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Authors: Masci, F. 
Title: On the ULF magnetic ratio increase before the 2008 Iwate–Miyagi Nairiku earthquake by Hirano and Hattori (2011)
Issue Date: 29-Aug-2012
Series/Report no.: /56 (2012)
DOI: 10.1016/j.jseaes.2012.05.020
Keywords: Geomagnetic field
Magnetic anomalies
Earthquake precursors
Subject Classification04. Solid Earth::04.05. Geomagnetism::04.05.99. General or miscellaneous 
04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies 
04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous 
Abstract: Hirano and Hattori (2011), hereafter cited as H&H, report the observation of anomalous increases in the ULF geomagnetic field spectral density ratio which the authors claim to be possible precursors of the 2008 Iwate–Miyagi Nairiku earthquake. Here the results of H&H are reviewed taking into account the global geomagnetic activity level by means ofPKp index. This paper cast serious doubts on the seismogenic origin of the magnetic signatures documented by H&H showing that the anomalous signals are normal ULF magnetic variations induced by solar–terrestrial interaction. In summary, H&H’s claims that magnetic field disturbances about a month before the Mw 6.9 Iwate–Miyagi Nairiku earthquake on June 13, 2008 are precursors to the earthquake are unlikely to be correct.
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