tldrdailynews.com logo
Tag

Geophysics

All articles tagged with #geophysics

Three Gorges Dam Tiny Spin: NASA Calculations Show Subtle Shift in Earth's Rotation
science11 days 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
Humans Are Lengthening Earth's Day, New Study Finds
science16 days ago

Humans Are Lengthening Earth's Day, New Study Finds

Researchers show Earth's day is lengthening by about 1.33 milliseconds per century due to climate-driven mass shifts from melting ice, using fossil foraminifera and a physics-informed deep learning model; the trend could soon surpass the Moon's influence, with implications for communications and space navigation, per a Journal of Geophysical Research: Solid Earth study.

via ScienceAlert|
#climate-change#earth-rotation#foraminifera
Underground Freshwater Vault Discovered Beneath Great Salt Lake
science17 days ago

Underground Freshwater Vault Discovered Beneath Great Salt Lake

Researchers using airborne electromagnetic surveys and magnetic data mapped beneath Utah’s Great Salt Lake and uncovered a large, previously unknown freshwater reservoir that extends deep into the basin, challenging the idea that the lake is fully saline. The find suggests mountain-fed freshwater can infiltrate far beneath the surface and may offer new options for drought and dust mitigation, though surveys are incomplete and sustainable use requires caution; the study, published in Scientific Reports, emphasizes the need to survey the entire lake to determine the reservoir’s true extent.

via Indian Defence Review|
#freshwater#geophysics#great-salt-lake
Hidden mantle blobs could rewrite Earth's tectonic story
science1 month ago

Hidden mantle blobs could rewrite Earth's tectonic story

Seismologists using high-resolution full-waveform inversion on earthquake data detected large, anomalous pockets in the lower mantle beneath the Pacific, visible as regions where seismic waves move unusually fast or slow. These “sunken worlds” may be remnants of ancient plates or other mantle materials, challenging traditional ideas about subduction and plate evolution. A ETH Zurich–Caltech team notes the exact composition is unclear and more data and methods (including EM signals and mineral physics) are needed, but the findings could require updates to models of mantle convection and heat transfer. The study appears in Scientific Reports.

via Earth.com|
#full-waveform-inversion#geophysics#mantle
Antarctica’s Gravity Hole Grows Stronger, Hinting at Deep Mantle Shifts
earth-science1 month ago

Antarctica’s Gravity Hole Grows Stronger, Hinting at Deep Mantle Shifts

Scientists used earthquakes and geophysical data to reconstruct Earth’s interior and map a gravity hole beneath Antarctica that began weakening but has grown stronger over roughly 50–30 million years, driven by competing mantle flows (cold, sinking material beneath and hotter, rising material above). This amplified mass deficit alters the geoid and regional sea-level dynamics, offering clues about ice-sheet stability and climate-related sea-level changes, though the exact future impact remains uncertain.

via Gizmodo|
#antarctica#earth-science#geophysics
Scientists Discover Unprecedented Massive Structure Beneath Bermuda
science3 months ago

Scientists Discover Unprecedented Massive Structure Beneath Bermuda

Bermuda's unique geological structure is explained by a 20-kilometer-thick, less dense mantle layer beneath it, which acts like a mantle plume, despite Bermuda lacking recent volcanic activity or typical plume features. This discovery challenges existing models of mantle plumes and suggests Bermuda is supported by an unusual mantle layer, possibly due to its geological history or composition.

via IFLScience|
#bermuda#geophysics#mantle-layer
Scientists Detect Massive Internal Shift Within the Earth
science6 months ago

Scientists Detect Massive Internal Shift Within the Earth

Scientists analyzing data from NASA's GRACE satellites discovered evidence of a massive shift deep within the Earth's interior near the core-mantle boundary, possibly caused by changes in mantle minerals like perovskite, which may have influenced Earth's magnetic field and caused a geomagnetic jerk around 2007. They plan to use data from the follow-up GRACE-FO mission to further investigate these deep Earth processes.

via Futurism|
#core-mantle-boundary#earths-interior#geomagnetic-field