Seismic Waves From Intense Storms Can Ripple Through Earth’s Core : ScienceAlert

Researchers Discover Echo of Cyclones Moving Ocean Waters Across the Globe

Scientists have recently been able to detect the reverberations of cyclones swirling ocean waters from afar, providing valuable insights into Earth’s geological structure.

Microseismic waves, generated by the interaction between the ocean and the Earth’s crust, offer a unique opportunity to explore hidden parts of the planet’s subsurface, particularly in regions where traditional earthquake activity is scarce, such as the North Atlantic.

“Our study utilizes these microseismic events as an unconventional source of data to investigate the Earth’s composition beneath Australia,” explained seismologist Hrvoje Tkalčić from the Australian National University.

The intense storm activity, such as cyclones, over the ocean releases acoustic energy that can penetrate through the Earth.

However, these vibrations become extremely subtle by the time they pass through the Earth’s core. To detect and analyze these seismic waves, Tkalčić and fellow seismologist Abhay Pandey utilized sophisticated arrays of sensors placed in remote areas of Australia.

“By combining data from multiple days, we were able to pinpoint the regions where these signals were strongest, offering insights into the origin and propagation of the seismic waves,” Pandey elaborated.

“The signals are of minuscule amplitude and often fall below the detection threshold of a single sensor, necessitating specialized instrument designs to capture them.”

The researchers successfully traced these signals back to the waters near Greenland and Newfoundland, stirred up by winter storms.

“The Newfoundland basin serves as a significant and consistent source of microseisms detected on numerous days during the study period, likely tied to the movement of frequent cyclones in the winter season,” Pandey and Tkalčić noted in their research paper.

Furthermore, this innovative approach to monitoring signals through the Earth could have implications for the exploration of other planets and moons.

“In an era of interplanetary journeys, it is conceivable that we may harness storm energy to enhance our understanding of planetary interiors and the atmospheres of various moons and planets in the foreseeable future,” the researchers concluded.

The findings of this study were published in the Seismological Research Letters journal.