🍀 Ireland's seismic secret unveiled! Scientists have solved the centuries-old mystery of the Emerald Isle's scarcity of earthquakes compared to neighbouring Britain. The answer lies beneath the surface. EarthquakeMystery Ireland 🌍💭
“We have a very good frame of understanding seismicity at plate margins,” said geologistof the University of Melbourne, who wasn’t involved in the new study. “The question is, What’s controlling seismicity in continental interiors away from plate margins?”
Faults aren’t the answer, Lebedev said, because many of Britain’s major faults cut through Ireland, too. Neither is the type of crust present on the two islands. Britain and Ireland share a geological history, both having been assembled from bits of an ancient continent called Laurentia and a scrap of crust called Avalonia during the Caledonian Orogeny—one of the mountain-building events that stitched together the supercontinent Pangaea.
With this beefed-up Irish seismic network and data from seismometers in Britain, Lebedev and his colleagues previously used surface wave tomography to map the thickness of the lithosphere in Britain and Ireland. The technique takes advantage of the fact that some seismic waves travel quicker through colder lithosphere, which also tends to be thicker. With it, scientists can map subsurface structures in 3D.
However, it was long assumed that the lithosphere beneath Ireland and Britain was equally thick—there wasn’t any evidence to the contrary, Lebedev said. “So we have a 150-year-old puzzle that has been unsolved until now.”
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