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Authors: Masci, F.*
Thomas, J. N.*
Title: On the relation between the seismic activity and the Hurst exponent of the geomagnetic field at the time of the 2000 Izu swarm
Title of journal: Natural Hazards and Earth System Sciences (NHESS)
Series/Report no.: /13 (2013)
Publisher: Copernicus Publications
Issue Date: 6-Sep-2013
DOI: 10.5194/nhess-13-2189-2013
Keywords: Geomagnetic field,Magnetic anomalies, Earthquake precursors, Hurst exponent
Abstract: 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.
Appears in Collections:04.05.04. Magnetic anomalies
Papers Published / Papers in press

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