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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.

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Estimating the Pressure of Earth's Center

The pressure of a medium of density $\rho$ and in a graviational field with strength $g$ at a depth of $z+dz$ is equal to the pressure at $z$ plus the pressure caused by the weight of a slab of volume ...
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How long for released dye to uniformly saturate the oceans?

Suppose a supertanker filled with purple dye breaks open at a particular point in the middle of the Pacific Ocean and spills an enormous volume of purple dye into the ocean all at once. Imagine that ...
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How can an electrically neutral planetary core be geodynamo? [duplicate]

The standard theory for the earth's magnetic field is that the planet's core is a geodynamo. I know moving electric charges can induce a magnetic field, but I also know that opposite charges produce ...
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4answers
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Do CFCs get emitted in air from appliances?

Do the refrigerators and air conditioners that use CFC or HCFC cause damage to the environment even when they are working normally. I mean, is there any gas emission under normal conditions when the ...
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1answer
476 views

How do we know the Earth's core is Molten with Seismology?

My current knowledge about how the core of the earth was discovered is the observation made from non returning/reflecting sonar signal when sent to deeper depths through the earth's crust/mantle. How ...
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59 views

How did Mars lose all its surface water?

A lot of geological evidence suggests that Mars once had quite a bit of surface water. I assume it wasn't whisked away into space, so where did it all go? What processes caused the water to go there? ...
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Do a floor tile or dry sand conduct electricity

If you touch an electric wire while standing on a ground made of soil or floor tile, you will get electrocuted. So, electricity passes through it. Right? Shall I conduct an experiment by passing ...
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45 views

Has there been a quantifed estimate of the thermal impact of human activity? Not to include “greenhouse gasses” [closed]

In 1984 I read a prediction by the biological scientist and Nobel Laureate Konrad Lorenz that heat produced by human activity would necessarily increase Earth's average atmospheric temperature. His ...
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High pressures under ocean surface

I read a book about deep water exploring in mariana's trench. They of course talked a lot about pressure, and so this question came to my mind: If you're, say, 2km down in the Mariana's Trench there ...
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How can I calculate the ratio of distance between 2 longitudes at different latitudes?

Suppose i have to calculate the ratio of lengths of AB and CD where A(0° N,0° E) and B(0°N,30° E), and C(30°N,0°E) and D(30°N,30° E) the values are just as an example.Is it possible to get the ratio ...
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young's modulus vs longitudal deformation modulus

Young's modulus is typiccaly denoted with E. I have come accross a similar quantity called longitudal deformation modulus (in Russian literature, they call it модуль продольных деформаций) and it is ...
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Max. air temperature on Earth [duplicate]

Is there any max. temperature that air on Earth could reach, assuming that solar radiation is standard and the average temperature on Earth is 14.6 like today? I mean, is there any chance that the ...
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1answer
63 views

A sound argument for existence of Americas, along al-Biruni's lines?

In 11-th century, Al-Biruni computed circumference of Earth with high accuracy, and mapped all then-known terrain. He then argued that the unknown part of the globe cannot be all ocean, predicting ...
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2answers
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Global warming and air temperature

The layman's question. Is there a maximum temperature that can be reached by air on Earth due to global warming? For example, one that would prevent living organisms from functioning? I read somewhere ...
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Seismology - PPV / VDV from geophone waveform data

I'm using an inexpensive seismometer to try and measure the effects of local HGV traffic on buildings. The device is connected to a Raspberry PI that has a Cirrus Logic Audio Card. The signal is fed ...
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123 views

Shape of Earth's magnetic field

Why earth's magnetic field is compressed on day side and extended like tail on night side, like this I know that it's due to solar wind but not how that compression and extension happens.
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4answers
84 views

Is effective gravity constant over the surface of the ocean?

According to Wikipedia: The Earth is not spherically symmetric, but is slightly flatter at the poles while bulging at the Equator: an oblate spheroid. There are consequently slight deviations in ...
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60 views

Black hole internal mathematics

I read the article about mathematicians-disprove-conjecture-made-to-save-black-holes and was wondering: could we compare the universe to Meteorology and geophysics on earth to answer some of questions ...
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1answer
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Are North aurora and South aurora produced by positive and negative particles respectively?

Are North aurora and South aurora produced by positive and negative particles respectively?
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What determines the shape of lightning? [duplicate]

Everyone's seen lightning streaks, either in real life or in pictures and videos. My question is, why does it look the way it does? Does lightning spread in a random manner, or is there physics ...
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1answer
207 views

What happens if Earth loses its magnetic field?

Earth's magnetic field is shifting at a high speed does this mean earth will lose its magnetic field and if it does are we in danger or if it doesn't what are consequences of the poles shifting
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Why does the Earth have six atmospheric bands?

This is a follow up to Why doesn't Earth's atmosphere form bands due to different rotational speeds? I know that the earth has atmospheric banding like the gas giants. What I want to know ...
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Computing the porosity of a core sample from a set of digital images

Are there any references of books and/or papers about methods to compute the porosity of a given core sample (from an oil and gas reservoir) if this core is given as a set of digital images (for ...
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2answers
117 views

Why Earth is like a magnetic dipole?

Earth’s magnetic field is mostly caused by electric currents in the liquid outer core, which is composed of conductive, molten iron. Loops of currents in the constantly moving, liquid iron create ...
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1answer
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What is below a tectonic plate?

