Updating cell phone range
detect P-waves (upper), the JMA immediately analyzes the readings and distributes the warning information to advanced users such as broadcasting stations and mobile phone companies, before the arrival of S-waves (lower).
When there is a P-wave detection from any two or more of the 4,235 seismometers installed throughout Japan, the JMA automatically analyzes and predicts the rough area of the earthquake's epicenter.
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The hit rate is defined as the percentage occurrence of the warning issued immediately upon P-waves detected having a Japan Meteorological Agency seismic intensity scale For the fiscal years 2007 to 2009 the hit rate was over 75%.
In fiscal year 2010, the hit rate came down to 28% due to the number of aftershocks following the 2011 Tōhoku earthquake and tsunami, which occurred near the end of fiscal year 2010.
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Bluetooth-enabled to allow you to pair it with a headset, tablet or other device.The hit rate for that year had been 72% until the Tohoku earthquake.Measurement techniques have subsequently been refined to ignore small scale earthquakes; the hit rate for fiscal year 2011 increased to 56%.Actual user memory will vary depending on the operator and may change after software upgrades are performed.The bandwidths supported by the device may vary depending on the region or service provider.