GPS satellites will be used for quick earthquake alerts

The researchers explained that a GPS-based global earthquake monitoring system can provide

more timely and accurate warning of powerful earthquakes than traditional seismic networks. It can also reduce the frequency of false alerts.

In a new study published in the publicationBulletin of Seismological Society, a research team detailed a new process for developing a global earthquake warning system that measures the displacement of Global Positioning System (GPS) satellite receiver stations when an earthquake deforms the earth's crust. The system estimates the severity of an earthquake within seconds and issues warnings in less than two minutes from the first ground movement is detected.

According to study lead author TimothyMelbourne, professor of geology at Central Washington University, a GPS-based detection system can provide earlier and more accurate alerts than traditional seismic sensors installed in tectonically active regions. They may fail due to a burst of data when seismic waves first appear.

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“The problem is that when earthquakesbecome very strong, it is very difficult for seismic networks to understand what happened in the first minutes after the event, the researchers noted. “Even with a moderate earthquake, there is a very complex seismic trace. Seismic waves are radiated into the earth, they are reflected inside the earth and interact with structures. It is very difficult to determine what was the source of the waves and what was the result of reverberations in the earth's crust. "

Seismologists usually wait for the wavesspread further from the center, and evaluate the earthquake from afar. But in some cases, in the face of the threat of highly magnetic earthquakes and potentially devastating tsunamis that can kill thousands of people, this is not possible.

For example, in 2019, an American app forearthquake warnings ShakeAlert failed to alert Los Angeles residents to the 6.4 magnitude earthquake that struck Southern California on Independence Day because it misjudged the severity of the tremors. However, false alerts can provoke panic and reduce the credibility of traditional systems in the future.

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