『North American Craton Actively Thinning as Rock Blobs Drip From Ancient Foundation』のカバーアート

North American Craton Actively Thinning as Rock Blobs Drip From Ancient Foundation

North American Craton Actively Thinning as Rock Blobs Drip From Ancient Foundation

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概要

 Geoscientists at the University of Texas Jackson School of Geosciences have discovered that the underside of the North American continent is actively dripping away in blobs of rock from its ancient craton foundation. Lead researcher Junlin Hua, now at the University of Science and Technology of China, used advanced full-waveform seismic tomography from the EarthScope project to reveal these drips beneath the craton, which spans most of the United States and Canada. The process, driven by the Farallon tectonic plate subducting 600 kilometers away, is causing widespread thinning across the craton, not just in one spot, as computer models confirm dripping halts when the plate is removed. This ongoing thinning challenges the craton's famed stability after billions of years and offers a live view of deep Earth dynamics.

In Hawaii, Kilauea volcano's summit at Halemaumaumau paused after episode 42 of lava fountaining on February 15, which lasted under ten hours with peaks of 400 meters from south and north vents, erupting 11.4 million cubic meters of lava and scattering light ash downwind. United States Geological Survey reports show inflation resuming, with 17.2 microradians of tilt recovery and sulfur dioxide emissions at 1000 to 1500 tonnes daily, signaling episode 43 may soon begin amid low rift zone activity. A minor magnitude 1.8 earthquake struck six miles south of Skwentna, Alaska, on February 25 at a depth of 72 kilometers, per the Alaska Earthquake Center.

Elsewhere in the United States, unrest at Ahyi volcano in the Northern Mariana Islands eased by February 24, according to United States Geological Survey Northern Mariana Islands monitoring. Stanford University researchers mapped rare deep mantle earthquakes globally on February 20, clustering near the Bering Strait in North America and beneath the Himalayas, using seismic wave analysis to probe the crust-mantle boundary and tectonic drivers up to 80 kilometers deep.

These events highlight emerging patterns of mantle instability under North America, from cratonic drips to subtle quakes, alongside Hawaii's persistent volcanism, underscoring active geological flux shaping the continent today.

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