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
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.
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 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
#introduction - I'm Anya Reading - good to meet/connect!
Working on Antarctica (tectonics, ice sheet change, int. with ocean and atmosphere, inter disc. links). Focus on ground-based geophysics (esp. seismology) and compute. Professor of Geophysics at #UTAS#physics#comp_antarctic group, enabling/advocate for research, learning, #diversity in #stem.
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.
ICYMI: The abstract submission period for the 42nd Annual Technical Conference of the National Association of Black Geoscientists is open through August 1st. #NABG42
Today is #FossilFriday & I got a reminder that last year this day my humans made #trilobite#cookies. It was for a colleague's #Phd defence pawty in the #geophysics department. The cookies were a huge success 😻😹
Discovery of an Active Forearc Fault in an Urban Region: Holocene Rupture on the XEOLXELEK-Elk Lake Fault, Victoria, British Columbia, Canada
Abstract #geology#geophysics#geoscience@vickyveritas@Anthro
"Back in the 1980s, scientists made a remarkable discovery. Two gigantic, continent-sized blobs were embedded deep in the Earth. One is under Africa, and one is under the Pacific Ocean. They’re called LLSVPs, or Large Low-Shear-Velocity Provinces, and they have unusually high iron levels. The iron concentration changes the speed of seismic waves that travel through them, leading to their discovery."
P-wave from today’s (04:15:06 UTC 2024/02/25) M5.4 Kyrgyzstan-Xinjiang Border Region #earthquake recorded on my #RaspberryShake seismometer in Newcastle-under-Lyme, England #geophysics
P-wave from today’s (07:12:47 UTC 2024/03/29) M5.8 Southern Greece #earthquake recorded on my #RaspberryShake seismometer in Newcastle-under-Lyme, England #geophysics
In eigener Sache: Wir haben jetzt schon 200 Follower*innen hier auf Mastodon. Schön, dass Ihr da seid 🙏🙂 Wir freuen uns weiterhin auf den Austausch hier im #Fediverse.
Hey, this article isn't terrible! I was going to be snarky, with "everyone knows this [headline]." 🙄 But everyone doesn't know this. People with some physics and geology know about Earth's lumpy gravity.