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Geologists have found anomalies under the Cascadia fault line off the West coast of the United States. Scientists say pieces of mantel have been discovered “rising up” from underneath the underwater fault line.

New data from the seismometers monitoring the Cascadia fault line helped University of Oregon researchers identify seismic anomalies at both ends of the fault where they believe pieces of the upper mantle are rising and modulating earthquake activity. According to Sci-Tech Daily, these anomalies may influence the location, frequency, and strength of earthquake events along the U.S. Pacific Northwest.