From sott.net
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Some earthquakes can leave a legacy of aftershocks that last for centuries.
Low-level seismic rumbles appear to foreshadow many quakes. Yet not always: the 2008 Sichuan quake in China came out of the blue. These rumbles may not be precursors but aftershocks - readjustments at a fault following a larger event, in some cases centuries earlier.
Seth Stein of Northwestern University in Evanston, Illinois, and colleagues analysed the rate of...
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