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Analysing thousands of recordings of seismic waves, or sound waves travelling through the Earth, scientists have detected widespread, heterogenous structures — areas of unusually dense, hot rock — at the core-mantle boundary than previously known.
The new research, published in the journal Science, provides the first comprehensive view of the core-mantle boundary over a wide area with such detailed resolution.
The researchers focused on echoes of seismic waves travelling beneath the Pacific Ocean basin.
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Their analysis revealed a previously unknown structure beneath the volcanic Marquesas Islands in the South Pacific and showed that the structure beneath the Hawaiian Islands is much larger than previously known.
“By looking at thousands of core-mantle boundary echoes at once, instead of focusing on a few at a time, as is usually done, we have gotten a totally new perspective,” said Doyeon Kim, a postdoctoral fellow in the University of Maryland Department of Geology and the lead author of the paper.
“This is showing us that the core-mantle boundary region has lots of structures that can produce these echoes, and that was something we didn’t realise before because we only had a narrow view.”
Earthquakes generate seismic waves below Earth’s surface that travel thousands of miles. When the waves encounter changes in rock density, temperature or composition, they change speed, bend or scatter, producing echoes that can be detected.
Echoes from nearby structures arrive more quickly, while those from larger structures are louder. By measuring the travel time and amplitude of these echoes as they arrive at seismometers in different locations, scientists can develop models of the physical properties of rock hidden below the surface. This process is similar to the way bats echo-locate to map their environment.
For this study, Kim and his colleagues looked for echoes generated by a specific type of wave, called a shear wave, as it travels along the core-mantle boundary.
In a recording from a single earthquake, known as a seismogram, echoes from diffracted shear waves can be hard to distinguish from random noise. But looking at many seismograms from many earthquakes at once can reveal similarities and patterns that identify the echoes hidden in the data.
Using a machine learning algorithm called Sequencer, the researchers analysed 7,000 seismograms from hundreds of earthquakes of 6.5 magnitude and greater occurring around the Pacific Ocean basin from 1990 to 2018.
Sequencer was developed by the new study’s co-authors from Johns Hopkins University and Tel Aviv University to find patterns in radiation from distant stars and galaxies. When applied to seismograms from earthquakes, the algorithm discovered a large number of shear wave echoes.
The study revealed a few surprises in the structure of the core-mantle boundary.
“We found echoes on about 40 per cent of all seismic wave paths,” said Vedran Lekic, an associate professor of geology at the University of Maryland and a co-author of the study.
“That was surprising because we were expecting them to be more rare, and what that means is the anomalous structures at the core-mantle boundary are much more widespread than previously thought.”
The scientists found that the large patch of very dense, hot material at the core-mantle boundary beneath Hawaii produced uniquely loud echoes, indicating that it is even larger than previous estimates.
This study also found a previously unknown ultralow-velocity zones beneath the Marquesas Islands.
Better understanding of the shape and extent of the structures at the core-mantle boundary can help reveal the geologic processes happening deep inside Earth. This knowledge may provide clues to the workings of plate tectonics and the evolution of our planet. (IANS)
Amitabh Bachchan is adored by the public for his unforgettable on-screen performances as well as his magnetic demeanour. Not only do fans love Amitabh Bachchan's outstanding performance, but the actor's heartwarming words are also highly regarded. A much moved Amitabh Bachchan, during his speech to the crowd of over 80,000 people at the Reliance Industries' annual event, said that the legacy left by Dhirubhai has had a positive impact on millions of people's lives worldwide.
When Bollywood superstar Amitabh Bachchan became bankrupt in the late 1990s, Dhirubhai Ambani stepped forward to give him financial assistance. In his speech, Bachchan remembered that Dhirubhai had sent Anil Ambani to offer him financial assistance during the crisis, which he had respectfully declined. Lenders began knocking on his door, losses mounted, and his bank account dwindled to nothing. He said, "Dhirubhai's money might have gotten me out of the problem quickly. However, I respectfully declined his offer and gradually began to find work again, which let me pay off my debt."
Amitabh Bachchan is adored by the public for his unforgettable on-screen performances as well as his magnetic demeanour. | Flickr
Later, after Bachchan had recovered from the bankruptcy, one day he was invited to an event at Dhirubhai's residence; Bachchan added, "Dhirubhai was standing and having a chat with his industrialist friends when he saw me there, he called me, firstly I felt shy even to present myself in front of such big industrialists but then, I went there, and Dhirubhai declared in front of all of them that 'This young man had fallen but managed to get back up on his own, I have a lot of respect for him because of that.' Those words of his were worth much more to me than any amount of money that he could have offered me."
It was the "Reliance Family Day" event and was attended by members of the Ambani family from all generations. The event commemorated the company's 40-year journey since its inception. It also celebrated the 85th birthday of the late Dhirubhai Ambani, RILs (Reliance Industries Limited) founder.