I know that tectonic plates float on mantle but when two plates move away from each other, is the mantle below them exposed to the surface?
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103 views

Calculate Height of Ocean Tides if Earth Had a Larger/Smaller Radius

For context, I'm coming at this question from the Worldbuilding stackexchange, where I've posted a related question. I'm not a physicist or scientist by training, so if I make any glaring errors, ...
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248 views

Why Earth’s magnetic field is reversing its direction every few million years? [duplicate]

Just now I was studying the Magnetism and Earth's magnetic field source. when I read that the earth's magnetic poles are not fixed and keep changing ( the north becomes south and the inverse) every ...
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Calculating earthquake magnitude/intensity given the 3-axis acceleration $(x,y,z)$

I have a projects that detects an earthquake. I have an accelerometer to detect a vibration or motion but my problem is how to calculate a magnitude of an earthquake by the three axis $(x,y,z)$. Can I ...
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1answer
54 views

Is there a way to express stream power for an entire watershed?

Fluvial geomorphologists describe stream power, $\Omega$, as the 'rate of energy dissipation against the bed and banks of a river per unit downstream length'. It is expressed as a function of water ...
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Growth of iron crystals

What determines how large a crystal of iron will grow when heat and pressure are applied? I was thinking about the Earth's core. Some have postulated that a large iron crystal is at the center of the ...
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How long would rising hot air from a 15,000 meter (49,000 ft) hole in the earth's surface stay warm for?

The deepest hole drilled in the earth is the Kora Borehole. At 15,000 meters (49,000 ft), the temperature was projected to reach 570 degrees F (299°C), so drilling was abandoned. My question is, if ...
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2answers
117 views

What factors affects the cold temperatures in high altitudes?

Why it is that high altitude areas are colder than low altitude areas? Is it because the air pressure or any other? If we consider it with the sun rays, high altitudes receive sun rays earlier than ...
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783 views

Venus, Earth and Mars Magnetic fields

Why does Earth have a magnetic field, while it appears that Venus and Mars have none or very little?
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Earth's gravitational Field vs. Mars's and Venus [closed]

Why does Earth still have an active, Hot interior core, but Mars and Venus have none?
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147 views

How have “natural” permanent magnets been magnetised?

Is there a generally accepted theory about how permanent magnets on the earth have been magnetised by natural processes? We have earth's natural magnetic field that could be responsible but in order ...
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906 views

Why is there more land-mass in The Northern Hemisphere? [closed]

So, this has been bugging my since my youth. When looking at a map of The Earth. In the Southern Hemisphere, both Africa and South America are tall and slim, they get thinner towards the pole. Then ...
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1answer
75 views

Mountain Gravity

Because gravity weakens the farther you are from the mass. Would standing on the side of a mountain change the direction gravity pulls on you because you are closer to the mass of the mountain then ...
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336 views

Why is Earth's magnetic field so stable?

This answer explains why the Earth has a magnetic field, this answer explains why the Earth's magnetic field flips. However, neither seems to answer the question of why the Earth's magnetic field ...
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2answers
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Why does the Earth even have a magnetic field? [closed]

From my knowledge of magnetism, if a magnet is heated to a certain temperature, it loses its ability to generate a magnetic field. If this is indeed the case, then why does the Earth's core, which is ...
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42 views

Does mankind possess the technology to intentionally trigger a Yellowstone eruption? [closed]

The Yellowstone Caldera eruption will probably be an Extinction Level Event when it eventually happens. Suppose some lunatic wanted to set it off now, with drills, bombs, or whatnot. Say this lunatic ...
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Analyzing composition of a mineral using SEM

If I have a mineral in which I did a SEM analysis on and got the data (elements and their wt% with Std. Dev., MDL, atomic % oxide % and k ratio) how would I go about quantifying the sample's ...
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1answer
102 views

Is Earth gaining energy?

Since we can get energy from the Sun, either directly or indirectly through fossil fuels, and we can use this energy to drive our motors which release energy in the form of heat (back into the ...
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1answer
54 views

Laplace's tidal equations

Do you know where to find a clear, pedagogical derivation of Laplace's tidal equations for the tidal elevation $\zeta$ and the velocities $u$ and $v$ of a fluid sheet located on a rigid body?
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116 views

Why do conductors moving in Earth's magnetic field not create electricity? [duplicate]

if earth is a magnet and there are conductors moving in it why do we not get a current from them, seeing as it is a conductor moving in a magnetic field
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3answers
2k views

Why is it hot before raining?

What causes the temperature hike before a rain? I have heard explanations like one that says as the moisture rises, you sweat more. Can somebody provide a more scientific explanation for this.
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1answer
53 views

Why do the clouds near the horizon appear two dimensional?

Look at the photo. The clouds right above us seem real, but those near the horizon appear as if they are from a painting. They lack depth and are visually flat. Why is that?
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2answers
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How solidified lava helped find the history of Earth's magnetism?

I came to know that the earth's magnetic axis is shifting, and a proof to this involves analysing the solid lava found near volcanoes for centuries. How does lava analysis help in finding the shift ...
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1answer
42 views

Does Earth's precession rate change with the seasons?

As Earth's precession is caused by the differential solar, etc., attraction to its 'spare tire', then does the rate go to ~zero at the equinoxes and ~twice the average at the solstices? (preferred ...
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How can I calculate the sensitivity of a seismometer?

I would like to know how to find the minimum ground motion a seismometer can measure, specifically if a certain seismometer can measure 1 micron/sec velocity. I have a few specs from the datasheet but ...
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290 views

Volume of melted polar ice caps

If (or rather when) the polar ice caps melt, will they occupy more, the same or less volume? Somehow all options seem possible to me. I don't assume they are just big ice cubes floating on the poles....