Questions tagged [geophysics]

Geophysics is a subject of natural science concerned with the physical processes and physical properties of the Earth and its surrounding space environment.

Filter by
Sorted by
Tagged with
0 votes
0 answers
40 views

The problem of the dissimilarity in the range of data values ​between the gridded data and the channel database in geosoft

My question is about the problem when displaying the eU radiometric map of my study area, as the range of values ​​for the eU map is much larger than the actual range values ​​of the eU channel in the ...
user avatar
  • 1
3 votes
1 answer
40 views

Is there a way to calculate crater depth?

For the sake of the example, let's assume a crater on Earth roughly twelve miles in diameter. Is there a way to calculate a range between how deep or shallow this crater would be?
user avatar
  • 161
3 votes
1 answer
72 views

Predicting rock type from seismic processing

In reflection seismology, we create a source with an airgun and then use receivers to register acoustic waves (an approximation) at the surface. From these measurements, we can predict a velocity ...
user avatar
6 votes
2 answers
107 views

Can "meanders in meanders" form naturally?

I recently rafted the San Juan river in Southern Utah, which flows into the Lake Powell reservoir. When the water levels in Lake Powell were very high, it extended far upstream into the San Juan ...
user avatar
1 vote
0 answers
56 views

Specific cases of 528 Hz harmonics that appear in nature that are not wideband radiation or noise? [closed]

I was looking up something about the 528 Hz frequency that people like to talk about, and some of the evidence used to support the idea seemed a little irrelevant. Like, of course the sun emits 528 Hz ...
user avatar
10 votes
3 answers
2k views

Taking into account the decay products of transuranic elements, are the world's uranium reserves growing or shrinking?

I was talking to a friend of mine who is an environmentalist like me but not a big fan of nuclear power and she told me it was not a good option in the long run because of the decay of uranium. Of ...
user avatar
  • 111
4 votes
0 answers
53 views

Coriolis parameter approximations

When solving equations involving the Coriolis parameter $f = 2\Omega\sin{\varphi}$, I often see the $f$-plane (constant) or the $\beta$-plane (Taylor expansion) approximations. If I'm solving ...
user avatar
  • 41
3 votes
1 answer
60 views

Elevation accuracy to distinguish maximal gravity anomaly of a sphere with 50% hematite

Question: What is the accuracy required in elevation to distinguish the maximal gravity anomaly of a spherical 50% Haematite (Iron mineral) ore with a radius of <...
user avatar
3 votes
0 answers
38 views

Do greenhouse gases absorb and re-emit photons or reflect them diffusely? Or both? (CO2, CH4, H2O, N20, HFC-134a, etc.)

Also, would it matter if a particular type of greenhouse gas molecule reflected rather than absorbed and then re-emitted light? Would its GWP be higher or lower? Perhaps this is more of a pure ...
user avatar
1 vote
0 answers
42 views

What are the boundary conditions for Navier's Equations of motion in seismic?

Navier's equations of motion in seismic have 3 solutions, according to how it is resolved (boundary conditions): for Vp (compression waves) for Vs (shear waves) for Vr (Rayleigh waves) I know the ...
user avatar
1 vote
1 answer
50 views

Can Hydrocarbons be beneficial? [duplicate]

Do these “fossil fuels” underground help maintain homeostasis in microbial ecosystem or aid in the growth of flora etc? Or are these substances: coal, animal remains and natural gas detrimental even ...
user avatar
5 votes
0 answers
48 views

Range of frequencies of the Schumann resonance?

Crossposted at Physics SE As the surface-ionospheric gap acts as a resonator for electromagnetic waves, it should have several harmonic values from the base, fundamental frequency of 7.83 Hz. These ...
user avatar
0 votes
1 answer
37 views

How to interperet audio magnetotelluric results?

I'm newbie in filed of Geophysics science. I will be grateful if you could help me to understand this chart what does line 12 or Line 11 mean? what about line15-14? How to identify the depths? what ...
user avatar
  • 103
4 votes
1 answer
64 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 ...
user avatar
1 vote
0 answers
51 views

Understanding the EM survey results

I have contour maps showing conductivity and in-phase data from an electromagnetic survey done on a ground, where, supposedly, an underground sewer system is running horizontally across the survey ...
user avatar
  • 11
4 votes
1 answer
576 views

What affects where a terrain will be rocky or grassy?

I’m working on a terrain generator and I now need to color the terrain to be rock, grass, or snow. Ignoring snow for now, at first I thought I’d make flatter areas grass and make steeper areas rock. ...
user avatar
  • 143
4 votes
0 answers
39 views

What is the electrical conductivity of a liquid Komatiite?

I am searching for previous work that has determined the electrical conductivity range for komatiites at the surface. Does anyone have some values or references?
user avatar
4 votes
0 answers
46 views

How hot would days get if it were always the solstice in the northern hemisphere?

