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In a study conducted in 117 countries, researchers have found that the world is experiencing the most dramatic reduction in the seismic noise (the hum of vibrations in the planet's crust) in recorded history due to global COVID-19 lockdowns.

Measured by instruments called seismometers, seismic noise is caused by vibrations within the Earth, which travel like waves and the waves can be triggered by earthquakes, volcanoes, and bombs - but also by daily human activity like travel and industry.

This quiet period was likely caused by the total global effect of social distancing measures, closure of services and industry, and drops in tourism and travel, the study published in the journal Science, reported.

The new research, led by the Royal Observatory of Belgium and five other institutions around the world including Imperial College London (ICL), showed that the dampening of 'seismic noise' caused by humans was more pronounced in more densely populated areas.

"Our study uniquely highlights just how much human activities impact the solid Earth, and could let us see more clearly than ever what differentiates human and natural noise," said study co-author Stephen Hicks from ICL in the UK.

For the findings, the research team looked at seismic data from a global network of 268 seismic stations in 117 countries and found significant noise reductions compared to before any lockdown at 185 of those stations.

Researchers tracked the 'wave' of quietening between March and May as worldwide lockdown measures took hold.

The largest drops in vibrations were seen in the most densely populated areas, like Singapore and New York City, but drops were also seen in remote areas like Germany's the Black Forest and Rundu in Namibia.

Citizen-owned seismometers, which tend to measure more localised noise, noted large drops around universities and schools around Cornwall, UK and Boston, US - a drop in noise 20 per cent larger than seen during school holidays.

The findings showed that countries like Barbados, where lockdown coincided with the tourist season, saw a 50 per cent decrease in noise.

"The changes have also given us the opportunity to listen in to the Earth's natural vibrations without the distortions of human input," the study authors wrote.

Earlier in April, a study published in the journal Nature, reported at least a 30 per cent reduction in that amount of ambient human noise since lockdown began in Belgium.

New Delhi, Jan 19: Reacting to a tweet by ace lawyer Indira Jaising urging her to forgive the four men on death row for brutally raping that finally took her life, Nirbhaya's mother said on Saturday: "Even if God asks me, I won't forgive them."

Speaking to news agency, over the phone, the mother who had been fighting for seven long years to send her daughter's killers to the gallows, said, "...even if god comes and asks me to forgive them, I will not. People like these (Jaising) are a blot on the society."

Commenting on Jaising's tweet, she said: "Who is she to tell or suggest to me to forgive them. What relation does she have with me. I have nothing to do with such people. She can be a relative of those (the convicts) that she is having a soft corner for."

"She is an insult to women. She is running a business in the name of human rights. She is a veteran, she should give a message to the society. But she instead will go against her own kind," she added.

Earlier in the day, Jaising had requested Nirbhaya's mother to follow the example of Congress president Sonia Gandhi, who had moved for the clemency of a woman, Nalini Murugan convicted for the assassination of her husband and former Prime Minister Rajiv Gandhi.

"While I fully identify with the pain of Nirbhaya's mother I urge her to follow the example of Sonia Gandhi who forgave Nalini and said she didn't want the death penalty for her. We are with you but against death penalty," Jaising tweeted on Friday.

A Delhi Court on Friday issued fresh death warrants against the four convicts -- Akshay, Pawan, Mukesh and Vinay in the Nirbhaya gang rape and murder case.

Additional Sessions Judge (ASJ) Satish Kumar Arora fixed 1 February as the date of execution of the four death row convicts. They will be hanged at 6am.

The move came after the prosecution moved an application seeking issuance of fresh death warrants following the rejection of the mercy plea of one of the convicts Mukesh by President Ram Nath Kovind.

The 23-year-old victim was brutally gang-raped and tortured on December 16, 2012, which later led to her death.

All the six accused were arrested and charged with sexual assault and murder. One of the accused was a minor and appeared before a juvenile justice court, while another accused committed suicide in Tihar Jail.

Four of the convicts were sentenced to death by a trial court in September 2013, and the verdict was confirmed by the Delhi High Court in March 2014 and upheld by the Supreme Court in May 2017, which also dismissed their review petitions.

New Delhi, Jan 15: The mother of 23-year-old paramedic student, who was raped and brutally assaulted by six men in December 2012, on Tuesday said she knew that the curative petitions of the convicts will be rejected and is confident that they will be hanged on January 22.

Her remarks came after the Supreme Court on Tuesday refused to stay the execution of two of the four death row convicts in the 2012 Nirbhaya gang rape and murder case while dismissing their curative petitions against their conviction and capital punishment.

"The curative please had to be rejected. This was the third time they had gone to the Supreme Court. Whatever pleas they file, we are ready to face them and we will fight it out. We feel that they will be hanged on January 22. We want that to happen," Nirbhaya's mother told PTI over phone.

The four convicts -- Vinay Sharma (26), Mukesh Kumar (32), Akshay Kumar Singh (31) and Pawan Gupta (25) -- are to be hanged on January 22 at 7 am in Tihar jail as a Delhi court issued their death warrants on January 7.

Vinay and Mukesh had filed curative petitions on January 9.

Shortly after the apex court refused to stay the execution of two of them, Mukesh moved a mercy petition before President Ram Nath Kovind.

Mukesh also approached the Delhi High Court for quashing the death warrant. The high court is expected to take up his petition on Wednesday.