 |
| Titel |
Crustal deformation and AE monitoring: annual variation and stress-soliton propagation |
| VerfasserIn |
M. Poscolieri, G. P. Gregori, G. Paparo, A. Zanini |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 6, no. 6 ; Nr. 6, no. 6 (2006-11-03), S.961-971 |
| Datensatznummer |
250003807
|
| Publikation (Nr.) |
 copernicus.org/nhess-6-961-2006.pdf |
|
|
|
|
|
| Zusammenfassung |
| The stress propagation through the crust can be effectively monitored by
means of acoustic mission (AE) techniques (ultrasounds). The \textit{AE} intensity is
indicative of the amount of stress that affects some lithospheric and/or
crustal slab of some (ultimately unknown) scale size. In principle, such
scale size can be different in different areas, as it depends on their
respective tectonic setting, by which a variety of prime causes ought to be
considered: every cause can eventually prevail over others. Two basic
phenomena are here reported. If the crust behaves like a comparatively ideal
elastic body, an annual variation is observed, which appears in-phase and
correlated, when comparing AE records collected at the Italian site and on
the Cephallonia Island. It seems being astronomically modulated, hence it
should display a planetary scale. One likely explanation is in terms of the
loading tide. Such interpretation can be confirmed by some additional
modelling and analysis upon considering the motion of the Sun and of the
Moon. A second observed effect refers to the case in which the crust feels
the effect of the fatigue that reduces its elastic performance. The
phenomenon can be described in terms of stress solitons that cross the area
being monitored. They can be unambiguously recognised, and the possibility
is therefore envisaged of eventually using them for measuring the
propagation speed of stress through the crust over continental or planetary
scales. The residuals, with respect to such regularly recognisable effects,
of the recorded AE signals are to be investigated in a few subsequent
analyses (in progress), as they appear to contain additional relevant
physical information, still being much different from any simple random
noise. A final recommendation ought therefore to be stressed, for setting up
some array of at least a few AE recording stations to be simultaneously
operated over some continental scale area and for a few years at least.
Their potential applications still appear much promising and to be still
focused in their complete, specific, operative and physical details and
interpretation. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|