Questions tagged [waves]
The waves tag has no usage guidance.
68
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1answer
60 views
Why do P waves have a higher velocity in the lower mantle than in the core even though the core has a much higher density?
I've just started teaching 9th grade Earth science and my students and I have noticed something about P and S wave depth vs velocity graphs. In the typical graph,
eg: https://www.researchgate.net/...
2
votes
1answer
63 views
What's really happening with “stormquakes”?
The PBS Newshour article Scientists discover big storms can create ‘stormquakes’ says:
A stormquake is more an oddity than something that can hurt you, because no one is standing on the sea floor ...
1
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0answers
22 views
Complex Empirical Orthogonal Function analysis on Propagating wave
Since Complex EOF (CEOF) is doing hilbert transform before general EOF,
we can get four outputs in each mode.
Magnitude spatial pattern
Magnitude time series
Phase spatial pattern
Phase time series
...
1
vote
1answer
47 views
wave speed is smaller than both horizontal wave speed and vertical wave speed?
I am new to GIS and just get the idea of slowness. I can understand why people need the slowness in GIS rather than just the reciprocal of velocity. However, I feel the definition of slowness is weird ...
0
votes
2answers
185 views
Sea cave vs Sea arch
How do you distinguish sea cave from sea arch?
If I want to classify a crack of sea cliff as sea cave, has it to have a dead end? Would you call a geological formation as a sea cave even a kayak can ...
1
vote
1answer
47 views
reverse time migration for wave equation PDE using SBP-SAT
I'm stuck implementing a reverse time migration technique, the PDE(partial differential equation) being implemented is an acoustic wave equation, The numerical method being used is a FD(finite ...
4
votes
1answer
184 views
How does multiple layer seismic reflection work? How do we distinguish arrivals from different layers and their velocities?
Whenever we are investigating multiple layer interfaces in a seismic reflection survey the root-mean-squared velocity is often employed to deduce travel time to a certain n-th layer and also to deduce ...
2
votes
2answers
194 views
Travel Times for Seismic Wave Types - Why reflected t-x plot curves
I do not understand how the reflected wave in a seismic survey has a steepening slope (slows down) Please bear with me as I lay out my thoughts because I feel like I can grasp all of this except this ...
1
vote
1answer
48 views
Where can I find wave height/period, current velocity and wind speed/direction data at the Qiangzhou strait in China?
I'm looking for time series of wave height/ period, velocity currents and wind speed/direction specifically for the Qiangzhou strait in China.
Global data sets could also work.
3
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0answers
70 views
Do sound waves from volcanic eruptions travel around the world?
Do sound waves from volcanic eruptions travel around the world? I recently read about the Krakatoa eruption and how sound waves from that eruption traveled around the globe 4 times and were detected ...
1
vote
1answer
32 views
How the stepness can be computed at NDBC from site with only dominant wave data and windwave data
Hi guys I have an small question here. At the NDBC website they have at most of the buoys the steepness of the sea at that time and date: http://www.ndbc.noaa.gov/station_page.php?station=46012
...
2
votes
1answer
52 views
How is wind made [duplicate]
Everyone surely enjoys waves in the beach, but one question that has always been hovering around my head was about the wnd.
I have always been told that waves are formed by wind and all, but then ...
3
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0answers
114 views
Presence of cross stratified conglomerates in fan deltas
Why are cross stratified conglomerates found in deposits of fan deltas? I know that fan deltas are alluvial fans that deposit directly into the sea, hence they are poorly sorted.But could not ...
5
votes
0answers
291 views
How are chenier ridges and strand plains formed at wave dominated coastlines?
In the attached image, we can see chenier ridges and strand plains. How are they formed and what is the involvement of rip and longshore currents in their formation?
5
votes
1answer
203 views
Why does wind blowing against a strong current create way bigger waves?
It's a well known fact that wind will cause very big waves if blowing against a strong current, for example in the gulf stream off the US coast, or in the bay of San Francisco with a very strong (5 ...
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0answers
23 views
Looking at the brightest parts of the image how would one find the blackbody curve and wavelength maximum using a radiance calculator?
