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The JMA announced the Earthquake Early Warning hit (accuracy) rate for the 2011 fiscal year on 31 May 2012. The hit rate is the percentage of warnings issued immediately on the detection of P-waves with a Japan Meteorological Agency seismic intensity scale (震度, shindo) number (0 to 7) within one shindo number of the measured earthquake.
For example, the 1984 Nagano earthquake, which caused a lot of damage but was only rated as a 4 in terms of seismic intensity, and the 1946 Nankai earthquake, a huge earthquake that was rated as a 5, would have been given lower ratings if there weren't any monitoring stations near their origin points before 1995. After the increase in ...
Japan's Earthquake Early Warning system was put to practical use in 2006. The system that warns the general public was installed on October 1, 2007. [25] [26] It was modeled partly on the Urgent Earthquake Detection and Alarm System (UrEDAS ) of Japan Railways, which was designed to enable automatic braking of bullet trains. [27]
In Japan, for shallow (depth < 60 km) earthquakes within 600 km, the Japanese Meteorological Agency calculates [21] a magnitude labeled MJMA, M JMA, or M J. (These should not be confused with moment magnitudes JMA calculates, which are labeled M w (JMA) or M (JMA) , nor with the Shindo intensity scale .)
A tsunami advisory has been issued by the Japanese meteorological agency on Thursday after a 6.1 magnitude earthquake struck outlying islands in the Izu chain.. The forecaster warned of waves up ...
In Japan, for shallow (depth < 60 km) earthquakes within 600 km, the Japanese Meteorological Agency calculates [2] a magnitude labeled MJMA, M JMA, or M J. (These should not be confused with moment magnitudes JMA calculates, which are labeled M w (JMA) or M (JMA) , nor with the Shindo intensity scale .)
The massive earthquake reportedly killed at least 4 people, caused buildings to collapse and power to be knocked out. Multiple deaths reported following powerful earthquake in Japan Skip to main ...
The JMA defines precise meanings for nearly all its weather terms as the Information for Severe Weather Preparation (防災気象情報, Bousai Kishō Jōhō). This article describes JMA terminology and related JMA weather scales. Some terms may be specific to certain regions.