tldrdailynews.com logo
Tag

Geophysics

All articles tagged with #geophysics

Mars's Hidden Magma Seas Could Have Built a Habitable Past
space10 days ago

Mars's Hidden Magma Seas Could Have Built a Habitable Past

NASA's InSight seismic data reveal a deep crustal boundary on Mars formed by vast magma pools, suggesting the crust differentiated into mafic and ultramafic layers and implying interconnected, long-lived magmatic systems beneath the planet. This transcrustal magmatism could have reprocessed mantle material, releasing greenhouse gases and thickening the early atmosphere to sustain warmer conditions, potentially making Mars habitable in its past, while also hinting at near-surface mineral wealth.

via Space|
#geophysics#habitability#insight
Earth’s inner core slows and drifts backward in a 70-year seismic rhythm
science10 days ago

Earth’s inner core slows and drifts backward in a 70-year seismic rhythm

Seismic data indicate Earth's solid inner core, long spinning slightly faster than the surface, slowed to match the surface around 2009–2010 and has since fallen behind, effectively drifting backward relative to the rest of the planet. The motion is a relative one (to the mantle) and likely part of a ~70-year oscillation that also influences length of day and the magnetic field; the evidence is indirect and debated, with ongoing work to confirm the oscillation model over the coming decade.

via Space Daily|
#earth-rotation#geophysics#inner-core
Antarctica Unveils Continent-Sized Subsurface Enigma
science26 days ago

Antarctica Unveils Continent-Sized Subsurface Enigma

Scientists have identified a vast subsurface feature beneath Antarctica described as a continent-sized megastructure, revealed through new geophysical imaging (radar and seismic data). The discovery could reshape understanding of the continent’s geology and influence models of ice dynamics and past climate, with ongoing research to determine its origin and nature.

via Yahoo|
#antarctica#geology#geophysics
Indian Plate Peels Apart Under Tibet, Redrawing Himalayan Tectonics
discoveries1 month ago

Indian Plate Peels Apart Under Tibet, Redrawing Himalayan Tectonics

New seismic evidence shows the Indian Plate beneath southern Tibet is peeling away and tearing, with delamination of the mantle lithosphere and a tear likely forming a patchwork beneath the Himalayas and Tibetan Plateau. By combining S-receiver functions and shear-wave splitting across thousands of stations, researchers map two mantle domains and surface gas signals that hint at mantle sources. The work challenges the classic single-slab view of continental collision and highlights deep Earth processes that shape mountain building and earthquake hazards in Asia.

via The Brighter Side of News|
#continental-collision#discoveries#earthquakes
Pacific core-flow reversal reveals hidden shifts in Earth's interior
science1 month ago

Pacific core-flow reversal reveals hidden shifts in Earth's interior

A study using satellite data from Swarm, CryoSat, CHAMP and Ørsted shows a broad region of iron-rich fluid in Earth's outer core beneath the equatorial Pacific reversed its flow from westward to eastward in 2010, challenging the view of steady westward drift and prompting questions about the core's dynamics and its link to geomagnetic changes. Ongoing monitoring will determine whether this is a short-term wobble, part of a cycle, or a new stable state; while not dangerous itself, such deep interior shifts can influence Earth's magnetic field and technology that relies on it.

via Earth.com|
#geomagnetism#geophysics#outer-core
Pacific Core Flow Reversal Reveals Dynamic Earth
science1 month ago

Pacific Core Flow Reversal Reveals Dynamic Earth

Satellite data from 1997–2025 show a portion of Earth's outer core beneath the Pacific reversed its flow from westward to eastward between 2010 and 2012, strengthening through 2020 before weakening again and accounting for about 5% of the outer-core surface flow. This hints that the deep interior is more dynamic than previously thought and may be linked to later geomagnetic jerks; improving our understanding of the geodynamo helps forecast the magnetic field and space weather.

via ScienceAlert|
#earth-science#geodynamo#geomagnetism
Deep-Earth Plume Solves 75-Year Indian Ocean Gravity Puzzle
science1 month ago

Deep-Earth Plume Solves 75-Year Indian Ocean Gravity Puzzle

New mantle-convection modeling links the Indian Ocean geoid low to a hidden hot mantle plume rising from Africa and traveling beneath the Indian Ocean, creating a mass deficit that weakens gravity in the region; the findings align with satellite data and illuminate deep-Earth processes, though uncertainties remain about ancient plate motions and plume dynamics.

via Indian Defence Review|
#african-superplume#auto#geoid-low
Ancient Taftan Volcano Signals a Quiet Wake-Up with Satellite-Detected Uplift
environment1 month ago

Ancient Taftan Volcano Signals a Quiet Wake-Up with Satellite-Detected Uplift

Satellite data show Taftan, a remote volcano in southeastern Iran, has risen about 9 cm in 10 months, signaling pressure buildup near the summit in a shallow hydrothermal/magmatic system. The uplift, centered near the summit, likely reflects gas and fluids moving through cracks rather than magma reaching the surface, so eruption is not imminent but ongoing monitoring is essential. Authorities should track gas emissions, install a basic seismic/GPS network, and update hazard maps while satellites continue to monitor.

via Earth.com|
#environment#geophysics#insar
Volcano Forecasting: The Quest for Weather‑Style Warnings
science2 months ago

Volcano Forecasting: The Quest for Weather‑Style Warnings

Scientists are inching toward weather‑style forecasts for volcanic eruptions, but predicting eruptions with that level of certainty remains challenging because magma sits deep and each volcano is unique. Advances in seismology, ground deformation monitoring, gas measurements, and machine learning are enabling earlier warnings and more detailed volcano models. Projects like Ex-X and SZ4D seek to uncover the governing physics, improve data collection, and develop archetype volcano models that could one day output probabilistic eruption forecasts days or weeks in advance, but achieving a generalized, reliable forecast will require decades of data and a far more extensive global monitoring network.

via Quanta Magazine|
#eruption-forecasting#geophysics#hazard-mitigation
Pacific Ocean Drains Heat Faster, Revealing 400 Million-Year Cooling Imbalance
science2 months ago

Pacific Ocean Drains Heat Faster, Revealing 400 Million-Year Cooling Imbalance

A 400-million-year computer-model study shows Earth's cooling is uneven: the Pacific hemisphere has shed about 50 Kelvin more heat than Africa, driven by rapid heat loss through the thinner seafloor and the vast Pacific Ocean, while continental regions trap heat; the findings illuminate a long-standing hemispheric heat disparity rooted deep in Earth's tectonic history.

via Indian Defence Review|
#earth-science#geophysics#heat-flow
Three Gorges Dam Tiny Spin: NASA Calculations Show Subtle Shift in Earth's Rotation
science3 months ago

Three Gorges Dam Tiny Spin: NASA Calculations Show Subtle Shift in Earth's Rotation

NASA scientists calculated that filling the Three Gorges Dam reservoir would lengthen the length of day by about 0.06 microseconds and shift Earth’s pole by roughly 2 centimeters due to moving 40 cubic kilometers of water higher up; the effect is minuscule compared with the Moon’s tidal slowing and other mass redistributions such as groundwater pumping and ice melt. It’s a real but negligible physical consequence of large-scale engineering, not a weapon or warning.

via The Daily Galaxy|
#earth-rotation#geophysics#mass-redistribution