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Tsunami: Ocean dynamo generator
Sugioka, H.; Hamano, Y.; Baba, K.; Kasaya, T.; Tada, N.; Suetsugu, D. (2014). Tsunami: Ocean dynamo generator. NPG Scientific Reports 4(3596): 7 pp. hdl.handle.net/10.1038/srep03596
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322, more
Peer reviewed article  

Available in Authors 

Keyword
    Marine

Authors  Top 
  • Sugioka, H.
  • Hamano, Y.
  • Baba, K.
  • Kasaya, T.
  • Tada, N.
  • Suetsugu, D.

Abstract
    Secondary magnetic fields are induced by the flow of electrically conducting seawater through the Earth's primary magnetic field (‘ocean dynamo effect’), and hence it has long been speculated that tsunami flows should produce measurable magnetic field perturbations, although the signal-to-noise ratio would be small because of the influence of the solar magnetic fields. Here, we report on the detection of deep-seafloor electromagnetic perturbations of 10-micron-order induced by a tsunami, which propagated through a seafloor electromagnetometer array network. The observed data extracted tsunami characteristics, including the direction and velocity of propagation as well as sea-level change, first to verify the induction theory. Presently, offshore observation systems for the early forecasting of tsunami are based on the sea-level measurement by seafloor pressure gauges. In terms of tsunami forecasting accuracy, the integration of vectored electromagnetic measurements into existing scalar observation systems would represent a substantial improvement in the performance of tsunami early-warning systems.

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