Investigation of the sources of microseism noise in the Indian Ocean caused by movements between the ocean and the atmosphere.
Authors/Creators
- 1. VASAVI COLLEGE OF ENGINEERING (VCE)
- 2. XPEDITION R (Research Group)
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3.
Vardhaman College of Engineering
- 4. VARDHAMAN COLLEGE OF ENGINEERING (VCE)
Contributors
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Data manager:
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Researcher:
- 1. VASAVI COLLEGE OF ENGINEERING (VCE)
- 2. XPEDITIONR (RESEARCH GROUP)
- 3. VARDHAMAN COLLEGE OF ENGINEERING (VCE)
Description
This study investigates microseism noise, a distinct sound occurring within 2 to 20 seconds, known as the loudest frequency in Earth's background noise. Focusing on the Indian Ocean, researchers analyzed the magnitude and direction of subtle movements using data from ten land-based stations across the region. Microseism characteristics were described using probability power spectral density, examining variations in vibration frequencies with Eigenvalue decomposition to understand three-dimensional vibration dispersion. Findings reveal that the Indian Ocean significantly contributes to global microseism, with certain stations displaying dual-frequency microseism periods of 2 to 5 seconds and 6 to 10 seconds. The study highlights that low-frequency seismic activity is largely influenced by the Southern Ocean. A comparative analysis showed a correlation between wave height and sound wave intensity across locations and time frames. Additionally, common wave types within the microseism band on Earth’s surface were reviewed, with a particular focus on Rayleigh waves over extended periods.
Abstract
Within a span of 2 to 20 seconds, microseism noise occurs as a distinctive sound. It is the loudest band of sound in the earth's background noise. In this study, we looked at the size and direction of the small movements in the Indian Ocean. Data is gathered from a network of ten land stations located at various points across the Indian Ocean.
The description of microseism was achieved by utilizing the probability power spectral density. To understand the microseism, we use a method that looks at how the vibration changes with different frequencies. This method uses a mathematical calculation called Eigenvalue decomposition to analyze the way the vibrations spread in three different directions. We studied how microseism changes over space and time in the Indian Ocean area. The Indian Ocean is considered a major contributor to microseism worldwide. In certain stations, we can see that the double frequency microseism breaks down into short periods of 2 to 5 seconds and long periods of 6 to 10 seconds.
The study shows that the main causes of the continuous low-frequency seismic vibrations come from the Southern Ocean. In addition, we conducted a comparison between the alterations in wave heights and the intensity of waves at each particular site. It was evident that sound wave intensity and wave height within a particular frequency range were closely linked. This connection was observed both in different places and at different times. We additionally encompass an overview of the prevalent wave types detected in the microseism band on the Earth's surface. Over an extended duration, Rayleigh waves are the prevalent ones, whereas Love waves tend to be more prominent in shorter intervals.