#geophysics
“Severe weather has strong interactions with the ground, but we haven’t had the capability to study the coupling between the atmosphere and the solid Earth…With this new technology, we can utilize existing fiber-optics networks to clearly see how thunderstorm energy passed through campus.”
Penn State professor, Tieyuan Zhu and a team of researchers turned miles of cables under campus into virtual sensors capable of detecting seismic events caused by thunder echoes. This research can provide information on the Earth’s interior and the impact of other natural hazards.
Read more at Penn State News.
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Underground fiber-optic cables don’t just connect us to one another by giving us access to telephones and the internet; they also can serve other purposes.
Through testing underneath the University Park Campus, a team of Penn State researchers discovered that by sending a laser sensor down the cable, they were able to detect the smallest changes in ground pressure.
“If there is any change in the external energy on the ground above, even walking steps, you will have a very small change that’s going to stretch or compress the fiber,” said Tieyuan Zhu, assistant professor of geophysics at Penn State.
This multi-functional technology can help detect changes in the ground during all kinds of natural disasters and help lead to better preparation to protect buildings and people.
Read more at IFLScience.
ALMA Shows Volcanic Impact on Io’s Atmosphere
Io is the most volcanically active moon in our solar system. It hosts more than 400 active volcanoes, spewing out sulfur gases that give Io its yellow-white-orange-red colors when they freeze out on its surface.
Credit: ALMA (ESO/NAOJ/NRAO), I. de Pater et al.; NRAO/AUI NSF, S. Dagnello; NASA/JPL/Space Science Institute
ViaThe National Radio Astronomy Observatory
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Beautiful day for some resistivity training!
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#universityofyork #University #York #UnitedKingdom #malton #roman #classicalhistory #geophysicalsurvey #geophysics #archaeologygrad #archaeologist #Archaeology #digitalarchaeology #england (at Malton, York, United Kingdom)
https://www.instagram.com/p/Bt3lfqqF9IY/?utm_source=ig_tumblr_share&igshid=h2c6x7tisoy1
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New type of magnetic wave discovered in Earth’s core | Live Science
Scientists have detected a completely new type of magnetic wave that surges through Earth’s outer core every seven years, warping the strength of our planet’s magnetic field in the process.
The waves — dubbed “Magneto-Coriolis” waves because they move along the Earth’s axis of rotation, per the Coriolis effect — creep from East to West in tall columns that can travel up to 930 miles (1,500 kilometers) per year, the researchers wrote in a March 21 paper in the journal Proceedings of the National Academy of Sciences. Using a fleet of European Space Agency (ESA) satellites, the team pinpointed the mysterious waves to the outermost layer of Earth’s liquid outer core, right where that layer meets the rocky mantle — roughly 1,800 miles (2,900 km) below the planet’s surface.
According to the researchers, the existence of these waves could help explain mysterious fluctuations in the planet’s magnetic field, which is generated by the movement of liquid iron in the planet’s outer core. Satellite measurements of the magnetic field taken over the last 20 years show that the field’s strength dips every seven years or so, coinciding with the oscillations of these newfound waves.
“Geophysicists have long theorized over the existence of such waves, but they were thought to take place over much longer time scales,” lead study author Nicolas Gillet, a researcher at the Grenoble Alpes University in France, said in a statement. “Our research suggests that other such waves are likely to exist, probably with longer periods — but their discovery relies on more research." …
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