Wednesday, October 20, 2021
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Subduction zones occur where one tectonic plate dives under another. New computer modeling by Magali Billen, professor of earth and planetary sciences at UC Davis, shows why earthquakes on these sinking plates cluster at certain depths and could give insight into processes deep in the Earth. (U.S. Geological Survey)
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New clues to deep earthquake mystery

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Researchers developed a technique that allows them to study the atomic arrangements of liquid silicates at the extreme conditions found in the core-mantle boundary. This could lead to a better understanding of the Earth's early molten days, which could even extend to other rocky planets. Credit: Greg Stewart/SLAC National Accelerator Laboratory
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Earth’s evolutionary tale, researchers probe materials at deep-Earth conditions

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Francis Macdonald walks along a road near Manitou Springs, Colorado, where an exposed outcrop shows a feature known as the "Great Unconformity."
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The Great Unconformity : A billion years is missing from the...

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Benjamin Johnson of Iowa State University woks at an outcrop in remote Western Australia where geologists are studying 3.2-billion-year-old ocean crust. Photo by Jana Meixnerova. Photos provided by Benjamin Johnson.
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Geologists determine early Earth was a ‘water world’ by studying exposed...

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Isobath map of the eastern Alborán basin with the volcanic edifice location. Orange lines show the main flood paths. (Image: García-Castellanos et al, 2020, Earth-Sciences Reviews)
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New pieces of evidence found in the Alborán Sea possibly related...

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Credit: University of St Andrews
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Hidden past of Earth’s oldest continents unearthed

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Satellite image of the Gibraltar Arc. Credit: NASA
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Lithospheric thickening beneath the Betics and Rif mountains pulls down the...

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A schematic summary of the effect of the convergence rate. Upper image shows a slow convergence rate allows thermal difussion and a derived reduction of slab's density (positive buoyancy). Lower image shows how a faster convergence rate increases the slab's density promoting the negative buoyancy. Credit: Kittiphon Boonma, Scientific Reports
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Study explores the density of the tectonic plates and why they...

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The deep structure of the continent Antarctica. Credit: Planetary Visions (credit: ESA/Planetary Visions)
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The Antarctic: Data about the structure of the icy continent

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Reconstructed paleo-elevation in southwestern North America at the Late Eocene (36 million years ago). Credit: Bahadori and Holt
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New geologic modeling method explains collapse of ancient mountains in American...

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Earth
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Telescopes and satellites combine to map entire planet’s ground movement

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Images of the numerical solution at the moment when a supercontinent (left, in purplish grey) begins to break up. In the image on the left, the modelled fictional planet looks much like the Earth: its surface and mantle move spontaneously, at speeds close to those observed on Earth. The distribution of the plates (some of which are large, while many are small) is also similar, as is the topography: red hues represent shallow regions of the ocean (ridges), while blue indicates the deep seafloor. The deepest blue areas correspond to subduction trenches (where a plate is sinking into the mantle). The continents are shown in translucent white (and therefore appear purplish grey).The image on the right shows warm currents (plumes) rising from the bottom of the mantle. Credit: Nicolas Coltice
Continents

What makes the Earth’s surface move?

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A detail of the southern wall of the Las Cañadas caldera de . It is the best exposed sector of this volcanic structure. (Imagen: Joan Martí)
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Study provides new insight into the origin of Las Cañadas caldera...

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Fig. 1 Map of the 2016 Kaikōura earthquake and surrounding area. (A) Transpressional tectonic setting of the northeastern South Island of New Zealand. (B) Map of surface ruptures from the 2016 Mw 7.8 Kaikōura earthquake, shown in bold black lines with the Papatea fault in red (8, 28). Dots represent scaled relative energy release from back-projection results (15) and are colored by time since rupture onset. Mapped active faults that did not rupture during the Kaikōura event are indicated by thin black lines (28). Credit: Science Advances 02 Oct 2019: Vol. 5, no. 10, eaax5703, DOI: 10.1126/sciadv.aax5703
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Unusual fault rupture during Kaikōura quake

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Photographs of alkaline magmatic intrusions in Greenland. The region was volcanically and tectonically active around 1.2 billion years ago. Although no longer active, it is of major interest to geologists because the subsequent uplift and glacial erosion have cut deep into the rift and exposed the magma chambers that once lay well below the surface. Greenland’s magmas were sourced from a mantle that was enriched and contaminated by ancient crustal materials. Credit: University of St Andrews
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Ancient volcanoes reveal Earth’s recycled crust

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Continents breaking up and getting back together. Image credit: Naeblys / Getty Images
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Researchers uncover 2.5 billion years of Earth’s continents breaking up and...

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India , Asia
Continents

When India Slammed Into Asia

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Explosive volcanic crater (maar) with small lake at the bottom close to Dilo
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New light into the recent evolution of the African rift valley

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The central Andes Mountains and surrounding landscape, as seen in this true-color image from NASA’s Terra spacecraft, formed over the past 170 million years as the Nazca Plate lying under the Pacific Ocean has forced its way under the South American Plate. Credit: NASA
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Earth’s continental nurseries discovered beneath mountains

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Earth
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Scientists propose solution to ‘Gaia puzzle’

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