When the next big earthquake strikes somewhere around the world, it will arrive without warning, destroying infrastructure and putting lives at risk.
Yet for days leading up to the event, titanic geological forces will already be at work, warping the crust in subtle ways that could, in theory, predict the coming catastrophe.
"We are not claiming that this signal exists before every earthquake," QuakeFinder director Dan SchneiderYet the findings could be enough to keep the controversial topic of electromagnetic forecasts of major tremors alive for a little longer. Unweaving a reliable signal from this noise requires having accurate measuring equipment at fixed locations near sizable tremors. Even where that occurs, enough quakes of the right size need to be recorded for a statistical sample.
After selecting quakes for which there were measurements from two close sites, and excluding pairs of sites without suitable recordings, the researchers were left with measurements on 19 earthquakes.
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