They were able to trace the origin of the seismic waves produced by the 7.9 magnitude earthquake and its aftershocks, according to a press release.īut what puzzled this team is that the shock erupted in the lower mantle, closer to Earth's core. The study, published in the journal Geophysical Research Letters, used measurements collected by the High Sensitivity Seismograph Network, a string of stations across Japan that record seismic data. Louis who was not involved in the study, tells National Geographic. "This is by far the best evidence for an earthquake in the lower mantle," Douglas Wiens, a seismologist at Washington University in St. It's so deep that it nears the layer of Earth known as the lower mantle, reports Andrei Ionescu for. One of the aftershocks occurred deeper than the original earthquake itself, at 467 miles. In 2015, a 7.9 magnitude earthquake struck beneath Japan's Bonin Islands. Now, a team of researchers has zeroed in on what could be the deepest earthquake ever detected, shaking up scientists' understanding of them.
The bulk of them were shallow, and only a mere four percent occurred beyond 186 miles deep, which was thought to be the maximum depth for what scientists call "deep earthquakes," reports Maya Wei-Haas for National Geographic. In 2015, a 7.9 magnitude earthquake struck beneath Japan's Bonin Islands.īetween 19, nearly 57,000 earthquakes rattled our planet.
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