HOME >> MEDICINE >> NEWS
Envisat's rainbow vision detects ground moving at pace fingernails grow

Radar data from satellites such as ESA's Envisat are used to construct 'interferograms' that show millimetre-scale land movements. These rainbow-hued images provide scientists with new insights into tectonic motion, and an enhanced ability to calculate hazards arising when this slow motion speeds up, in the form of earthquakes or volcanic activity.

The ten-instrument payload on Envisat includes an Advanced Synthetic Aperture Radar (ASAR) instrument designed to acquire radar images of the Earth's surface. Part of Envisat's assigned 'background mission' as it orbits the world every 100 minutes is to prioritise ASAR acquisitions over the seismic belts that cover 15% of the land surface.

"By the time Envisat completes its nominal five-year mission we should have a satisfactory amount of images across all the seismic belts," said Professor Barry Parsons of the Centre for the Observation and Modelling of Earthquakes and Tectonics at Oxford University.

"To detect the fine ground deformation we are interested in, we require repeated radar images of each site. We then combine pairs of images together using a technique called SAR interferometry, or InSAR for short, to show up any change between acquisitions." (For more information see link: How does interferometry work?)

To accurately measure the slow build up of strain as tectonic plates move against each other along Earth's seismic belts, multiple interferograms are combined, requiring many individual SAR images.

"The reason for this is to minimise any atmospheric interference, relative to the small crustal deformation signal we are interested in," added Parsons. "Using data from Envisat's predecessor ERS, our group has recently measured tectonic movement across western Tibet with an accuracy of a few millimetres per year. The results show that slip rates across the major faults in the region are much smaller than had been previously thought and that the Tibetan plateau deforms
'"/>

Contact: Mariangela D'Acunto
mariangela.d'acunto@esa.int
39-06-941-80-856
European Space Agency
6-Aug-2004


Page: 1 2 3 4 5 6

Related medicine news :

1. Global air pollution map produced by Envisats SCIAMACHY
2. The physics of films, butterflies, banknotes and rainbows
3. U of M researcher says Viagra may cause permanent vision loss in some men
4. Kandel pays tribute to Hubels and Wiesels 25-year partnership and work in neurobiology & vision
5. Murder, eyewitness identification and the limits of human vision
6. Migraine-sparked vision loss may increase stroke risk in women; Migraine
7. Rehabilitation can restore some vision after stroke
8. Beyond supervision
9. University of Utah vision researchers identify genetic cause of rare eye disease in Utah family
10. Embark on a journey to better vision at UH
11. Researchers induce temporary blindness to learn more about vision

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:1/23/2020)... ... January 23, 2020 , ... DelawareBio, a nonprofit ... presents a panel discussion on gene editing that goes beyond CRISPR technology. To ... Medical Education Center, the event will provide an overview of the opportunities and ...
(Date:1/23/2020)... ... January 23, 2020 , ... MemoryCare.com ... has announced the Best Memory Care Facilities in Pensacola, Florida. The guide identifies ... amenities. , According to the Alzheimer’s Association , 5.6 million people ...
(Date:1/23/2020)... ... 23, 2020 , ... Today, The Fenway Institute of Fenway ... Administration dramatically expanded upon discriminatory, anti-LGBT policies implemented in 2017 and 2018 that ... the world. , “During Donald Trump’s third year as president, we moved from ...
(Date:1/23/2020)... ... January 23, 2020 , ... NowRx , the company ... County today with the grand opening of its state-of-the-art, 4,500 square foot, hyper-efficient, ... of a traditional pharmacy. NowRx uses an eco-friendly fleet of delivery cars ...
(Date:1/22/2020)... ... January 22, 2020 , ... “In preparation for our next ... systems,” said Bill Schnittker, LIDP Founder and CEO. “We introduced Titanium, a ground-breaking, robust ... claims processing systems suite. In 2019 LIDP launched CSR and Agent Portals.” , ...
Breaking Medicine News(10 mins):
(Date:1/24/2020)... ... , ... The American College of Physicians (ACP) has issued a bold call ... system. Recently, practicing internist and President of the ACP, Robert M. McLean, MD, MACP ... ACP, teamed with YourUpdateTV to discuss how the U.S. can fix its ailing health ...
(Date:1/23/2020)... ... January 23, 2020 , ... ... but can penetrate exposed dentin tubules allowing restorative adhesives to tightly bind to ... clearance to market FiteBac® Cavity Cleanser with 2% K21. Cavity cleansers are ...
(Date:1/23/2020)... (PRWEB) , ... January 23, 2020 , ... ... guidance to the managed care plans who administer benefits for Medi-Cal beneficiaries. The ... Parity and Addiction Equity Act (MHPAEA). MHPAEA prohibits limitations for mental health services ...
Breaking Medicine Technology:
Cached News: