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Japan's Monitoring System Failed Three Times Wednesday, June 18, 2008 - Ehud Rattner Home >> Headlines >> Defense and Security   
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Japan's earth quake monitoring system has failed in its first three challenges since its introduction last year. Earthquakes that shake the ground with an intensity of a low 5 or above on Japan’s intensity scale (which specifically measures ground shaking, rather than quake magnitude per se, and has values that go up to 7) are supposed to trigger warnings. In each of the first three such cases, the earthquake shaking was borderline and the system initially underestimated the quake. (source: nature.com)
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