Earth moves far under our feet: Study shows Earth’s inner core oscillates
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Re: Earth moves far under our feet: Study shows Earth’s inner core oscillates
#2Since the change in length-of-day is mentioned, is seems more accurate to say that both the inner core and the crust oscillate with respect to each other.
Re: Earth moves far under our feet: Study shows Earth’s inner core oscillates
#3OT - but the insistence on italicized type for this article is rather bizarre. No other USC article I've ever seen follows this formatting.
Re: Earth moves far under our feet: Study shows Earth’s inner core oscillates
#4OT - but the insistence on italicized type for this article is rather bizarre. No other USC article I've ever seen follows this formatting.
Safari here, don't see that?
Re: Earth moves far under our feet: Study shows Earth’s inner core oscillates
#5Nikola Tesla is not surprised.
Re: Earth moves far under our feet: Study shows Earth’s inner core oscillates
#6I knew I felt something.
Re: Earth moves far under our feet: Study shows Earth’s inner core oscillates
#7This article seems like it's trying to imply that the core changes position relative to the earth, when all the actual details, and the linked journal article [0] only talk about changes in rotation speed relative to the surface. This appears to be a uniquely and bafflingly bad case of science journalism.
Anyway, it would be cool if this led us to understand where mantle plumes come from. I don't know how likey that is, but it seems that the dynamics between the core and mantle is the right place to look.
[0] https://www.science.org/doi/10.1126/sciadv.abm9916 <-- Just read the abstract of this instead
Re: Earth moves far under our feet: Study shows Earth’s inner core oscillates
#8> The scientists say their model of inner core movement also explains the variation in the length of day, which has been shown to oscillate persistently for the past several decades.
How do we measure persistent changes to the length of a day on Earth? This seems like a maddeningly slippery problem.
- Geosynchronous sattelites? What if they're slightly off?
- Star readings? Can we measure that precisely enough from the surface to find tiny fractions of change?
- Any surface-based reading also has to deal with the non-spherical nahure of Earth, and its wobble (the motion that gives us seasons)
How do they do it?
Re: Earth moves far under our feet: Study shows Earth’s inner core oscillates
#9> The scientists say their model of inner core movement also explains the variation in the length of day, which has been shown to oscillate persistently for the past several decades. How do we measure persistent changes to the length of a day on Earth? This seems like a maddeningly slippery problem. - Geosynchronous sattelites? What if they're slightly off? - Star readings? Can we measure that precisely enough from t…
Star readings. We can measure that accurately... In fact, a difference of 0.2 seconds is hugely significant with modern telescopes.
Re: Earth moves far under our feet: Study shows Earth’s inner core oscillates
#10> The scientists say their model of inner core movement also explains the variation in the length of day, which has been shown to oscillate persistently for the past several decades. How do we measure persistent changes to the length of a day on Earth? This seems like a maddeningly slippery problem. - Geosynchronous sattelites? What if they're slightly off? - Star readings? Can we measure that precisely enough from t…
> wobble (the motion that gives us seasons)
Axial inclination plus revolving around the sun gives seasons, wobble is a separate effect (and internal forces—mantle convection is the one I’ve mostly seen cited but core movement would also be in this category—are a source of wobble.)