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Japan issued a “megaquake advisory” following a 7.1-magnitude earthquake off its coast. That raised the risk of a larger quake on the Nankai Trough, an underwater subduction zone.
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 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.
Diagram of a subduction zone. The megathrust fault lies on the top of the subducting slab where it is in contact with the overriding plate. The term megathrust refers to an extremely large thrust fault, typically formed at the plate interface along a subduction zone, such as the Sunda megathrust.
Japan, one of the most earthquake-prone nations on earth, issued its first-ever “megaquake advisory” last week after a powerful quake struck off the southeastern coast of the southern main ...
Envisioned focal area of M9.1 Nankai Trough Megathrust Earthquake, by Headquarters for Earthquake Research Promotion, 2013.. Nankai megathrust earthquakes (Japanese: 南海トラフ巨大地震, Hepburn: Nankai Torafu Kyodai Jishin) are great megathrust earthquakes that occur along the Nankai megathrust – the fault under the Nankai Trough – which forms the plate interface between the ...