Imagine the Earth's axis of rotation were to precess in synch with the orbit of earth around the sun so the north pole always pointed towards the sun (same current axial tilt of about 23 degrees). ...
user avatar
1 vote
1 answer
63 views

Why should wellbores be supported by pressure, but not mine tunnels?

I recently read about safe mud window - it states that the mud pressure in a wellbore should be high enough to prevent well collapse, and should not exceed the formation's fracture pressure. But ...
user avatar
  • 13
4 votes
0 answers
70 views

How much would the ground be displaced in a magnitude 11 earthquake?

In a magnitude 5 earthquake, the ground shakes violently and it's often impossible to stay upright. This is caused by about 50-120 cm of displacement of the ground. But how much would the ground move ...
user avatar
3 votes
1 answer
159 views

When will the Earth lose its magnetic field?

Mars lost its magnetic field 4.5 billion years ago according to this article: Mars lost its global magnetic field during the time of this heightened activity. After 500 million years, the Martian ...
user avatar
1 vote
0 answers
29 views

Quality control in Seismic Acquisition - shot offset shift

I have a problem with seismic data where the minimum offset of the shot is not centered at the nearest receiver, this shift can be for 3 traces 2 or one and maybe more in the two sides !! So is there ...
user avatar
3 votes
1 answer
133 views

IGRF -13 Geomagnetic field, Calculating Partial Derivatives of Legendre Polynomials

I have been trying to implement the IGRF-13 geomagnetic model on my own in C code. I have followed the equations from the website below and I am getting correct results for the B$_{\phi}$ and Br ...
user avatar
  • 31
2 votes
1 answer
148 views

Can a planet be heated by the green house effect to a temperature higher than that created by its incident and net absorbed, peak external radiation?

In that the green house effect, as caused by various atmospheric gases (e.g., H2O, CO2, CH4, etc), acts as an insulating layer which only retards the escape of heat from the planet, it would seem that ...
user avatar
2 votes
2 answers
51 views

How much of all current energy on earth arrived as sunlight vs. as kinetic energy during formation?

For example, sunlight captured by plants would count in the "arrived as sunlight" category, whilst heat energy in the core of the earth would count in the "kinetic energy during ...
user avatar
5 votes
0 answers
125 views

How do the Andes get so high?

I'm interested in the limiting factors on the height of mountains. There is a very good explanation at https://www.quora.com/How-tall-can-a-mountain-become-on-Earth-Neil-deGrasse-Tyson-says-Mount-...
user avatar
  • 549
1 vote
0 answers
19 views

Conversion of SEG-Y relative to MSL

I am working on the conversion of CSF file from SonarWiz into SEG-Y data. However, it comes back always related to the Sensor depth/altitude and never to the MSL. I have tried changing the bytes from ...
user avatar
1 vote
1 answer
93 views

What would happen if the inner core bulged and moved a tiny bit?

The inner core is solid only because of the very high pressure of the outer core and mantle . Say, if the inner core moved a teeny tiny bit would some of it liquify and melt? Or does it stay solid? ...
user avatar
  • 328
7 votes
1 answer
128 views

Where can I find an anisotropic PREM-like model for Earth's interior?

So, I just discovered PREM (the Preliminary reference Earth model) which models the density distribution of matter inside the Earth to any depth. The PREM is very convenient but since it only depends ...
user avatar
  • 324
4 votes
0 answers
56 views

Hypothetically, in the near future, could gas hydrate pingos erupt?

Could gas hydrate pingos erupt? If so, how quickly? And how much CH4 could they release? I'm sorry if the questions sounds silly. I'm new here and I don't know much about gas hydrates and oceanography....
user avatar
1 vote
1 answer
107 views

Is it possible to kickstart an hypothetical frozen earth with 0.6 ice albedo to an earth with an atmosphere, with just the sun at current distance?

Phase change of water at different pressures and temperatures tell us that with no atmospheric pressure 200 Kelvin (minus 73 Celcius) is enough to turn ice into vapor directly Wouldn't that suggest ...
user avatar
  • 71
0 votes
1 answer
50 views

Would it be possible, from the earth’s creation or during its various geomorphological changes, for all the following hypotheses to be probable?

I’m designing a fictional world setting for a game, and I would like to know whether it has a relative coherence based on science. (Don’t mind if it is an almost improbable scenario). Would it be ...
user avatar
  • 101
1 vote
1 answer
168 views

Why is the average 1 Bar temperature on planets with a thick atmosphere proportional to the distance of the sun?

