JMA announced the hit rate of Earthquake Early Warning (EEW) on 31 May 2012, end of fiscal year 2011. The hit rate defined here is that the Japan Meteorological Agency seismic intensity scale (震度, shindo?) number with warning issued immediately upon P-waves detected is fall or hit within plus-minus 1 Magnitude-Shindo Number, ranges 0 to 7, out of ten numbers actually measured Magnitude-Shindo Number as the single earthquake.
- Fiscal year 2007: 75%
- Fiscal year 2008: 82%
- Fiscal year 2009: 76%
- Fiscal year 2010: 28%
- Fiscal year 2011: 56%
Fiscal year 2007 to 2009 hit rate recorded over 75%. Fiscal year 2010 hit rate came down to 28% due to the number of successive aftershock after 2011 Tōhoku earthquake and tsunami which occurred almost the end of fiscal year 2010, 11 March 2011. The hit rate was 72% till 10 March 2011 in fiscal year 2010. The reason of hit rate came down to 28% from 72% is very successive plural number of aftershock judged to single large earthquake. The computer program has been improved to ignore small scale earthquake from predicting program to increase hit rate and fiscal year 2011 hit rate increased to 56%. JMA aim to increase hit rate over 85% in fiscal year 2015.
Read more about this topic: Earthquake Early Warning (Japan)
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