Faraday's law of induction tells us that a conductor cutting a background magnetic field generates an electric field. The tsunami-generated magnetic field (we call it the "tsunami magnetic field" hereafter) is a magnetic field generated by the tsunami's electromotive force of the moving conductive seawater under the geomagnetic main field. The tsunami magnetic field was found to arrive earlier than the tsunami sea level change (e.g., Toh et al., 2011), which can be exploited to detect tsunami events (

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