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.

Filter by
Sorted by
Tagged with
1 vote
1 answer
46 views

Potential at a point on Earth due to orbital motion and the Moon

In "Physics of the Earth" by Frank Stacey and Paul Davis, they approximate the height of the tides on page 103. They assume the Earth is perfectly spherical, covered in a uniform layer of ...
13 votes
4 answers
3k views

Why is the ground warm during winter and vice-versa?

I was just looking at the geothermal house heating in Iceland, and came to know that in the winter the water is warm, hence cools the house, but how is it hot, not about us feeling it.. My question is ...
  • 139
3 votes
5 answers
129 views

Why is Earth's magnetic field not strong?

Why is Earth's magnetic field not as strong as the magnetic field that is artificially produced even though Earth's magnetic field is produced from an iron core that is very large? Wouldn't more iron ...
1 vote
1 answer
24 views

What is the Curie temperature of iron within the Earth's outer core?

According to Wikipedia, Curie temperature is affected by pressure: https://en.wikipedia.org/wiki/Curie_temperature#Pressure If my understanding is correct, since the liquid iron in the outer core is ...
  • 438
1 vote
2 answers
48 views

Can different radioactive dating method produce vastly differing results on the same item? [closed]

After being questioned by a creationist, some of their given evidence seemed to be more poignant to me than it had previously done. notwithstanding carbon dating methods which are highly prone to ...
  • 11
2 votes
2 answers
61 views

Why is modelling the Earth as having geomagnetic poles useful?

I'm reading about geomagnetic poles and wondering what their signifcance is. It seems one (and perhaps the main) purpose of using this type of model is for understanding the aggregation of magnetic ...
0 votes
1 answer
42 views

Application Of Kirchoff's Law In A Desert

Homework Statement:: Sand is rough and black so it is a good absorber and radiator of heat depending on temperature. During the day, sand's radiation of the sun's energy superheats the air and causes ...
2 votes
0 answers
40 views

Question about the MATLAB gravity models

There is a graph showing the gravity values as a function of latitudes for point mass, zonal harmonic, and wgs84 gravity models at Comparing Zonal Harmonic Gravity Model to Other Gravity Models. The ...
  • 107
0 votes
2 answers
38 views

Lopsided planet

Something that has always puzzled me about Pangaea. If we have a "roughly" spherical mass of solids, aren't two points on opposite sides approximately the same distance from the center of ...
  • 327
1 vote
0 answers
31 views

Would a gyroscope have solved the longitude problem?

So I was thinking about the longitude problem, which was the problem of determining the longitude at sea. It caused great problems in sea navigation. See: https://en.wikipedia.org/wiki/Longitude#...
  • 1,126
0 votes
0 answers
27 views

Would a 100-m tall wave really get reduced to near-zero height by hitting a West Cost style continental shelf, before reaching the actual shore?

This seems to be the conclusion of a 1996 study but the US Defense Nuclear Agency (which was renamed since then). Short shelf there refers to a West Coast style situation, known to allow for higher ...
  • 306
0 votes
1 answer
34 views

Do we have a "good" model for the temperature of the Earth's crust/mantle/core measured from the center of the earth?

Is there a "good" function $f$ that models the temperature of the Earth's crust/mantle/core measured $r$ miles from the center of the earth? By good, I mean a function that strikes a nice ...
7 votes
2 answers
309 views

Do neutrons fall to the center of the earth?

Neutrons have no electric charge so they don't interact with the electric and magnetic fields, have mass so they do interact with gravity and are smaller than nuclei so they pass through most atoms, ...
4 votes
1 answer
98 views

Why is ozone $\rm O_3$ in the Earth's upper atmosphere?

If you look at the density table, you will see that ozone has the highest density among other gases, so why is it in the upper layer of the atmosphere, in the picture I schematically drew how the ...
  • 181
0 votes
0 answers
26 views

What is the physical meaning of self-attraction and loading (SAL) in tides?

I came across the term self-attraction and loading (SAL) in many papers about tides. However, I don't understand the physical aspect of it. According to what I understand, self-attraction refers to ...
1 vote
0 answers
35 views

Approximating the warmest time of day

I'm trying to find a very simple approximation of when the maximum air temperature will occur on a given day at a given location. By "air temperature," I just mean the air temperature at ...
  • 300
1 vote
1 answer
39 views

Taking the mystery out of geopotential coefficients

Geopotential coefficients are usually notated Cnm and Snm (for example, see this IERS Tech Note). My questions (in the order I care about them) are, What are the constraints on n and m? Is n always ...
0 votes
1 answer
40 views

What direction is the wave traveling in? [closed]

I don't understand how one can derive the direction of travel of the wave just using equations for displacement. I believe it might be related to the wave equation which helps with other parameters ...
1 vote
0 answers
39 views

Upper limit of Schumann resonance harmonics?

