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The shape and internal structure of bilobate comet 67P is controlled by mechanically driven erosion of shear fracture networks, according to a three-dimensional analysis of images from the Rosetta mission. The image shows the Jupiter-family comet 67P/Churyumov–Gerasimenko.
Two tsunamis generated by distinct geohazards struck Indonesia within six months and killed thousands. Early-warning systems established after 2004 have not prevented devastation.
A magnitude 7.5 strike-slip earthquake that struck Palu, Indonesia, in 2018 unexpectedly generated a devastating tsunami. Seismic data reveal that its rupture propagated fast, at supershear speed. Whether the two are connected remains to be seen.
A chemically distinct region separates the Indian and Pacific mantle domains as revealed by isotope analyses on rare samples from the Australian–Antarctic Ridge.
The shape and internal structure of bilobate comet 67P is controlled by shear deformation inducing mechanically driven erosion along shear fracture networks, according to a 3D analysis of images from the Rosetta mission.
Stratocumulus cloud decks—which cool the Earth’s surface by shading it from sunlight, and are prevalent in the subtropics—break up into scattered clouds when CO2 levels rise above 1,200 ppm in large-eddy simulations that explicitly resolve cloud dynamics.
The ice volume of glaciers outside the Greenland and Antarctic ice sheets totals about 158,000 km3, with about 27% less ice in High Mountain Asia than thought, according to multiple models that estimate ice thickness from surface characteristics.
Tropical forests and savannah are more resilient to climate disturbances when they have been exposed to higher rainfall variability in the long-term past, finds an analysis of Brazilian rainfall and tree-cover observations.
Many lakes in arid, organic-poor permafrost landscapes have a negligible role in mineralizing terrestrial carbon, according to metabolic analyses of lakes in the arid Yukon Flats Basin.
Before the Great Oxidation Event there was regional-scale, full water-column oxygenation above the continental shelf, according to molybdenum and thallium isotope records that indicate massive manganese oxide burial.
A separate mantle domain, distinct from both the Pacific and Indian domains, exists beneath the Southern Ocean, according to isotope compositions of samples from the Australian–Antarctic ridge.
Melting of sedimentary rocks in the continental back-arc is cyclical with peaks of magmatism every 10 to 15 million years, according to zircon ages from Paleozoic western Gondwana margin samples.