The seismic waves generated by the earthquake that hit Syria and Turkey on 6 February were also detected in Antarctica: this is demonstrated by the seismograph traces of the Baia Terra Nova station at the Italian Mario Zucchelli base (located 15,000 kilometers from the epicenter). , published on the website of the National Institute of Geophysics and Volcanology (Ingv).
“The seismic waves generated by a strong earthquake such as the one that occurred on 6 February in Turkey can be recorded all over the planet”, observe the Ingv experts. “P (Prime) and S (Second) waves travel inside the Earth and allow us to ‘radiograph’ its depths, bouncing between the various discontinuities under the surface. Most of the knowledge on the ‘interior of the Earth”.
In addition to the volume waves (P and S) that pass through the Earth, another type of waves are radiated by the seismic source: surface waves (Love and Rayleigh, named after the scientists who first studied them). “These waves are confined to traveling only on the Earth’s surface, disappearing rapidly inside the Earth as one descends into the depths, similar to the wave motion of the sea,” the scholars add. “Surface waves propagate more slowly than volume waves, but they also attenuate more slowly, so that at a certain distance from the epicenter, surface waves have the greatest amplitude and can go around the Earth several times.”
A shakemove (made by Princeston University) simulates the propagation of the seismic waves generated by the earthquake in Turkey (through the solution of the equations that govern them) and highlights this passage also for the seismic stations located at the antipodes (the colors correspond to the upward movement – red and downwards – blue ).
Source: Ansa
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