ourselves.space

55d

Edge Of Mars’ Great Dichotomy Eroded Back By Hundreds Of Kilometres
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https://arstechnica.com/science/2025/01/field-of-mounds-on-mars-may-be-sign-of-erosion-at-the-edge-of-an-ocean/ <-- shared technical article
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http://dx.doi.org/10.1038/s41561-024-01634-8 <-- shared paper
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#GIS #spatial #mapping #planet #Mars #remotesensing #imagery #landsurface #geology #topography #astrogeology #elevation #morphology #martian #geography #marsdichotomy #plateau #lowlands #model #3dmodel #basin #highlands #shoreline #ocean #crust #structuralgeology #chemostratigraphy #morphostratigraphy #geomorphometry #geomorphology #water #hydrology #CaSSIS #HiRISE #stratigraphy #strata #MOLA #laser #LiDAR #MawrthVallis #crater #mound #profile #crosssection #geochemistry #mineralogy #CRISM #CTX #HRSC #DTM #erosion #weathering #spatialanalysis #spatiotemporal

images - Morphological similarities between the stratigraphy in the mounds and the Mawrth Vallis plateau region

Edited 55d ago

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135d

The technical term for this is "mushroom rock". #geology #geomorphology

A rock sticking out of the water. The bottom has been wave eroded, so it looks like a mushroom.

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135d

I found the beachrock in Okinawa. It forms from bacteria that feed on urea! They secrete a carbonate cement. #geology #geomorphology

In the foreground is the beachrock. Further out is a chunk of bedrock with a wave cut notch. To the left is the ocean.

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167d

New Explanation For Siberia’s Permafrost Craters
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https://news.agu.org/press-release/new-yamal-craters-explanation/ <-- shared technical article
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https://doi.org/10.1029/2024GL108987 <-- shared paper
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"KEY POINTS
• Surface ice-melt water can migrate downward driven by the osmotic pressure associated with a cryopeg, a lens of salty water below
• Overpressure can cause the frozen soil to crack resulting in mechanical explosion.."
#permafrost #hydrates # Russia #YamalPeninsula #BatagaikaCrater #Siberia #climatechange #geomorphology #mechanism #process #climatechange #methane #thawing #frozen #soil #Yamal #Taymyr #cryopeg #ice #water #hydrology #infiltration #osmotic #pumping #explosion #greehousegas

schematics - Warming causes melting in the active layer, which expands deeper into the permafrost. Meltwater then enters the salty cryopeg through osmosis, causing the expansion of the cryopeg, which cracks the overlying permafrost. When those cracks reach the surface, the rapid decrease in pressure in the cryopeg damages the methane hydrates below and triggers a rapid physical explosion. Images not to scale.

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183d

Will you join the annual meeting of the German Society for #Geomorphology (#DGGM) in #Leipzig? If yes, let's have a chat!

I'll be there to present paleo-ecological evidence for impacts of #indigenous land use practices on #wildfires in eastern Siberia - and I'm happy to see that mine won't be the only #paleofire contribution! 🔥

@paleofire @wildfirescience @ecology

https://www.physes.uni-leipzig.de/en/dggm-2024

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196d

Late to the party, but the 'Your Name in Landsat' website is super cute.

https://landsat.gsfc.nasa.gov/apps/YourNameInLandsat-main/

#landsat #geomorphology #SciComm

A series of satellite images from the landsat project, where geomorphological features look like letters, spelling out my name (Micha)

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210d

If you are interested in the idea of reconstructing past sea level using beach ridges, have a look at our new #preprint, led by Alessio Rovere, where we attempt to find the indicative meaning of these landforms, with reference to a site in Patagonia, Argentina. It has photographic proof that I, the modeller, sometimes go out into the field. ;) #SeaLevel #Paleoclimate #geomorphology https://eartharxiv.org/repository/view/7534/