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The Summary. Japan’s meteorological agency on Thursday issued its first-ever “megaquake advisory.” The warning followed a 7.1-magnitude earthquake off the country’s southern coast.
For U.S. earthquake scientists, Japan's 'megaquake' warning renewed worries about when and how to warn the public if they find clues that the 'big one' might be coming for the West COast.
An upgrade to California's earthquake early-warning system using GPS data will allow more timely alerts about shaking and better estimate the magnitude of a megaquake.
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.
The United States Geological Survey reported a magnitude (M ww ) of 7.1, at a depth of 25 km (16 mi) and a maximum Modified Mercalli intensity of VIII (Severe). [2] At least 24 aftershocks were recorded following the event, [8] with the strongest measuring M w 5.5.
An animation detailing how earthquake warning systems work: When P waves are detected, the readings are analyzed immediately, and, if needed, the warning information is distributed to advanced users and cell phones, radio, television, sirens, and PA systems/fire alarm systems before the arrival of S waves.
Japan issued its first-ever advisory on higher-than-usual risks of a megaquake, after a strong magnitude 7.1 quake occurred on Thursday at the edge of a tremulous seabed zone along the Pacific ...
The Mexican Seismic Alert System (Spanish: Sistema de Alerta Sísmica Mexicano or SASMEX) is the earthquake warning system covering portions of central and southern Mexico. It currently provides up to 60 seconds' warning of earthquakes to Mexico City , Acapulco , Chilpancingo , Morelia , Puebla City , Oaxaca City , Guadalajara , Colima and Toluca .
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