The temperature of a planetary body in space varies with the fourth-root of the power incident upon it, this is derived from the Stefan-Boltzmann Law. This is understandable when applied to a black ...
user avatar
  • 71
4 votes
1 answer
115 views

Factor 1000 in mixing ratio formula

I am seeing two different formulas for the mixing ratio, which differ by a factor 1000. To be more specific: $w = 0.622 \cdot (e/p)$ and $w = 1000 \cdot 0.622 \cdot (e/p)$ where $e$ and $p$ are the ...
user avatar
  • 221
5 votes
0 answers
104 views

Did the Three Gorges Dam shift the North Pole by 2 cm?

Numerous sources repeat that, apart from slowing down the rotation of the globe, the Three Gorges Dam caused the geographic pole to shift by 2 cm. For example: https://blog.prv-engineering.co.uk/...
user avatar
3 votes
1 answer
91 views

How to measure global temperature?

people always talk about global temperature (such as the global temperature goal of 1,5 K) - but how is this value achieved? It seems to me that it clearly depends on where the measuring stations are, ...
user avatar
  • 133
0 votes
1 answer
56 views

Is COMSOL Multiphysics good for subduction CFD modelling? Are there alternatives?

As a beginner for CFD modelling of plate subduction, I heard comsol to be a good software. Can anybody suggests alternatives and the demerits of using COMSOL Multiphysics? Thank you.
user avatar
  • 15
0 votes
0 answers
61 views

Problem in downloading ERA5 data

it's my first time to ask question here, thank you for your answer(if any:) So I need to download the ERA5 land daily data, and as I try to download it from the website, the progress bar always shows ...
user avatar
2 votes
1 answer
190 views

Variation of the atmospheric pressure

By Hydrostatical Law, $p_a = \rho gh$, at a given $h$. However density varies with altitude and with temperature. Temperature varies by altitude. $g$ constant varies with altitude. How to express the ...
user avatar
2 votes
1 answer
96 views

Will California become a subduction zone in the distant future

California is one of the few places in the world that lie on a transform fault. My question is why considering the fact that North American Plate is moving westward shouldn't California be a ...
user avatar
3 votes
0 answers
53 views

Is it possible for Mexico to have a magnitude 9 earthquake?

Everyone has heard of the Cascadia Subduction Zone and the potential threat it poses. However, I have heard nothing about The Cocos Subduction Zone, even though it caused a devastating earthquake over ...
user avatar
0 votes
0 answers
44 views

How do I find the temperature measured at 350 hPa?

You are flying 2.5 km over the ground while your mates are flying up at 350 hPa. All the way between you there are clouds. If you measure that the temperature outside is 4 celsius, what temperature do ...
user avatar
2 votes
1 answer
57 views

How does rotating water affect turbulence?

I have been doing some DIYnamics with rotating water and non-rotating water. So I had a bucket filled with water on a rotating table, and waited for it to be in solid body rotation. I then dropped ...
user avatar
1 vote
0 answers
1k views

Is there a way to convert from Dip direction to Strike direction?

I have some set of recorded data in dip direction/dip format. I wish to transform then to strike/dip. I am currently having a hard time imagining how to convert from dip direction to strike direction. ...
user avatar
  • 11
1 vote
2 answers
70 views

How do scientists know the precise location, etc. of the earliest supercontinents? Or their configurations far, far into the future?

Obviously, we can look at where continental plates are currently moving, and extrapolate both forwards and backwards in time... But there have (allegedly) been more than supercontinent in the past... ...
user avatar
-1 votes
1 answer
145 views

Why does Meteorology rely on a spherical model of the earth, rather than a flat earth, to function? [closed]

I hear all the arguments one explains to a flat earther as to why the earth is Spherical and not flat. I am not a meteorologist, but I know enough Meteorology for me to fly safely as a pilot. Getting ...
user avatar
1 vote
1 answer
62 views

What would be the phase shift and polarity of a seismic wave upon reflection

What would be the phase shift and polarity of a seismic wave a) when it hit the free surface b)when the free surface reflection goes down and hit a reflector and returned to the receiver placed on the ...
user avatar
  • 11
1 vote
0 answers
36 views

Broadband Albedo Conversion Scheme

I had this albedo conversion written down: $$\alpha = 0.53\alpha_{VIS}+0.47\alpha_{NIR}$$ I had on my notes that this equation was form Collins et al (2002). However, I cannot find where this came ...
user avatar
  • 111
1 vote
1 answer
45 views

Rainbowish phenomenon outside my home

I took a photo of an amazing sight I had never seen outside my home ( southern india ) but I could not tell if it was a rainbow type thing or an aurora borealis. Also if it was to be a sun dog , ...
user avatar
3 votes
0 answers
138 views

Construction of a drift curve in the well tie calibration and how to interpret it?. Sonic calibration vs checkshot calibration

Good afternoon. Inside the creation of the synthetic seismogram some softwares have the option to run what is called "sonic calibration" or "checkshot calibration". I have some questions: 1)why some ...
user avatar

1
2 3 4 5
10