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| Titel |
Magnetic transfer function entropy and the 2009 Mw = 6.3 L'Aquila earthquake (Central Italy) |
| VerfasserIn |
G. Cianchini, A. Santis, D. R. Barraclough, L. X. Wu, K. Qin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 19, no. 4 ; Nr. 19, no. 4 (2012-07-23), S.401-409 |
| Datensatznummer |
250014228
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| Publikation (Nr.) |
 copernicus.org/npg-19-401-2012.pdf |
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| Zusammenfassung |
| With the aim of obtaining a deeper knowledge of the physical phenomena
associated with the 2009 L'Aquila (Central Italy) seismic sequence,
culminating with a Mw = 6.3 earthquake on 6 April 2009, and possibly of
identifying some kind of earthquake-related magnetic or geoelectric anomaly,
we analyse the geomagnetic field components measured at the magnetic
observatory of L'Aquila and their variations in time. In particular, trends
of magnetic transfer functions in the years 2006–2010 are inspected. They
are calculated from the horizontal to vertical magnetic component ratio in
the frequency domain, and are very sensitive to deep and lateral geoelectric
characteristics of the measurement site. Entropy analysis, carried out from
the transfer functions with the so called transfer function entropy, points
out clear temporal burst regimes of a few distinct harmonics preceding the
main shock of the seismic sequence. A possible explanation is that they
could be related to deep fluid migrations and/or to variations in the
micro-/meso-fracturing that affected significantly the conductivity
(ordered/disordered) distribution in a large lithospheric volume under the
seismogenic layer below L'Aquila area. This interpretation is also supported
by the analysis of hypocentres depths before the main shock occurrence. |
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