Modelling suggests that Earth's first crust, which fractionated from a magma ocean, would have had a similar trace element composition to modern continental crust: in other words, this signature is not a reliable marker of subduction and plate tectonics on the young Earth.
Map of today’s M5.2 #earthquake near Julian in the context of regional past seismicity. This event was located near the Elsinore #fault and relatively deep at 18 km.
#julian #california #geoscience #seismology #tectonics
"The heavy meteor bombardment during this early period caused extensive disruption and recycling of the crust.
Plate tectonics may have worked in fits and starts, triggered by meteor impacts until about 3.8 billion years ago, when meteor bombardment decreased dramatically as the early Solar System’s chaos gave way to more orderly orbits."
For more insight into the tectonic background of today’s M7.7 #earthquake in Myanmar I’d recommend this blog post and the original article on extrusion tectonics. There is also a video hiding somewhere on YouTube that illustrates this experiment perfectly.
#myanmar #geology #geoscience #tectonics #geophysics
https://blogs.egu.eu/divisions/ts/2021/02/15/ts-must-read-tapponnier-et-al-1982-propagating-extrusion-tectonics-in-asia/
How Did The Great Lakes Form? Scientists Think They Figured It Out
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https://www.earth.com/news/how-did-the-great-lakes-form-surprising-new-clues-have-emerged/#google_vignette <-- shared technical link
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https://doi.org/10.1029/2024GL110777 <-- shared paper
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#geology #mapping #structuralgeology #USA #Canada #GreatLakes #NorthAmerica #CapeVerde #hotspot #tectonics #magma #Superior #Michigan #Huron #Erie #Ontario #freshwater #lake #mantle #formation #pangaea #supercontinent #remotesensing #geophysics #continent #kimberlites #seismicvelocitymodel #model #modeling #plume #lithosphere #glacial #glacier #anisotropy
Yes. There is no evidence of any magma chamber building. So, no volcanic eruption in the near term.
I made a quick #map of historical #seismicity for the region of today’s M7.6 #earthquake near the Cayman Islands. This left lateral strike slip event occurred on a #fault system that produced a few similar events in size & mechanism in the last decade.
(Good to see that USGS NEIC is still online!)
#geoscience #geology #tectonics
Can not let Santorini and the Aegean Sea get all of the attention.
Venus’ thick atmosphere holds a nitrogen puzzle: traces of an ancient world shaped by plate tectonics. New research reveals how tectonic activity may have once cycled nitrogen, hinting at a dynamic, Earth-like past before its runaway greenhouse fate. Venus may hold secrets about planetary evolution and habitability.
There Are Trails In Ireland That Have Been Certified As Part Of The International Appalachian Trail, Because They Were Formed Together During Pangea
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https://iat-sia.org/ <-- shared International Appalachian Trail home page
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https://en.wikipedia.org/wiki/International_Appalachian_Trail <-- shared Wikipedia page
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#GIS #spatial #mapping #hiking #tramping #walking #leisure #InternationalAppalachianTrail #AppalachianTrail #pangea #geology #tectonics #USA #Maine #Canada #Quebec #Newfoundland #Labrador #Greenland #Iceland #Norway #Sweden #Denmark #Scotland #NorthernIreland #Ireland #IsleofMan #Wales #UK #Britain #England #Spain #Portugal #Morocco #structuralgeology
Deep Beneath California's Sierra Nevada, Earth's Lithosphere May Be Peeling Away
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https://phys.org/news/2025-01-deep-beneath-california-sierra-nevada.html <-- shared technical article
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https://doi.org/10.1029/2024GL111290 <-- shared paper
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#GIS #spatial #mapping #geology #lithosphere #California #SierraNevada #continentalcrust #crust #mantle #foundering #remotesensing #geophysics #geophysical #earthquake #spatialanalysis #spatiotemporal #structuralgeology #earthquake #seismic #seismology #Moho #platetectonics #tectonics #shearzone #faults #faulting #seismicity #model #modeling #3dmodel
Yuji Itoh / 伊東優治
Earthquake Research Institute, University of Tokyo gave a very clever talk yesterday on using GNSS solutions every 30 minutes to constrain mm-scale slow-slip deformation in the Cascadia subduction zone. This is not RTK, but standard GNSS, coupled with seismic locations of small, short-period episodic tremors.
Thermodynamic Model Identifies How Gold Reaches Earth's Surface
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https://phys.org/news/2024-12-thermodynamic-gold-earth-surface.html <-- shared technical article
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https://doi.org/10.1073/pnas.2404731121 <-- shared paper
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#geology #structuralgeology #mantle #crust #tectonics #platetectonics #gold #preciousmetals #subduction #mantle #crust #sulfur #RingOfFire #volcano #volcanics #magma #model #modeling #trisulfur #pressure #temperature #geochemistry #subductionzone #thermodynamics
These Revolutionary Maps Are Revealing Earth’s Geological Secrets
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https://www.zmescience.com/science/tectonic-model-beatiful-new/ <-- shared technical article
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https://doi.org/10.1016/j.earscirev.2022.104069 <-- shared paper
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#GIS #spatial #mapping #tomography #geology #remotesensing #structuralgeology #plates #platetectonics #earth #global #model #modeling #opendata #opensource #spatialdata #vector #platemodel #mechanics #GPS #earthquakes #volcanoes #topography #orogeny #tectonics #spatiotemporal #spatialanalysis #Pangea #Gondwana #Gondwanaland #ReuniteGondwanaland #Laurasia #lithosphere #crust #mantle #core #geophysics #geochemistry #geochronology #dating #Mesoproterozoic
Satellites Reveal Stunningly Detailed Maps Of Earth's Seafloors
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https://www.livescience.com/planet-earth/rivers-oceans/satellites-reveal-stunningly-detailed-maps-of-earths-seafloors <-- shared technical / media article
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https://swot.jpl.nasa.gov/ <-- SWOT home page
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https://doi.org/10.1126/science.ads4472 <-- shared paper
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#GIS #spatial #mapping #remotesensing #satellite #SWOT #NASA #marine #global #tectonics #geology #underwater #structuralgeology #currents #ocean #oceansurface #gravity #hills #volcanoes #tectonicplates #abyssal #ridges #geology #model #seamounts #continentalmargins #oceancurrents #nutrienttransport #seawater #geologichistory #altimetry #gravimetry #VGG #topography #radaraltimetry #global #seafloor #marine
Reconnaissance geologic mapping has bounded the mainly submerged eighth continent "Zealandia." This is pretty geeky geology stuff. The linked article explains in layman's terms but includes a link to the technical paper. The field methods and the analytical methods used to classify age date are really interesting. Geeky basic geology lab stuff like looking at thin sections, heavy mineral separation, etc. #geology #tectonics #earth #science #Zealandia #NewZealand
https://www.msn.com/en-us/news/technology/earth-s-hidden-eighth-continent-is-no-longer-lost/ar-AA1voZB7?ocid=nl_article_link
I am very happy to share this new paper led by Cécile Figus, which shows the very complex relationship between #diatom prevalence in #Paleogene epicontinental seas, #tectonics, and global #climate.
https://cp.copernicus.org/articles/20/2629/2024/
Greg Cocks 
