Scientists are developing a new method for determining how rapidly the Indian Ocean is warming by analyzing the sounds of earthquakes – Technology News, Firstpost

Press Trust of India, 21 Sep 2020, 11:47:44 am

Scientists have developed a new method for determining how rapidly the Indian Ocean is warming by analyzing the sound from sea floor earthquakes, an advance that could lead to a relatively inexpensive technology for monitoring water temperatures in all oceans.

According to the researchers, including researchers from the California Institute of Technology (Caltech) in the US, up to 95 percent of the excess heat trapped on Earth due to greenhouse gases like carbon dioxide is present in the world’s oceans, making them significant. To monitor the temperature of ocean water.

Scientists said the ocean could warm up to 70 percent more than previously thought. Image credit: Pixabay

In the current study, published in the journal Science, scientists used current earthquake monitoring equipment, as well as historical data on earthquakes, to determine how much ocean temperature is changing and continuing to change, even at depths that are usually beyond the reach of traditional tools.

They assessed a section of 3,000 km in the eastern tropical Indian Ocean and found temperature fluctuations between 2005 and 2016, with a decadal warming trend that “greatly exceeds previous estimates”. According to one estimate, the scientists said that the temperature of the ocean could be about 70 percent warmer than previously thought. However, they cautioned against drawing any immediate conclusions, as more data needed to be collected and analyzed.

Jorn Callies, a co-author of the study from Caltech, noted that the method works by observing the sounds of underwater earthquakes, which are powerful and travel long distances across the ocean without being significantly weakened. Researchers explained that when an earthquake occurs under the ocean, most of its energy travels through the earth, but part of this energy travels into the water as sound.

They said that these sound waves propagate outward from the epicenter just like seismic waves traveling across the Earth, but they added that the sound is moving at a much slower speed. The study indicated that ground waves reach a seismic station first, followed by sound waves, which will appear as a secondary signal for the same event. This effect, according to the researchers, is similar to how one sees a flash of lightning seconds before hearing the thunder.

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