New AGU_Eos blog on GlobalSeismicNetworks w/ USGS_Quakes scientists. DYK GSNs can be “used to track changes in global ocean wave activity, which can be important for climate science”? Or that they can record movements “as small as the size of an atom”?
explores the history and resulting scientific achievements of Global Seismographic Networks. We asked the lead author to give an overview of how Global Seismographic Networks evolved, what they’ve uncovered, and what challenges remain.Global seismographic networks are collections of seismic stations that measure near real-time ground motion and send those data to scientists. The instruments at these stations are so sensitive that they can record earthquakes from all over the world.
Although the WWSSN was state of the art at the time, it was later realized that the network was unable to record the slowest oscillations of great earthquakes, also known as normal modes. Large earthquakes cause normal modes to oscillate through the Earth much like ringing a bell. The Earth rings for many days, and each oscillation takes several minutes to complete.
Through locating and determining slip mechanisms of earthquakes, the long-running history of these networks has also helped quantify plate tectonics through the characterization of earthquakes along tectonic plate boundaries.
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