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Related Concept Videos

Shock Waves01:16

Shock Waves

2.0K
While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
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Wave Parameters01:10

Wave Parameters

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The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
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Sound Waves: Interference00:53

Sound Waves: Interference

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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Travelling Waves01:04

Travelling Waves

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A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is...
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Interference and Superposition of Waves01:07

Interference and Superposition of Waves

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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
5.1K
Sound as Pressure Waves01:17

Sound as Pressure Waves

2.4K
Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
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Updated: Jun 13, 2025

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing

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Forecasting ocean wave-induced seismic noise.

Andrea Bertoldi1, Stéphane Gaffet2, Marco Prevedelli3

  • 1LP2N, Laboratoire Photonique, Numérique et Nanosciences, Université de Bordeaux-IOGS-CNRS, Talence, France. andrea.bertoldi@institutoptique.fr.

Scientific Reports
|September 9, 2024
PubMed
Summary
This summary is machine-generated.

Scientists can now forecast seismic noise up to 16 days in advance. This prediction uses sea weather data to anticipate seismic noise levels, aiding research and industry planning.

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Related Experiment Videos

Last Updated: Jun 13, 2025

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Area of Science:

  • Geophysics
  • Oceanography

Background:

  • Ocean waves generate seismic noise within the 0.03 to 1 Hz frequency range, establishing the seismic noise baseline.
  • The relationship between seismic noise and sea weather is well-understood but has not been used for forecasting.

Purpose of the Study:

  • To predict the seismic noise spectrum around 1 Hz at the Low-Noise Underground Laboratory (LSBB).
  • To forecast seismic noise up to 16 days in advance using sea weather data.

Main Methods:

  • Characterized seismic noise at LSBB based on Mediterranean Sea and Atlantic Ocean weather using buoy data (2020-2021).
  • Exploited correlations in the microseismic frequency band to convert sea weather forecasts into seismic noise predictions.

Main Results:

  • Successfully predicted seismic noise spectrum around 1 Hz at LSBB up to 16 days in advance.
  • Demonstrated a quantifiable link between sea weather and seismic noise levels.

Conclusions:

  • Seismic noise forecasting is feasible by leveraging sea weather predictions.
  • Predicted seismic background noise can optimize scientific and industrial operations through scheduling and adaptive analysis.