Someone, call Mario! We've sprung a leak!
#NorthAmerica is dripping from below, #geoscientists discover https://buff.ly/M7CXKiF
Phys.org · North America is dripping from below, geoscientists discover
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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.
Live Science · Study reveals 'flawed argument' in debate over when plate tectonics began
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
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/
Replied in thread
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.
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/
Last year an interesting paper linked kimberlite eruptions (weird, often diamond-bearing magmas formed by deep melting of continental lithosphere) to thermal instabilities triggered by continental rifting propagating along the base of the plate to the continental interiors, triggering melting as it goes. Now..
A community for scientists and science communicators.Chris Rowan (@allochthonous@scicomm.xyz)Attached: 1 image
Getting diamonds to Earth's surface from the depths where they form requires weird deep melting that forms kimberlites. New study suggests that most of the kimberlites over the past billion years erupted 20-30 million years after continental rifting events.
Proposed mechanism is pretty cool! Steepening of base of lithosphere during rifting creates a convective instability that propagates beneath the older cratonic keels and disrupts them, triggering melting.
#geology
https://www.nature.com/articles/s41586-023-06193-3
New research suggests a hidden force may be causing continents to rise. This discovery could revolutionize how we model Earth’s surface changes and resource distribution, offering insights into seismic activity, groundwater accumulation, and even climate shifts. Knowing how landmasses move can help predict natural events and optimize resource management. #Geology #EarthScience #Continents #Tectonics #Research
https://www.sciencefocus.com/news/mysterious-forces-are-causing-the-continents-to-rise
Repost from Adriana Guatame
(@adriguatame.bsky.social):
With #kyanite I always remember this video created by Stacey Phillips via the Mineralogical Society (the LEGO stop motion science videos)
Today’s M4.7 earthquake near Malibu was located about 10 km from a M4.6 event in February. However, today’s quake was a strike slip event, whereas the earlier earthquake occurred on a reverse fault. #earthquake #california #geology #tectonics #geoscience #seismology
An interesting attempt to work out if mineral phase changes at higher temperatures and pressures generate a unique enough seismic signature to make any subducted continental crust* hanging around in the mantle detectable. The answer: at some depths, possibly!
Quite intrigued by hints that there may be a lot hanging around in the mantle transition zone...
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024GL111556
*yes, it can happen, if it's dragged under by a subducting oceanic slab.
The M3.5 earthquake near Ontario (and my old university Cal Poly Pomona) about an hour ago is a strike slip event, part of the Fontana trend #geology #tectonics #seismology #earthquake
Greg Cocks Witness 1.8 Billion Years Of Tectonic Plates Dance Across Earth’s Surface In A New Animation
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https://theconversation.com/witness-1-8-billion-years-of-tectonic-plates-dance-across-earths-surface-in-a-new-animation-238209 <-- shared article
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https://doi.org/10.1016/j.gsf.2024.101922 <-- shared paper
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https://youtu.be/_LJG68AmZxI?si=BBBDZg8Qn7DPy2WV <-- shared animation
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#GIS #spatial #mapping #model #modeling #geology #structuralgeology #global #earth #tectonics #tectonicplates #platetectonics #Gondwana #continents #spatiotemporal #Pangaea #Rodinia #Nuna #supercontinent #animation #video #reconstruction
We discovered a new way mountains are formed – from ‘mantle waves’ inside the Earth
https://theconversation.com/we-discovered-a-new-way-mountains-are-formed-from-mantle-waves-inside-the-earth-236910 #geology #tectonics #mantle #MountainBuilding
The ConversationWe discovered a new way mountains are formed – from ‘mantle waves’ inside the EarthMotion deep in the Earth called a mantle wave can lift up the toughest parts of our planet.
The Lamont/Grapevine #earthquake sequence keeps going strong, with 400 recorded #aftershocks so far, four of which > M4.0. Several of the largest aftershocks have a mechanism that indicates a significant component of normal faulting, in contrast to the mostly reverse mechanism of the mainshock. #geoscience #geology #seismology #tectonics