Keywords: Bollywood, Reliance, Amitabh Bachchan, Dhirubhai Ambani, event
In comparison to adults, children are prone to getting traumatized by troubling events easily, and this makes it important for parents to help their children when the times are tough. It could be a brutal accident, an unprecedented pandemic, a violent crime, or other disasters but with the right parental support, children have a higher chance of coming out stronger from an awful situation.
Anuja Kapur, Psychologist shares few tips wherein you can assist your child when tough times comes calling:
Every child responds differently to disturbing events: What children feel about a current disaster in their life and how they react to it can come and go in waves. Children can act moody and withdrawn at times, struck with sorrow and fear at other times. There's no absolute "right" or "wrong" way to feel after a traumatic event so make sure not to dictate what your child or how your child should feel and react to the event.
Children can act moody and withdrawn at times, struck with sorrow and fear at other times. | Photo by Kat J on Unsplash
Encourage your child to be transparent: Just make sure you let your child know that whatever feelings they're experiencing is normal. The unpleasantness will pass if your child opens up about it and that the phase is temporary. While many teens may be reluctant to talk about their feelings with a parent, encourage them to confide in another trusted adult such as a family friend, relative, or a counselor and teacher. It's important to talkeeven if it's not with you.
Just make sure you let your child know that whatever feelings they're experiencing is normal. | Photo by Sebastián León Prado on Unsplash
Deter your child from reliving the disturbing event: Dwelling over, watching the footage, or imagining the event can be overwhelmingly stressful for children and this stress can even block their nervous system. However, to negate such things from happening encourage activities that keep your child's mind occupied so they're not obsessive about the event. You could encourage your children to read, play games together, or simply watch an uplifting movie.
Dwelling over, watching the footage, or imagining the event can be overwhelmingly stressful for children and this stress can even block their nervous system. | Photo by Юлія Дубина on Unsplash
Cocoon your child with warmth: In order to reassure your child that they are safe with you and feel secure, that the worst is over your physical affection is important in making them feel safe again. Teens may try to be tough through it and avoid being held, but they still need the proximity.
In order to reassure your child that they are safe with you and feel secure, that the worst is over your physical affection is important in making them feel safe again. | Photo by adrianna geo on Unsplash
Maintain routines. Establishing a predictable structure and schedule for your child's life can help to make the world seem more stable again. Try to maintain regular times for meals, homework, and family activities. Make sure your child accommodates time and space for rest, play, and fun. Keeping up with a schedule can help countercheck the obnoxious feeling of stress and worry in children about the future being dark, hopeless, and unpredictable.
Try to maintain regular times for meals, homework, and family activities. | Photo by Paico Oficial on Unsplash
Acknowledge and validate your child's concerns. The disastrous events in life may give place to unrelated fright and concerns in your child. However, understanding and accepting your child's present state is a comfort for the child. If at any point the child blames himself for the event make sure to make it clear and crisp the event was not their fault, you love them, and it's okay for them to feel upset, angry, or scared but not guilty.
Understanding and accepting your child's present state is a comfort for the child Photo by Jeremiah Lawrence on Unsplash
Irrespective of the age of your child, it is vital for parents to offer that extra support and assistance following an unsettling event. The traumatic event may bring up unrelated fears and issues in your child. However, by accepting their thoughts and replacing their fear with your love and direction, the ominous feelings will start to fade away. Eventually, the child will be able to return to a normal and healthy life. (IANS/ MBI)
Keywords: Kids, Help, stress, cope, routine, warmth, understanding, encourage, psychology, children
The European Commission, the executive arm of the European Union (EU), has announced plans for smartphone and other electronics manufacturers to fit a common USB-C charging port on their devices in an effort to reduce waste. In addition to phones, the rules will apply to other devices like tablets, headphones, portable speakers, videogame consoles, and cameras, reports The Verge. The decision will have a huge impact on Apple, as the company still uses its own Lightning connector to charge iPhones. The proposals only cover devices using wired, not wireless and a USB-C port is only mandatory for devices that charge using a cable.
"Chargers power all our most essential electronic devices | Photo by Solen Feyissa on Unsplash
"Chargers power all our most essential electronic devices. With more and more devices, more and more chargers are sold that are not interchangeable or not necessary. We are putting an end to that," the report quoted EU commissioner Thierry Breton as saying.
The Commission also wants to unbundle the sale of chargers from the sale of electronic devices, which it says will improve the consumers' convenience. "With our proposal, European consumers will be able to use a single charger for all their portable electronics - an important step to increase convenience and reduce waste." In addition, the Commission will require manufacturers to provide relevant information about charging performance. (IANS/MBI)
Keywords: Electronic Devices, Chargers, Cable, smartphone, Adapters, Charging Cord