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| Titel |
Review Article: On the relation between the seismic activity and the Hurst exponent of the geomagnetic field at the time of the 2000 Izu swarm |
| VerfasserIn |
F. Masci, J. N. Thomas |
| 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 ; 13, no. 9 ; Nr. 13, no. 9 (2013-09-06), S.2189-2194 |
| Datensatznummer |
250085508
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| Publikation (Nr.) |
 copernicus.org/nhess-13-2189-2013.pdf |
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| Zusammenfassung |
| Many papers document the observation of earthquake-related precursory
signatures in geomagnetic field data. However, the significance of these
findings is ambiguous because the authors did not adequately take into
account that these signals could have been generated by other sources, and
the seismogenic origin of these signals have not been validated by comparison
with independent datasets. Thus, they are not reliable examples of magnetic
disturbances induced by the seismic activity. Hayakawa et al. (2004) claim
that at the time of the 2000 Izu swarm the Hurst exponent of the
Ultra-Low-Frequency (ULF: 0.001–10 Hz) band of the geomagnetic field
varied in accord with the energy released by the seismicity. The present
paper demonstrates that the behaviour of the Hurst exponent was
insufficiently investigated and also misinterpreted by the authors. We
clearly show that during the Izu swarm the changes of the Hurst exponent were
strongly related to the level of global geomagnetic activity and not to the
increase of the local seismic activity. |
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