OGAWA, Tsutomu. 2018. “A Reassessment of the Anomalous Geomagnetic Diurnal Variation Two Months Prior to the 2011 Tohoku Earthquake, Japan (Mw 9.0)”. Annals of Geophysics 60 (6 Sup):GM671. https://doi.org/10.4401/ag-7467.