This is a re-post from the Earth Science Stack Exchange which was posted two month ago. Due to the nature of the question and the SE site, it might be better to post this question here. As the Earth'...
0 votes
0 answers
21 views

How to compute the Ocean tidal effect by giving the lat+long for specific location on a website?

I am quite new in this and interested in computation of contribution of the Ocean tidal gravity. I am following the website (http://massloading.net/ondemand_form.html) to get the data but I want to ...
  • 1
1 vote
1 answer
106 views

Solar constant and Energy received by the Earth

I've been reading about black body radiation and I came across the topic of solar irradiance. If we consider the sun to be a perfect blackbody, then the intensity of the solar radiation at a distance ...
1 vote
1 answer
337 views

Energy required for a large tsunami

There has been a recent panic regarding the volcano eruption on La Palma in the Canary Islands. That this volcano might cause a massive tsunami that would kill millions. Wouldn't a 50 meter tsunami ...
  • 113
0 votes
0 answers
20 views

How long do geostrophic currents last?

My professor posed this question, without any relevant material. I suppose the currents last until the density gradient is neutralized, but I can't find any literature nor articles on this, regarding ...
2 votes
2 answers
48 views

Best latitude to harness solar power during June?

What is the best latitude at which to place a solar panel during the month of June? Assume for simplicity that any any given latitude there is a place without clouds or large mountains to obstruct the ...
  • 1,083
6 votes
7 answers
786 views

Actual astronomic latitude (direction of gravity) does not match calculations taking into account centrifugal force of earth

ABBREVIATED QUESTION/PROBLEM: The direction of earth's gravity vector does not point towards the center of the earth due to centrifugal force. Theoretically, it should point away by .1 degree. But it ...
  • 69
2 votes
2 answers
48 views

How can the change of the Earth's temperature be determined with more than 1/10 K accuracy as IPCC suggests?

How can one determine the extent of global warming (expressed as a temperature difference) with such precision? The latest IPCC report states temperature changes to fractions of one degree - without ...
  • 23
1 vote
1 answer
90 views

Earth's core must be producing light, where is that light energy going?

Earth core is about 5000°C hot. It must be producing light but no one can see it. So where is that light energy going? It isn't escaping to space for sure.
1 vote
1 answer
25 views

How would I determine the charge density of an active lava flow?

It is my understanding that in molten silicates, such as a basaltic lava flow, electrons are decoupled from solid state structures. If this is the case, as lava is flowing through a tube, how would I ...
27 votes
6 answers
10k views

Does gravity get stronger the higher up you are on a mountain?

So I saw this article stating that gravity is stronger on the top on the mountain due to there being more mass under you however I have read some questions other people have asked and most of the ...
19 votes
1 answer
3k views

How much of Earth's mass is created by the energy of the core?

I've read that higher energy means higher mass, and in atomic systems, the kinetic energy and potential energy actually contributes more mass than the actual particles themselves (or so I've read). So,...
  • 335
73 votes
3 answers
7k views

Why don't the Earth's oceans generate a magnetic field?

Many questions have been asked here about why the Earth has a magnetic field, e.g., What is the source of Earth's magnetic field? How does Earth's interior dynamo work? How can an ...
  • 3,898
2 votes
2 answers
101 views

What's the minimum possible size of a round astronomical body?

What's the minimum possible size of a spherical shaped rocky planet or satellite? Is it possible to occur a spherical shaped planet without having a molten core?
1 vote
0 answers
504 views

How many waves are in the ocean? [closed]

XKCD #2741 mentions in the title text It's cool how, when there's a number lots of people are curious about, but which isn't easy to measure, some random guess will get cited everywhere and become ...
3 votes
2 answers
323 views

What is the pressure at the centre of the Earth? [duplicate]

If the (net) gravity (at the centre of the Earth) is $0$, then what is the pressure? Some say it's astronomically big, but how can that be? Is it because of the (high) temperature? I can't think of ...
1 vote
0 answers
36 views

Atmospheres and oceans on lower gravity planets

Using Earth as an example, how much less gravity could the planet exert and still retain its atmosphere and oceans? Or is it a matter of size, mass, magnetosphere, place in the solar system, all of ...
  • 111
0 votes
1 answer
61 views

How much does wind speed change in an area/over time?