Look at the brightest parts of the photo and use a radiance calculator to find the blackbody radiation curve (show the plot of the curve) and the wavelength of maximum emission. How do ...
1
vote
1answer
171 views
Searching for common wave vocabulary
What do you call the leading waves and activity leading before a large wave?
3
votes
1answer
146 views
Wavewatch III data
I need to simulate some ocean data on the south coast of France, near to Marseilles. Ideally I am looking for parameters such as wind direction, wind speed, significant wave height, peak wave period ...
4
votes
1answer
68 views
How does wind cause large waves?
I was just wondering about the large waves associated with storms. It seems a little counter-intuitive that large masses of water can be put into motion by moving air (which is much lighter than water)...
5
votes
1answer
447 views
Depth of the wind-induced currents and the shoreline
In the open sea the speed of the current in the developed sea can be estimated as 3% the wind velocity at 10 meters.
Why is ocean surface velocity around 3% of wind velocity?
Is there a similar ...
6
votes
2answers
95 views
ERA Interim problem with Waves
Has anyone had a problem with significant wave height (swh) and mean wave period (mwp) from ERA-Interim not matching very well with either a time series of measurements or a different model? Or does ...
5
votes
1answer
203 views
What might cause these “wave clouds” near the horizon? Could it be gravity waves?
I found this image on a website - returned as a HTTP error 404 'not found'.
But the clouds look strangely repetitive. At first I thought the image had been "photoshopped", but as @gerrit pointed out ...
7
votes
1answer
128 views
How much water does a wave transport into a sea cave?
How much water is transported (volume) as a wave travels into a sea cave?
The wave has a height of 1 m and a period of 12 seconds. The average water depth at the cave mouth it 5 m and the width is 15 ...
5
votes
1answer
624 views
The mean direction of waves in a directional distribution
When modelling ocean waves, a directional distribution $D_f(\theta)$ is used together with a frequency spectrum $S(f)$ to describe the energy of waves at a particular frequency $f$ and angle $\theta$. ...
7
votes
2answers
266 views
Are these clouds exhibiting gravity waves?
This is a GOES visible channel image from 2017-01-27, about 9 a.m. local time. It's the Atlantic coast of the US. The coast is visible towards the bottom of the image. The scale is large.
This ...
7
votes
1answer
574 views
Units of wave spectrum
In ocean spectra such as the Pierson Moskowitz or the JONSWAP models, the units of $S(\omega)$ are $m^2/(rad/s)$ (or whatever unit of measurement you are working in). Where does the $m^2$ come from ...
7
votes
1answer
586 views
Analytical solution for seismic wavefield in MATLAB
I have been trying to evaluate the analytical solution for a wave travelling in a homogeneous, infinite media. For a given source $S(t)$, the wave-field can be calculated at a distance $r$, for a ...
2
votes
1answer
106 views
Any site for monitoring equatorial oceanic waves?
I use Carl Schreck's site Equatorial Wave Zoo for monitoring atmospheric waves such as Kelvin wave, Equatorial Rossby wave, filtered MJO OLR, Mixed Rossby Wave(MRG),etc.
Here is an example - Kelvin ...
7
votes
1answer
104 views
How will climate change affect planetary waves?
You can see planetary/rossby waves in the meanders of the jet stream. In short: If an air parcel moves from warm subtropics towards the pole, it will deviate toward the east due to conservation of ...
6
votes
0answers
126 views
Are extratropical cyclones the same as baroclinic waves?
Are extratropical cyclones the same as baroclinic waves?
I'm aware of the fact that extratropical cyclones form in 'baroclinic zones' and that they start of as waves. But are these what are referred ...
3
votes
1answer
986 views
Detecting seismic waves using Software Defined Radio
I understand about physic and waves, but I am a totally rookie in this topic. I was wondering which are the typical frequency ranges of the S-waves, P-waves and surface waves.
My idea would be to ...
2
votes
3answers
970 views
Why is a mild earthquake often mistaken as dizziness or vertigo?
Is it due to the longitudinal nature of the seismic waves?
