Over 10,000 earthquakes have hit the Noto Peninsula over the last three years. They are believed to be emanating from an long-dead volcano, with fluids pushing through the collapsed system.
A huge swarm of earthquakes that has been rocking Japan for three years appears to be the result of fluids moving through an extinct, collapsed volcano, new research suggests.
"This earthquake swarm was caused by upward fluid movement through a complex network of faults," study lead author Keisuke Yoshida, an Earth scientist at the Research Center for Prediction of Earthquakes and Volcanic Eruptions at Tohoku University in Japan, told Live Science. Related: Scientists discover ancient, underwater volcano is still active — and covered in up to a million giant eggs
They found that the quakes originated 12.4 miles deep in the crust, before gradually migrating to shallower depths. This is consistent with fluid ascending through an existing network of faults, the researchers reported. The location of the quake epicenters occurred in a circular pattern, suggesting a ring-like structure to this fault network. This could indicate an ancient, collapsed caldera from a now-extinct volcano.
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