Mauna Loa, Hawaii’s most massive volcano, may be splitting open the Earth’s crust. A team of French geologists reached that conclusion after pinpointing the locations of more than 1,000 miniature earthquakes that happened beneath Mauna Loa and its little sister volcano, Kilauea, between 1988 and 1999. Some of the earthquakes under Kilauea occurred at depths well below the ocean crust, suggesting a fault there.
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