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It is not a foolproof method. Ivan Wong, a seismologist and vice-president of URS Corporation, a consulting firm in Oakland, California, says that van der Elst's study is groundbreaking. But in some cases, he notes, well activity has induced large earthquakes without any warning swarms. Stephen Horton, a seismologist at the University of Memphis, Tennessee, says that suggests that injection wells may spawn earthquakes in at least two different ways.