I am currently planning to implement wind force into a physics simulation and have a hard time figuring out how to best approach the problem. My main concern here is how consistent wind speed is. How ...
2 votes
3 answers
66 views

Had the centrifugal force of the rotation of Earth in the past forced liquid, hot Pangea to be positioned near the Equator?

Had the centrifugal force of the rotation of Earth in the past forced liquid, hot Pangea to be positioned near the Equator? Maybe also a question for 'GSE' but if we deal with centrifugal forces and ...
1 vote
4 answers
101 views

Paradox about greenhouse effect?

I know about the greenhouse effect, but isn't earth receiving the same amount of energy but getting hotter than with that same amount of energy? My guess is that earth reflects less light, but then ...
  • 13
45 votes
10 answers
11k views

Why can't the Earth's core melt the whole planet?

Earth core temperature is range between 4,400° Celsius (7,952° Fahrenheit) to about 6,000° Celsius (10,800° Fahrenheit). Source Why can't the Earth's core melt the whole planet? In other words, what ...
-2 votes
1 answer
98 views

Is General Relativity (GR) compatible with the expanding Earth hypothesis? [closed]

There is a lot of convincing evidence that the Earth and all the other planets and their moons are expanding with time. Prof. Samuel Warren Carey's summary of the evidence: https://www.youtube.com/...
2 votes
2 answers
154 views

Is there a modern accurate formula for the length of the sidereal year?

Newcomb (1898) gives the following formula for calculating the tropical year: $$365.24219879 - 0.00000614T$$ And the following for calculating the sidereal year: $$365.25636042 + 0.00000011T$$ Where T ...
0 votes
1 answer
120 views

Calculate the radius of Mercury's core with density, equatorial radius [closed]

I have a task where I don't know how to solve the second part. Some data on the planet Mercury: mean density $5400$ $kg/m^3$, equatorial radius $2440$ $km$, oblateness $0.0$, period of rotation $58....
  • 1
1 vote
2 answers
90 views

Is there a correlation between the Earth's spin, the moon, and temperature?

Based on NASA's arcticle, changes to land, ice sheet, ocean, and mantle flow affect Earth's spin. Does the moon's elliptical orbit around Earth also affect Earth's spin? What effect does distance play?...
  • 113
1 vote
1 answer
62 views

Why are the Earth and Moon so different?

The suggestion was made that the Earth and the Moon are two parts of a once whole object. If that is true then they must share the same basic composition. They also receive fairly similar amounts of ...
  • 568
0 votes
1 answer
139 views

What exactly are the 2 points where a magnetic needle becomes horizontal?

Textbooks and websites say: A magnetic needle rests making different angles with horizontal when suspended at different places of the earth In the explanation, they say that the magnetic needle ...
2 votes
2 answers
275 views

How to explain the Earth's Equatorial bulge without centrifugal force?

There are many answers to the question why is the Earth bulged at the equator, see e.g. here, but almost all of them involve centrifugal force. Since it's a fictitious force, how to we explain this ...
1 vote
1 answer
40 views

Does the Earth's magnetic field reversal and the corresponding magnetostrictive stress and strain make any contribution to the Earth's oblateness?

If the changing magnetic field in a power grid's transformer can induce stress and strain on the transformer core, then can the changing magnetic field of the Earth, similarly, place stresses and ...
  • 111
0 votes
1 answer
70 views

If the moon became a black hole, how much lower would the temperature be on Earth's surface?

I read that if the Sun became a black hole the Earth would become colder, but the effect would be negligible because the mass of the hole is still there so there would still be tides. But, how much ...
1 vote
3 answers
149 views

Does the inner core of the Earth drop?

If standing on earth, I experience the planet's gravity. Rain drops are accelerated to move toward its centre and reach the crust. These attractions are mutual. This contrasts to e.g., the ISS with ...
0 votes
1 answer
55 views

What will pole reversal cause to modern world and civilization?

I don't think it's just a matter of reorienting maps and recalibrating compasses. In any case, how long does a inversion last? hours, days, weeks, years? If it lasts days or more.... would Sun fry ...
  • 168

1
2 3 4 5
8