The strong ground shaking is caused by shear waves which travel at about half the speed of the primary waves and much slower than electromagnetic signals. The physical basis for an earthquake early warning system is the speed of the seismic waves, which propagate after the release of stress from faults movement. It can also help tell the location of people trapped inside a structure following an earthquake.Įarthquake Early Warning (EEW) is a real-time earthquake information system that can detect the onset of the earthquake and issue warnings before the significant tremors take hold of an area, according to a press release by IIT Roorkee. It is a path-breaking achievement for the institute as it is the country's first application for notifying people about earthquake alerts.
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