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#geophysics

2 posts2 participants0 posts today
Public
Bibliolater 📚 📜 🖋

🔴 **Evidence of the Zanclean megaflood in the eastern Mediterranean Basin**

“_Our findings provide evidence for a large amplitude drawdown in the Ionian Basin during the MSC, support the scenario of a Mediterranean-wide catastrophic flood at the end of the MSC, and suggest that the identified sedimentary body is the largest known megaflood deposit on Earth._”

Micallef, A., Camerlenghi, A., Garcia-Castellanos, D. et al. Evidence of the Zanclean megaflood in the eastern Mediterranean Basin. Sci Rep 8, 1078 (2018). doi.org/10.1038/s41598-018-194.

#OpenAccess #OA #Article #DOI #Geology #Geomorphology #Geophysics #Sedimentology #Flood #Mediterranean #Academia #Academics @geology

Public
Nicole Sharp

Reclaiming the Land

Lava floods human-made infrastructure on Iceland’s Reykjanes peninsula in this aerial image from photographer Ael Kermarec. Protecting roads and buildings from lava flows is a formidable challenge, but it’s one that researchers are tackling. But the larger and faster the lava flow, the harder infrastructure is to protect. Sometimes our best efforts are simply overwhelmed by nature’s power. (Image credit: A. Kermarec/WNPA; via Colossal)

Aerial view of lava overflowing a road and the surrounding landscape in Iceland.
#fluidDynamics#fluidsAsArt#geophysics
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💧🌏 Greg Cocks

Grfin Tools—User Guide And Methods For Modeling Landslide Runout And Debris-Flow Growth And Inundation
--
pubs.usgs.gov/publication/tm14 <-- shared USGS publication
--
code.usgs.gov/grfintools/grfin <-- shared USGS software release
--
H/T Jonathan Perkins USGS
[ another open source resource for everyone from the USGS ~smile~ ]
#GIS #spatial #mapping #opensource #openlibrary #Grfin #software #package #regional #debrisflow #engineeringgeology #geology #inundation #spatialanalysis #spatiotemporal #geophysics #geophysical #massmovement #landslide #lahar #volcano #rock #avalanche #model #modeling #statistical #geostatistics #water #hydrology #downstream #elevation #remotesensing #DEM #flow #runout #risk #hazard #tools #slope #erosion #drainage #network #channel #channelisation #userguide
@USGS

screen shot - grfintools software repository home page (https://code.usgs.gov/grfintools/grfintools)
report figure 2 - Schematic flowchart illustrating common pathways for using Grfin Tools with examples identified in orange boxes
report figure 1 - Perspective view of topography illustrating the potential locations for three types of mass movements that can be derived from a Grfin Tools analysis.
USGS report cover page - Grfin Tools—User Guide And Methods For Modeling Landslide Runout And Debris-Flow Growth And Inundation
Public
Project Gutenberg

Danish seismologist and geophysicist Inge Lehmann died #OTD in 1993.

She is best known for her discovery in 1936 of the solid inner core that exists within the molten outer core of the Earth. The seismic discontinuity in the speed of seismic waves at depths between 190 and 250 km is named the Lehmann discontinuity after her. Lehmann is considered to be a pioneer among women and scientists in seismology research.

en.wikipedia.org/wiki/Inge_Leh

Lehmann in 1932. Image courtesy The Royal Library, National Libary of Denmark and University of Copenhagen University Library, under a Creative Commons License. Even Neuhaus (6.2.1863-20.4.1946) - http://www5.kb.dk/images/billed/2010/okt/billeder/object11164/da/ The photograph is sepia-toned and features Lehmann with a composed expression, wearing a modest dark jacket over a white blouse. Her hair is neatly pulled back, and she has a serious, determined gaze. The signature "Marthæus 1932" is visible in the lower right corner.
#seismology#geophysics#womeninStem
Public
Julian Oliver

It appears that melting Antarctic sheets may result in larger volcanic eruptions This is due to the unloading of ice mass shifting pressure across vast chambers of magma.

"The researchers note that even if anthropogenic warming ceased immediately, the effects of ice mass unloading that the West Antarctic Rift System has already experienced will still affect volcanic behavior here for thousands of years to come."

phys.org/news/2025-01-antarcti

Phys.org · Melting Antarctic ice sheets may be causing larger volcanic eruptionsBy Hannah Bird
#climatechange#geophysics#fossilfuels
Public
Jeroen Ruigrok van der Werven

New Study Uncovers Key Error in Climate Models: Earth’s Albedo Overestimated

"But with the new ice reflectivity incorporated into the model, the Greenland Ice Sheet is melting at a rate of about six gigatons more than in older model versions. This is based on albedo measurements that are more consistent with satellite observations."

scitechdaily.com/new-study-unc

SciTechDaily · New Study Uncovers Key Error in Climate Models: Earth’s Albedo OverestimatedTheir revision incorporates the impact of previously neglected physical properties in ice. As global temperatures rise due to human-induced climate change, precise computerized climate models will be crucial in shedding light on how our climate will continue to evolve in the coming years. In a s
#ClimateChange#Geophysics
Public
Dr. Evan J. Gowan

