Spikes in sodium and hydrogen in well water warned of mounting strain before two Iceland earthquakes, geologists say. "All we found is chemical changes before two earthquakes, and that's it," said lead study author Alasdair Skelton, a geochemist at Stockholm University in Sweden. On the other hand, Skelton did intend to prove that water chemistry foretells earthquakes. "We had reason to believe that groundwater may be an indicator of changes before earthquakes."
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