26
votes
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If a very huge Earthquake occured anywhere on Earth could waves emerge to come together again on the opposite side?
It is called "antipodal focusing". See for example Antipodal focusing of seismic waves observed with the USArray.
We present an analysis of the M-w = 5.3 earthquake that occurred in the Southeast ...
- 2,359
23
votes
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Why are there waves in seas towards shore - even in night?
Ocean waves (and also in mediterranean type seas and larger lakes, but on a smaller scale) are generated by two processes:
locally generated waves ("wind waves"), which follow the direction of the ...
- 560
10
votes
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Are these clouds exhibiting gravity waves?
These are rotor clouds, and are manifestations of "Lee Waves", a particular kind of internal "gravity wave" (better defined as "buoyancy effect").
Forced convection helps form these clouds as warm, ...
- 2,813
6
votes
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What might cause these "wave clouds" near the horizon? Could it be gravity waves?
Identification of the phenomenon based solely on the photograph is unfortunately inconclusive, although several reasonable possibilities exist. While a wavelike structure is apparent, exact ...
- 1,144
6
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How can oceanic Rossby waves move from East to West?
Yes it is. In fact Rossby waves always move westward in the absence of a zonal mean flow. Before going into detail lets try to explain this qualitatively. In a barotropic fluid the absolute vorticity ...
- 1,165
6
votes
Wave height data for Indian east coast
The paper Assessing Coastal Vulnerability to Sea-Level Rise between Gopalpur and Puri, Odisha Coast of India, using Remote Sensing and GIS on page 849 states it used wave height data from the INCOIS ...
- 25.1k
5
votes
How will climate change affect planetary waves?
As a non-climate specialist, this topic is on the edge of my understanding of meteorology, but here are some papers that I found potentially relevant to your topic.
Here is a quote from the summary ...
- 3,376
5
votes
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Units of wave spectrum
I understand that the integral of the spectrum over all frequencies is the variance which means that the integral should have $m^2$ units? Please correct me if I am wrong.
You are correct. If ...
- 4,993
5
votes
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What's really happening with "stormquakes"?
The article can be found here in Geophysical Research Letters:
Fan, W., McGuire, J. J., Groot‐Hedlin, C. D., Hedlin, M. A. H., Coats, S., & Fiedler, J. W. ( 2019). Stormquakes Geophysical Research ...
- 216
5
votes
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SWAN wave model: HSIG is strangely low
You need to use the following line in your model setup:
COORDINATES SPHERICAL
Otherwise SWAN will try to calculate wave properties on a curvilinear grid with ...
- 560
5
votes
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Are ocean waves diminished, enhanced or unaffected by underwater obstacles
Waves travel over the ocean surface with columns of water molecules moving in a circular motion, as seen here.
As you can see, when the waves reach shallow ground, the friction of the molecules over ...
- 66
5
votes
Are there any types of winds or waves that are produced just by Earth's rotation?
Yes. Such a thing is called an inertial oscillation.
Kelvin waves are not examples of inertial oscillations. Kelvin waves balance the earth's rotation against the normal force of a topographic ...
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4
votes
How much water does a wave transport into a sea cave?
The time-averaged material transport by water waves is quantified by Stokes drift, which is the residual Lagrangian drift due to sub-surface orbits not being closed:
$$
u_{St} = \dfrac{\omega k^2 a \...
- 4,993
4
votes
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The mean direction of waves in a directional distribution
It is helpful to understand the meaning of Fourier coefficients in the directional wave spectrum analysis.
A pitch-and-roll buoy measures time series of water elevation $\eta$, and slopes in both ...
- 4,993
4
votes
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Depth of the wind-induced currents and the shoreline
First, a bit of background, following the Navier-Stokes equations and assuming steady state conditions, we can obtain a simplified balance known as Ekman balance for the boundary layer of the upper ...
- 15.5k
4
votes
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ERA Interim problem with Waves
I haven't looked into ERA-Interim wave data a huge amount but I know around 1991 it started to assimilate ocean wave data from satellite altimeters (ERS-1).
See the first figure here
https://...
- 201
4
votes
Why does wind blowing against a strong current create way bigger waves?
There are two physical processes at play here:
Wind speed relative to the ocean surface
Wave focusing and blocking in opposing current
Wind speed relative to the ocean surface
As you describe in ...
- 4,993
4
votes
Searching for common wave vocabulary
Here is what I found if useful for others -
Oceanic Wave Clarification
Wave position in space (x,y) and in time (t) are different concepts
Ocean waves in time are a vertical oscillation generated ...
- 151
4
votes
Do sound waves from volcanic eruptions travel around the world?
Yes, if you include low frequency pressure changes as would be recorded on a barometer as sound waves.
The 2022 Hunga Tonga eruption sent atmospheric pressure waves that were detected multiple times ...
4
votes
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How is wind made
Wind is produced by a pressure difference between two places. Air molecules move from higher pressure region to lower pressure region, this movement of air molecules is known as wind.
- 797
3
votes
How are chenier ridges and strand plains formed at wave dominated coastlines?
The following sources helped me understand these landforms - hopefully they can help you too :)
From the Miranda Shorebird Centre: The Miranda-Kaiaua cheniers are first formed as sand and cockle-...
3
votes
Travel Times for Seismic Wave Types - Why reflected t-x plot curves
This is conceptually relatively simple if you look at where the reflection (and refraction) happen, and in fact you have articulated the key concept in your question:
The reflected wave ...Over ...
- 278
3
votes
How does wind cause large waves?
This is going to be brief as on a phone : I welcome somebody posting a more complete answer. But the basic principle of large waves appearing from wind is:
from a smooth water surface, the wind can ...
- 5,810
3
votes
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Any site for monitoring equatorial oceanic waves?
There are a few sea surface height datasets available on PO.DAAC (the Physical Oceanography Distributed Active Archive Center), but this one seems to be (near-)real-time and global: the SARAL Near-...
- 5,348
3
votes
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?
tldr; Increased density corresponds with decreased P-wave velocity
The P-wave velocity for an isotropic medium is:
$$
V_p = \sqrt\frac{K+4/3\mu}{\rho}
$$
where $K$ is the Bulk Modulus, $\mu$ is the ...
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3
votes
Why are there waves in seas towards shore - even in night?
I'm making my comment an answer.
Waves are ubiquitous, except on land ;-). Waves in the open sea are a mix — a superposition — of waves in different directions.1 The dominating direction ...
3
votes
Why are there waves in seas towards shore - even in night?
Wind blows from sea to land in day and land to sea in night due to pressure and temperature difference.
Not so much. This is common in the Mediterranean in summer, for example, where the area sits ...
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3
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What are good oceanographic journals
When searching for a place to publish Earth Science stuff, have a look at the two big continental scientific societies: the American Geophysical Union (AGU) and the European Geosciences Union (EGU). ...
- 8,345
3
votes
Is there any information on the height of waves near New Zealand resulting from today's M 8.1 Kermadec Islands earthquake?
Norfolk Island experienced a tsunami wave 64 cm tall. In Australia the tsunami wave was 10 cm at Tweed Heads and 9 cm at Port Kembla. In Vanuatu the height was 32 cm and in Fiji 13 cm and 8 cm in ...
- 25.1k
3
votes
Wave height data for Indian east coast
Usually, the most reliable wave data for any of these areas come from the Wavewatch III solutions. Either the global solution or the one for specific regions (there is an Indian Ocean solution). The ...
- 15.5k
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