Swierczek-Jereczek present FastIsostacy, a program that can calculate glacial isostatic adjustment that accounts for lateral variability of the Earth. This is a great advance for ice sheet modelling, though I feel their lament that more complicated codes are not yet available despite several decades of development. #IceSheets #Geology #Geophysics gmd.copernicus.org/articles/17

gmd.copernicus.orgFastIsostasy v1.0 – a regional, accelerated 2D glacial isostatic adjustment (GIA) model accounting for the lateral variability of the solid EarthAbstract. The vast majority of ice-sheet modelling studies rely on simplified representations of the glacial isostatic adjustment (GIA), which, among other limitations, do not account for lateral variations in the lithospheric thickness and upper-mantle viscosity. In studies of the last glacial cycle using 3D GIA models, this has however been shown to have major impacts on the dynamics of marine-based sectors of Antarctica, which are likely to be the greatest contributors to sea-level rise in the coming centuries. This gap in comprehensiveness is explained by the fact that 3D GIA models are computationally expensive, rarely open-source and require a complex coupling scheme. To close this gap between “best” and “tractable” GIA models, we propose FastIsostasy here, a regional GIA model capturing lateral variations in the lithospheric thickness and mantle viscosity. By means of fast Fourier transforms and a hybrid collocation scheme to solve its underlying partial differential equation, FastIsostasy can simulate 100 000 years of high-resolution bedrock displacement in only minutes of single-CPU computation, including the changes in sea-surface height due to mass redistribution. Despite its 2D grid, FastIsostasy parameterises the depth-dependent viscosity and therefore represents the depth dimension to a certain extent. FastIsostasy is benchmarked here against analytical, as well as 1D and 3D numerical solutions, and shows good agreement with them. For a simulation of the last glacial cycle, its mean and maximal error over time and space respectively yield less than 5 % and 16 % compared to a 3D GIA model over the regional solution domain. FastIsostasy is open-source, is documented with many examples and provides a straightforward interface for coupling to an ice-sheet model. The model is benchmarked here based on its implementation in Julia, while a Fortran version is also provided to allow for compatibility with most existing ice-sheet models. The Julia version provides additional features, including a vast library of adaptive time-stepping methods and GPU support.
Public
Ele Willoughby, PhD

Happy birthday to Danish #seismologist Inge Lehmann (1888 – 1993) who demonstrated that the Earth's core is not a single molten sphere, but contained an inner solid core, in ‘36. She was a pioneer #womanInScience, a brilliant seismologist & lived to be 105.⁠
⁠
As she first postulated, the #earth has roughly 3 equal concentric sections: mantle, liquid outer core & solid inner core. 🧵1/n

Square linocut print on white paper of seismologist Inge Lehmann in a fur coat, silk scarf and dapper hat, in dark grey-teal ink overprinted with her diagram of the cross-section of the Earth in orange and red from her P’ paper, showing the mantle, outer core and inner core, an earthquake epicentre marker E and labelled ray paths through the Earth.
#printmakimg#sciArt#geophysics
Public
Daniel Pomarède

Why is Methane Seeping on Mars?

The most surprising revelation from NASA’s Curiosity Mars Rover — that methane is seeping from the surface of Gale Crater — has scientists scratching their heads.

science.nasa.gov/solar-system/

science.nasa.govWhy is Methane Seeping on Mars? NASA Scientists Have New Ideas - NASA ScienceThe most surprising revelation from NASA’s Curiosity Mars Rover — that methane is seeping from the surface of Gale Crater — has scientists scratching their heads. Living creatures produce most of the methane on Earth. But scientists haven’t found convincing signs of current or ancient life on Mars, and thus didn’t expect to find methane […]
#Mars#curiosity#rover
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Leonardo Uieda

👋🏽 Olá! I'm Leo and here is a new #introduction.

I am Professor of #Geophysics at Universidade de São Paulo, Brazil, where I study the Earth using tiny disturbances in its gravity and magnetic fields, from global 🌎 to microscopic 🔬 scale.

I create mathematical and computational tools to extract as much information as we can from these data. My entire career has revolved around #OpenSource (mainly @fatiando), #OpenScience, and #OpenEducationalResources.

Find out more: leouieda.com

Photo with a projection screen at the center (slide has a hands-up emoji and the phrase "I am a self-taugh coder") and a slightly tan man in a red shirt standing in front of the screen.
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Santiago Andrés Triana

The Earth's Free Core Nutation (#FCN) motion is essentially a slight misalignment between the mantle's spin axis and the fluid core spin axis (I greatly exaggerated it here for ease of visualization). The camera starts in an inertial reference frame and slowly moves to the mantle's frame. As seen from the mantle the core seems to wobble!
This is all caused by the Earth's slow #precession. The fluid core lags a bit resulting in a small misalignment.
#Earth #Core #Science #Geophysics #Nutation

GIF
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NABG

Hello Fediverse!

The National Association of Black Geoscientists #NABG enables black geoscientists to learn, present research, and network.

Our members are from diverse fields and backgrounds. If you are a black geoscientist or an #ally who supports our mission, follow us and become a member.

To date, we have raised over $300,000 in scholarships for aspiring black geoscientists.

#firsttoot#introductions#introduction
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