When a heavy bus or truck goes by at high-speed, the shaking in nearby ground is not mistaken as dizziness, rather the feet and body feel a ...
3
votes
1answer
80 views
How would waves (in a fluid) behave without intermolecular attraction?
Water molecules, as many people know, are polarized, and so water molecules tend to have an attractive force between them. But how would the waves in water behave if this attraction no longer was ...
11
votes
2answers
194 views
Waves on sandy beach separating differently-sized rocks?
I recently went to a beach, and I noticed that the sand seemed to have a few distinct regions. I'm wondering what would cause this, and how it works.
One region is the part of the beach which is ...
6
votes
0answers
71 views
Effects of currents on peak wave frequency
I have been analyzing the surface wave measurements taken from the location where the waves interact with both opposing and following currents.
I don't understand why the peak frequency decreases ...
4
votes
1answer
566 views
What is the amplitude of the largest internal wave ever observed?
I have read from Vlasenko et al. (2014) that the largest amplitude of an internal wave recorded in the Celtic Sea is 105 m. Is this the largest ever or have any larger ones been recorded elsewhere (eg....
8
votes
1answer
600 views
What is a vertical wavenumber?
I can understand that the wavenumber is number of waves or cycles in a given distance. But what would a vertical wavenumber mean? Is it just another term for the wavenumber of a wave that is ...
2
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0answers
127 views
Where can I find wave scatter tables (joint probability Hs vs T) for certain coastal regions?
I am struggling to find a database or free source of joint probability of significant wave height and period, i.e. wave scatter tables. Data for buoys are useful, however not available for regions ...
8
votes
2answers
792 views
The significance of peak period in surface wave models
The peak period or peak frequency is considered to be an important quantity in characterizing ocean surface waves, including wave models [e.g., 1]. But practically, why are we interested in modelling ...
4
votes
1answer
324 views
Best book/s of oceanic data treatment and analysis?
I would like to purchase a/some books which are really good and practical references to get into the oceanic data (wave heights,currents and sea level) treatment and statistical analysis, coming from ...
9
votes
1answer
197 views
Why can't wave models model storm surge?
I found this nice module here on MetEd that gives an overview of the WAVEWATCH wave model. In it, in the Introduction section, it is mentioned that WAVEWATCH cannot model storm surge or tsunamis. Is ...
6
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0answers
107 views
What makes the SWAN wave model suitable for coastal regions?
It appears that the SWAN wave model is adept in shallow water and coastal regions. See for example here and here. What makes SWAN more suitable in these regions than other wave models like WAVEWATCH? ...
8
votes
2answers
838 views
What is the best way to accurately measure wavelength between crests on a pier?
What is the best way to accurately measure wavelength between crests from a pier?
9
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2answers
453 views
How does a tsunami affect biology and other matter in its path while in deep water
Is everything in the water column going to be affected?
7
votes
1answer
2k views
What is the meaning of seismic spectral blueing?
What is the meaning of seismic spectral blueing? Please cite any good introductory materials if possible.
15
votes
2answers
1k views
At the ocean surface, why do large amplitude waves travel faster than small amplitude waves?
I understand the mathematics behind it but I am looking for an intuitive description.
5
votes
1answer
3k views
Whitecapping in ocean surface waves
Even though the physics of wave breaking for ocean surface waves may not be well understood, what wave breaking is and what it looks like is no mystery to the average beach-goer. However, I am ...
10
votes
1answer
2k views
How does one determine the optimum offset in a seismic survey?
I was going through a report on MASW (Multi Station Analysis of Surface Wave) and found this
"To avoid the aliasing in the space domain, geophone spacing (Δx) needs to be less than half of the ...
8
votes
3answers
885 views
Why do deviated wells show poor correlation to seismic data?
Well correlation and calibration is an important step in any type of seismic inversion. In order to obtain a good broadband frequency model, the synthetics should be correlated with original seismic ...
7
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0answers
78 views
Availability of mean squared slope or wave spectra data for the sea surface
The mean squared slope is a property of the sea surface that is often sensed by microwave radars [1] [2].
While spatial data for sea surface salinity, sea surface height, and significant wave height ...
