Changes in the rotation might occur on a decadal scale and could aid our understanding of how processes deep in the Earth affect its surface.
“In theory, it has been going on for a long time but we only have observations over a few decades,” said Xiaodong Song, a seismologist at Peking University in Beijing and a co-author of the study.
“The changes they noticed are valid although what’s actually happening isn’t so clear,” Dr. Vidale said in an interview with. “They have a very good analysis and the theory they put in the papers is probably as good as anything at the moment, but there are several competing ideas as well.”
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