Questions tagged [geophysics]
The study of the physical processes and properties of the planet Earth. Applicable to many subjects about Earth, such as its shape, its magnetic field, and ocean currents.
423 questions
-3 votes
1 answer
84 views
Has someone ever obtained a relative trajectory being exactly the Coriolis formula without a background centripetal force (as gravity)?
In geophysics and many other cases, the Coriolis formula is clearly linked to a background centripetal force. Read Anders Persson (UK MetOffice, EU ECMWF, Sweden SMHI, Uppsala) https://scholar.google....
12 votes
3 answers
3k views
If gravity bends spacetime, why don’t we detect time dilation gradients inside large objects like Earth?
General relativity says that mass curves spacetime, and that time passes slightly slower in stronger gravitational fields. But the gravitational field changes continuously inside Earth. Does that mean ...
- 899
0 votes
1 answer
97 views
A better way to model the age of an ice sample as a function of the depth? [closed]
I am currently working on the following problem: The thickness of the annually deposited ice layers in the ice core can be determined by examining chemical impurities and isotope ratios. Under ...
- 25
0 votes
0 answers
76 views
Electromagnetic repulsion against the Earth's field?
For starters, I already know from other answers here about magnetic repulsion against the Earth's field that it's not possible with a passive magnet (or even a superconductor), since the Earth's field/...
0 votes
1 answer
99 views
Oceans, rising sea levels, and earthquakes [closed]
Can someone explain why sea level would not continue to be the same even as the icecaps melt? I am asking because I don't understand why the oceans water would not end up penetrating deeper into the ...
0 votes
0 answers
43 views
Where can I find the data/values of core (inner core at least) temperature of planets in solar system or out of it?
I've searched it in NASA Factsheets, various sites, searched in some journals as well. Results are not satisfactory. Need research papers related to core temperature that can be cited which are from a ...
0 votes
0 answers
152 views
Is the greenhouse effect really the sole variable in surface temperature?
On this subject, almost all texts I've read have included the claim that GHGs heat the surface of the Earth by 33°C. The currently accepted value for the amount of solar radiation absorbed by Earth is ...
3 votes
1 answer
217 views
Derivation of the solar resource at Earth's surface
I am reading Jenny Nelson's The Physics of Solar Cells and am a bit confused with the derivation of the solar irradiance at the Earth's atmosphere she supplies. I'll outline it here, and I provide ...
- 1,391
1 vote
1 answer
133 views
Solve for the shape and curvature of Earth's magnetic field
How can I solve for the shape of Earth's magnetic field (neglecting the effects of the solar wind which distort it). It looks very similar to the field due to a solenoid, but I can only find solutions ...
1 vote
1 answer
131 views
Lamb wave derivation: Elastic wave propagation in a thin sheet
I am trying to follow the derivation for the phase velocity for elastic waves with large wavelengths compared to sheet thickness, propagating in a floating ice sheet, as described in Propagation of ...
-4 votes
2 answers
269 views
Surely $\rm CO_2$ reflects incoming solar infrared radiation?
Is the greenhouse effect not cancelled out by the $\rm CO_2$ in the atmosphere reflecting solar infrared radiation back into space? It seems logical to me that, if $\rm CO_2$ reflects infrared shifted ...
1 vote
1 answer
142 views
Why the density have anything to do with initiation of subduction?
No matter wherever I read the process of subduction, I always find this one sentence which says "when the two tectonic plates collide the denser plate gets subducted under the lighter plate ...
2 votes
0 answers
101 views
ELF Electromagnetic wave propagation in plasma (ionosphere) - how?
Can an extremely low-frequency electromagnetic wave (below 500 Hz for example) propagate through an ionosphere? The cutoff frequency of Earth-ionosphere waveguide is approximately 1.7 kHz so I ...
- 165
1 vote
0 answers
77 views
Trouble understanding the experssion of gravity on a cube shaped earth
I'm a high school student working on a maths/geophysics project of which my goal is to try to mathmatically expressthe forces that apply on fluids, and then put them together to express geostrophic, ...
- 11
0 votes
6 answers
262 views
Conservation of water?
I know that water can exist in various states (liquid, solid, ...) and can be in various places (clouds, oceans, ground, ...). What I want to know is whether or not the total number of water ...
