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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.
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.
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.
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.
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.
Earthquake prediction is a branch of the science of seismology concerned with the specification of the time, location, and magnitude of future earthquakes within stated limits, [1] [a] and particularly "the determination of parameters for the next strong earthquake to occur in a region". [2]
A 7.1-magnitude earthquake rocked the southern coast of Japan on Thursday, Aug. 8, prompting the country to issue its first “megaquake” warning.
Map showing the amount of advance warning time that might be available from ShakeAlert for several plausible future earthquake scenarios. [1]Initially the system has been developed to monitor and alert the West Coast of the United States, an area with significant seismic risk due to the San Andreas fault zone and the Cascadia subduction zone.