being presumably affected by similar large-scale external
actions, although they ought to be expected to respond in some completely
different way. Such facts are clearly manifested by some substantially
different AE responses of the local crustal structures. However, a full
understanding of such entire set of geodynamic and tectonic details ought to
require several year data series of AE records, and/or (maybe) also
simultaneous AE records collected within some suitable array of AE stations.
Such understanding ought to permit the inference of the spatial features of
the crustal stress propagation – including its diagnosis and
"forecasting" – in addition to the temporal diagnosis and "prevision"
that can be attained by isolated point-like AE recording stations. Additional
analyses are in progress. |
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