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. The crust, on which we live is merely 
1/n
Tomographic and volcanotectonic control on the 2021–2023 Fagradalsfjall eruptions, Iceland https://www.byteseu.com/1005516/ #Geophysics #HumanitiesAndSocialSciences #Iceland #multidisciplinary #NaturalHazards #Science #seismology #Volcanology
Energy from the depths of the Earth: Collaborative research project studies temperature-induced change of rocks in geothermal reservoirs / Geothermal energy as a major driver in the energy revolution / German Federal Ministry for Economic Affairs and Energy provides funding for research on small-scale processes in rocks for deep #GeothermalReservoirs 
https://press.uni-mainz.de/energy-from-the-depths-of-the-earth-collaborative-research-project-studies-temperature-induced-change-of-rocks-in-geothermal-reservoirs/
4 years ago this month... leaving Kronprins Haakon for a day of ski touring with a GEM2 electromagnetic sounder and a Magnaprobe.
Polona Itkin (then UiT, now NPI) is in frame doing the work, I'm on bear watch for this session (skiing in company with a rifle and rescue pack). We had our small battles, and ultimately were a great team! I'm glad she's found a permanent role doing this stuff.
Thread about sea ice, safety, perceptions and realities incoming....
On the Mechanics of Wet Sand
Sand is a critical component of many built environments. As most of us learn (via sand castle), adding just the right amount of water allows sand to be quite strong. But with too little water — or too much — sand is prone to collapse. For those of us outside the construction industry, we’re most likely to run into this problem on the beach while digging holes in the sand. In this Practical Engineering video, Grady explains the forces that stabilize and destabilize piled sand and where the dangers of excavation lie. (Video and image credit: Practical Engineering)
This depiction of a subducted slab at the core mantle boundary bulldozing material ahead of it and lifting the edge of the Pacific low velocity province is quite cool!
Just have to remember that what you see does depend on your seismic data selection and processing choices, and particularly the reference model you use to define "normal" mantle.
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024JB030654
Our own @BaerbelW traveled to Vienna for this year's #EGU25 General Assembly of the @EuroGeosciences
Baerbel herself did a couple of presentations in Vienna:
* Examples of Skeptical Science successfully collaborating with other organizations so as to better reach shared goals, get more gain for less effort. With so much reward, we're eager to do more.
* How Skeptical Science translates our content into 29 different languages, the challenges of maintaining a polyglot presence. You may be able to help!
Baerbel also kept a daily journal. It's loaded with links to scads of intriguing information presented at the assembly by many researchers, with teasers and organized for easy access.
Post facto virtual attendance , distilled and at our fingertips. :-)
Martian Mud Volcanoes
Mars features mounds that resemble our terrestrial mud volcanoes, suggesting that a similar form of mudflow occurs on Mars. But Mars’ thin atmosphere and frigid temperatures mean that water — a prime ingredient of any mud — is almost always in either solid or gaseous form on the planet. So researchers explored whether salty muds could flow under Martian conditions. They tested a variety of salts, at different concentrations, in a low-pressure chamber calibrated to Mars-like temperatures and pressures. The salts lowered water’s freezing point, allowing the muds to remain fluid. Even a relatively small amount of sodium chloride — 2.5% by weight — allowed muds to flow far. The team also found that the salt content affected the shape the flowing mud took, with flows ranging from narrow, ropey patterns to broad, even sheets. (Image credit: P. Brož/Wikimedia Commons; research credit: O. Krýza et al.; via Eos)
I believe is customary re-post an introduction after moving instances... so here's mine:
Software engineer working in #geophysics. #8bit hacker in the 80s, #16bit hobbyist in the early 90s before finding my home on #unix and finally #linux. Author of a few simple open source utilities with zero users.
tech: #dragon32 #samcoupe #amiga #rust #python #neovim #debian #nixos
non-tech: #cycling #guitar #astronomy
Fabian Benedict is actually responsible for #geophysics at Novetus. But for the #excavation of the #Roman mass grave in #Hasenleitengasse, he left his high-tech tools behind and swapped them for a hoover.
#archaeology #romanarchaeology #anthropology #Vienna #Wien #Austria
On Monday: Master's thesis defense: Stefan Blochberger:
Joint 3D surface and subsurface imaging for geophysical archaeological prospection #geophysics
https://www.tuwien.at/en/mg/geo/events/event-details/news/masters-thesis-defense-stefan-blochberger
Bifurcating Waterways
Your typical river has a single water basin and drains along a river or two on its way to the sea. But there are a handful of rivers and lakes that don’t obey our usual expectations. Some rivers flow in two directions. Some lakes have multiple outlets, each to a separate water basin. That means that water from a single lake can wind up in two entirely different bodies of water.
The most famous example of these odd waterways is South America’s Casiquiare River, seen running north to south in the image above. This navigable river connects the Orinoco River (flowing east to west in this image) with the Rio Negro (not pictured). Since the Rio Negro eventually joins the Amazon, the Casiquiare River’s meandering, nearly-flat course connects the continent’s two largest basins: the Orinoco and the Amazon.
For more strange waterways across the Americas, check out this review paper, which describes a total of 9 such hydrological head-scratchers. (Image credit: Coordenação-Geral de Observação da Terra/INPE; research credit: R. Sowby and A. Siegel; via Eos)
Energy Flow and Earth: How Earth Works by John A. Whitehead, 2024
This book shows how energy flow plays a major role in: plate tectonics; the formation of continents; ocean basins; and building mountains. Energy flow also produces and drives volcanos, Earth’s magnetic field, the wind belts, our weather, and ocean circulation.
Chapter abstracts:
https://link.springer.com/book/10.1007/978-3-031-62694-4
@bookstodon
#books
#nonfiction
#geology
#geophysics
#EarthScience
#Earth
#energy
On this day in 1906: The #SanFrancisco #earthquake struck with devastating force, changing our understanding of seismic activity and launching new scientific inquiries. Yet even with today's advanced #technology, accurately predicting earthquakes remains one of #science's most persistent challenges. 
Learn more: https://thekidshouldseethis.com/post/why-are-earthquakes-so-hard-to-predict
**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). https://doi.org/10.1038/s41598-018-19446-3.
#OpenAccess #OA #Article #DOI #Geology #Geomorphology #Geophysics #Sedimentology #Flood #Mediterranean #Academia #Academics @geology
Arctic Melt
Temperatures in the Arctic are rising faster than elsewhere, triggering more and more melting. Photographer Scott Portelli captured a melting ice shelf protruding into the ocean in this aerial image. Across the top of the frozen landscape, streams and rivers cut through the ice, leading to waterfalls that flood the nearby ocean with freshwater. This meltwater will do more than raise ocean levels; it changes temperature and salinity in these regions, disrupting the convection that keeps our planet healthy. (Image credit: S. Portelli/OPOTY; via Colossal)
https://www.europesays.com/uk/10447/ Earth’s Magnetic Field Can Generate Power #geophysics #MagneticField #Physics #RenewableEnergy #Science #UK #UnitedKingdom
9-month Geo position at Skidmore: earth materials, geophysical methods, intro. "Expertise in any of the following areas is desirable: #petrology, #mineralogy, #geophysics, tectonics, Earth history, and related fields." 
#geology
https://eodq.fa.us6.oraclecloud.com/hcmUI/CandidateExperience/en/sites/CX/job/2579
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)
