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Planet Earth

All articles tagged with #planet earth

planet-earth1 day ago

Cracking the Seismic Code: Parkfield's Forecast and the Quest for a Crystal Ball

The piece examines why predicting earthquakes is so challenging, using California’s Parkfield Experiment on the San Andreas Fault as a focal point. Although scientists predicted a quake between 1985 and 1993, a magnitude-6.0 event occurred in 2004—11 years later—highlighting the inherent uncertainty of fault behavior. The article explains how fault geometry, subsurface properties, and limited historical data complicate forecasts, while noting advances in hazard maps, sensor networks, InSAR, GPS, and AI that improve risk assessment and move toward a practical (though not perfectly precise) seismic 'crystal ball.'

planet-earth1 day ago

Antarctica’s A23a Iceberg Fades into Blue Patches as Four-Decade Voyage Ends

Satellite imagery shows A23a, once the world’s largest iceberg, shrinking and turning into a bright blue, patchy “blue mush” as it disintegrates after roughly 40 years at sea. Born from Antarctica’s Filchner-Ronne Ice Shelf in 1986, it became stuck on the seafloor, broke away in 2020, drifted through currents toward South Georgia, and then broke apart in 2024–2025. The blue striations are melt ponds forming in cracks and ponds on the surface, a sign of rapid disintegration that may already be fading in newer photos; with A23a waning, D15A is cited as the current largest iceberg.