A University of Arizona tree-ring expert is closer than ever to pinning down the date of the infamous Thera volcano eruption—a goal she has pursued for decades.
and from ice cores in Antarctica and Greenland to create a comprehensive record of volcanic eruptions across the period when Thera must have occurred—1680 to 1500 B.C. They used sulfate and tephra evidence to rule out several of the events as potential Thera dates and used high-resolution techniques to geochemically confirm through the ice cores that the eruption recorded in1628 B.C. was Aniakchak II.
"One of these is Thera," Pearson said."We just can't confirm which one yet, but at least we now know exactly where to look. The challenge with Thera is that there's always been this discrepancy between multiple lines of dating evidence. Now that we know what the possible dates are, this evidence can be re-evaluated, but we still need a geochemical fingerprint to clinch it.
"We've looked at this same event that showed up in tree rings 7,000 kilometers apart, and we now know once and for all that this massive eruption is not Thera," Pearson said."It's really nice to see that original connection resolved. It also makes perfect sense that Aniakchak II turns out to be one of the largest sulfate ejections in the last 4,000 years—the trees have been telling us this all along.
"Building evidence in this research is best compared to criminal cases, where suspects must be shown to be linked to both the scene and time of the crime," Sigl said."Only in this case, the traces are already more than 3,500 years old."
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