The mechanism of Earthquake Early Warning
<a href="//commons.wikimedia.org/wiki/User:Genppy" title="User:Genppy">Genppy</a>
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self-made (based on <a rel="nofollow" class="external text" href="http://www.jma.go.jp/jma/en/Activities/eew1.html">What is the Earthquake Early Warning ?</a>, <a href="https://en.wikipedia.org/wiki/en:Japan_Meteorological_Agency" class="extiw" title="w:en:Japan Meteorological Agency">Japan Meteorological Agency</a>)