Earthquake early warning and future problems for disaster mitigation

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  • 緊急地震速報の仕組みとこれからの課題
  • キンキュウ ジシン ソクホウ ノ シクミ ト コレカラ ノ カダイ

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Abstract

<p>We have developed an automatic system for earthquake early warning (EEW), which determines hypocenter location and magnitude within 1 to 3 seconds. Our system was installed in Japan Meteorological Agency (JMA) that started the practical service of EEW by TV and radio in October 2007. It determined hypocenter parameters within a few seconds from P wave arrivals. We found that 99% of hypocenter locations are nearly correct. We introduced a shaking intensity magnitude in addition to the moment magnitude so as to estimate a more reliable shaking intensity. We developed a home seismometer for the installation of dense seismic station for EEW. We demonstrated that EEW can produce warning times of 30-50 s for large earthquakes, such as Tokai, Tonankai and Nankai earthquakes.</p>

Journal

  • Oyo Buturi

    Oyo Buturi 80 (1), 18-23, 2011-01-10

    The Japan Society of Applied Physics

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