Earthquakes unveil deep rock structure under East Asia

May 15, 2015

Washington, May 15: Scientists have found a towering rock structure deep under East Asia by using 3-D supercomputer simulations of data from 227 earthquakes that hit the region during 2007-2011.

deep rock

The finding could throw light on the fate of the subducted continental plates beneath the Tibetan Plateau, known as ‘the roof of the world,’ which rises about 5km above sea level.

The work may also help find hidden hydrocarbon resources, and more broadly it could help explore the Earth under East Asia and the rest of the world, researchers said.

“We are combining different kinds of seismic waves to render a more coherent image of the Earth,” said principal investigator and lead author Min Chen from the Rice University.

Researchers combined seismic records from thousands of stations for each earthquake to produce scientifically accurate, high-resolution 3-D tomographic images of the subsurface beneath immense geological formations.

Like a thrown pebble generates ripples in a pond, earthquakes make waves that can travel thousands of miles through the Earth.

A seismic wave slows down or speeds up a small percentage as it travels through changes in rock composition and temperature.

The scientists mapped these wave speed changes to model the physical properties of rock hidden below ground.

“We found that beneath the Tibetan plateau, the world’s largest and highest plateau, there is a sub-vertical high velocity structure that extends down to the bottom of the mantle transition zone,” the principal investigator said.

The bottom of the transition zone goes to depths of 660 kilometres, she said.

“Three-dimensional geometry of the high velocity structure depicts the lithosphere beneath the plateau, which gives clues of the fate of the subducted oceanic and the continental parts of the Indian plate under the Eurasian plate,” she added.

The research was published in the Journal of Geophysical Research, Solid Earth.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
Agencies
May 30,2020

New Delhi, May 30: The Congress on Friday described the first year of the Modi government as a "year of disappointment, disastrous management and diabolical pain".

Congress leader K C Venugopal said the six years of the Modi dispensation have seen fraying of bonds of empathy, fraternity and brotherhood with increase in acts of communal and sectarian violence.

Congress chief spokesperson Randeep Surjewala said that at the end of six years, it appears the Modi government is at war with its people and is inflicting wounds on them, instead of healing them.

"It is inflicting wounds on Mother India," he said.

"This government is trying to fill coffers of the select rich and is inflicting pain on the poor," Surjewala said.

On the BJP's charge of the Congress playing politics over the COVID-19 crisis, Venugopal said the opposition party did not indulge in any politics and gave suggestions instead.

"Being a responsible opposition, it is our duty to raise the problems faced by the common people. As opposition, we highlighted the failures of the government," he said.

Venugopal said the government "is totally insensitive" to the plight of migrant labourers and farmers.

Surjewala also demanded that a virtual session of Parliament be convened immediately to discuss pressing issues and the due process be set in motion for holding of meetings of various parliamentary committees.

Modi and his cabinet had taken oath on this day last year for a second term in office.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
News Network
May 20,2020

Thiruvananthapuram, May 20: As COVID-19 count surges to 666 with 24 new cases reported on Wednesday, Kerala Chief Minister Pinarayi Vijayan has said that if cases keep increasing in this manner, then the State will be in a 'serious situation.'

Out of 24 new patients, 12 have returned from abroad, 11 others from other States and one has been infected by a contact. Now, total positive cases in the State stand at 666 including 161 active cases, Chief Minister Vijayan said at press meet.

"If the number of COVID-19 cases increases like this, then the State will be in a serious situation. We have given more relaxations in lockdown guidelines. We need to have more strict measures in some areas," he said.

Speaking about the people who are coming to Kerala from other States, he stressed that all people coming from outside are "not carriers." However, the State has to tighten the security as some among those people are "carriers."

The Chief Minister while clearing that there is no restriction for the people to come back to Kerala, said: "Lakhs of people residing in other states cannot come together."

"There is no relaxation in containment areas. Those who came from outside have to be in quarantine. This is their moral responsibility. The State has implemented home quarantine successfully. Various level committees like ward committee, neighbours and residential associations are monitoring the people in quarantine," he said.

Chief Minister Vijayan has directed the police to visit people under home quarantine to take their report and district panchayat to make sure that all panchayats are working in a proper manner.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.
Agencies
June 21,2020

New Delhi, June 21: Diesel prices rise to record high after 60 paise hike in rates, petrol up 35 paise; rates up by Rs 8.88 and Rs 7.97 in 15 days.

Petrol price in Delhi was hiked to Rs 79.23 per litre from Rs 78.88, while diesel rates were increased to Rs 78.27 a litre from Rs 77.67, according to a price notification of state oil marketing companies. 

In Bengaluru, petrol will be costlier by 37 paise at Rs 81.81 per litre, while diesel will cost 57 paise more per litre at Rs 74.43.

Rates have been increased across the country and vary from state to state depending on the incidence of local sales tax or VAT.

The 15th daily increase in rates since oil companies on June 7 restarted revising prices in line with costs after ending an 82-day hiatus in rate revision, has taken diesel prices to a new high. The petrol price too is at a two-year high.

Over 63 per cent of the retail selling price of diesel is taxes. Out of the total tax incidence of Rs 49.43 per litre, Rs 31.83 is by way of central excise and Rs 17.60 is VAT. 

Petrol in Mumbai costs Rs 86.04 per litre and diesel is priced at Rs 76.69.

Prior to the current rally, the peak diesel rates had touched was on October 16, 2018 when prices had climbed to Rs 75.69 per litre in Delhi. The highest-ever petrol price was on October 4, 2018 when rates soared to Rs 84 a litre in Delhi.

When rates had peaked in October 2018, the government had cut excise duty on petrol and diesel by Rs 1.50 per litre each. State-owned oil companies were asked to absorb another Re 1 a litre to help cut retail rates by Rs 2.50 a litre.

Oil companies had quickly recouped the Re 1 and the government in July 2019 raised excise duty by Rs 2 a litre.

The government on March 14 hiked excise duty on petrol and diesel by Rs 3 per litre each and then again on May 5 by a record Rs 10 per litre in case of petrol and Rs 13 on diesel. The two hikes gave the government Rs 2 lakh crore in additional tax revenues.

Oil PSUs Indian Oil Corp (IOC), Bharat Petroleum Corp Ltd (BPCL) and Hindustan Petroleum Corp Ltd (HPCL), instead of passing on the excise duty hikes to customers, adjusted them against the fall in the retail rates that was warranted because of a decline in international oil prices to two-decade lows.

International oil prices have since rebounded and oil firms are now adjusting retail rates in line with them.

In 15 days of hike, petrol price has gone up by Rs 7.97 per litre and diesel by Rs 8.88 a litre.

Comments

Add new comment

  • Coastaldigest.com reserves the right to delete or block any comments.
  • Coastaldigset.com is not responsible for its readers’ comments.
  • Comments that are abusive, incendiary or irrelevant are strictly prohibited.
  • Please use a genuine email ID and provide your name to avoid reject.