Stealth magma surge triggered earthquakes under Azores island

A massive body of magma surged upward beneath São Jorge Island in Portugal's Azores archipelago in March 2022, triggering thousands of earthquakes before stalling underground. The event, detailed in a new study, represented a failed eruption that raised but ultimately eased fears of volcanic activity.

The magma originated from more than 20 kilometers below the surface and ascended rapidly over just a few days. It contained enough molten rock to fill roughly 32,000 Olympic-sized swimming pools yet halted at a depth of 1.6 kilometers, causing the island's surface to rise by about six centimeters. Most earthquakes occurred after the magma stopped moving upward, with activity concentrated along the Pico do Carvão Fault Zone.

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Damaged roads and buildings in northern Chile after a major earthquake, with people evacuating.
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Erdbeben der Stärke 6,9 erschüttert den Norden Chiles mit Epizentrum nahe Calama

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Ein Erdbeben der Stärke 6,9 ereignete sich am Montag, den 25. Mai, um 17:52 Uhr mit seinem Epizentrum 20 Kilometer nordöstlich von Calama. Das Beben war in vier nördlichen Regionen zu spüren und führte zu Stromausfällen sowie Betriebsunterbrechungen im Bergbau.

Researchers have verified a rare deep earthquake that struck beneath Utah in 1979 at a depth once thought impossible for such events under continents. New analysis of old data and a 2025 quake support the existence of continental mantle earthquakes.

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Researchers have identified natural barrier zones on an underwater fault that act as brakes to stop earthquakes from growing larger. The findings come from detailed studies of the Gofar transform fault off Ecuador.

Researchers have developed a three-dimensional model showing that a broad eastward-moving mantle wind supplies magma to Yellowstone rather than a deep plume from Earth's core.

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A new study finds that tectonic stress along Southern California's San Andreas and San Jacinto faults has reached levels unseen in the past millennium. Researchers identified Cajon Pass as an earthquake gate that could allow a rupture to spread across both systems. The findings, based on a physics-based model, highlight conditions that historically preceded major multi-fault events.

Scientists have captured the first clear images of a subduction zone breaking apart beneath the Pacific Northwest. The Juan de Fuca plate is splitting into fragments as it sinks under the North American plate. The findings, from a 2021 seismic experiment, reveal a gradual tearing process.

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