The Web-powered Earthquake Meter

A Japanese company called SunShine, Ltd., has developed an Internet-connected device that can warn you of an impending earthquake as many as 20 seconds before the tremors strike. The paperback-novel-sized device hooks into Japan's Meteorological Agency's early warning system, and emits an alarm when an earthquake occurs. The downside? Some reports suggest that it isn't always accurate. Not to mention that it won't actually give you a heads-up if you happen to be near the epicenter, since the shakes will spread faster than the Meteorological Agency's detection system can spread the word. Life-saving potential aside, a bit of clever hacking could turn it into a pretty good party trick.—Gregory Mone

Via Reuters

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Earthquakes will occur anywhere within the earth where there is sufficient stored elastic strain energy to drive fracture propagation along a fault plane. In the case of transform or convergent type plate boundaries, which form the largest fault surfaces on earth, they will move past each other smoothly and aseismically only if there are no irregularities or asperities along the boundary that increase the frictional resistance. Most boundaries do have such asperities and this leads to a form of stick-slip behaviour. Once the boundary has locked, continued relative motion between the plates leads to increasing stress and therefore, stored strain energy in the volume around the fault surface. This continues until the stress has risen sufficiently to break through the asperity, suddenly allowing sliding over the locked portion of the fault, releasing the stored energy.

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this phenomenon is more interesting than any meteorological issues, That's why everybody talks about it

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