Subscribe free to our newsletters via your
. 24/7 Space News .

Slight surface movements on the radar
by Staff Writers
Paris (ESA) Mar 25, 2015

This radar interferogram combines two acquisition by Sentinel-1A radar from 20 January and 1 February 2015 over the Vestfonna and Austfonna ice caps on the Nordaustlandet Island, Svalbard. A strip of ice-free land sits between the two ice caps. Over the 12-day period, the outlet glaciers flowed at an average of 3 cm per day. Image courtesy Copernicus data (2015)/ESA / NORUT-PPO.labs-SEOM INSARAP study. For a larger version of this image please go here.

Scientists are making advances in the use of satellite radar data - such as those from the Sentinel-1 mission - to monitor Earth's changing surface. Italy's Phlegraean Fields - or Campi Flegrei - is a large, active volcanic area near the city of Naples near Mount Vesuvius. Since the 1970s, the ground has been rising owing to the volcanic nature of this area.

"In 2012, deformation rates up to 3 cm a month prompted the Italian Civil Protection Department to move from the base (green) alert level of the Campi Flegrei Emergency Plan to the attention (yellow) level," said Sven Borgstrom from Italy's National Institute for Geophysics and Volcanology.

"The uplift continues today: radar imagery from the Sentinel-1A satellite captured over the area between October 2014 and March 2015 show that the ground is rising by about 0.5 cm per month."

This is just one of the many findings being presented this week at the Fringe Workshop on advances in the science and applications of 'SAR interferometry' held at ESRIN, ESA's centre for Earth observation, in Frascati, Italy. Interferometric Synthetic Aperture Radar, or InSAR, is a remote sensing technique where two or more images of the same area are combined to detect slight changes occurring between acquisitions.

Tiny changes on the ground cause changes in the radar signal and lead to rainbow-coloured interference patterns in the combined image, known as an 'interferogram'. The Fringe Workshop takes its name from these coloured fringes seen in the interferograms.

Small movements - down to a scale of a few millimetres - can be detected across wide areas. Tectonic plates grinding past one another, the slow 'breathing' of active volcanoes, the slight sagging of a city street through groundwater extraction, and even the thermal expansion of a building on a sunny day.

This year, the workshop is paying particular attention to new results from the Sentinel-1 mission. Launched in April of last year, Sentinel-1A became the first satellite in orbit for Europe's Copernicus programme, and has been delivering important data for an array of operational and scientific applications.

In Norway's Svalbard archipelago, Sentinel-1 data are being used to monitor ice loss from the Austfonna ice cap. Earlier this year, the satellite captured the ice cap's outlet glacier flowing at 3 cm per day.

With over 420 participants, this year's Fringe workshop has seen the largest turnout since its inauguration in 1991 - when four specialists met to discuss the early InSAR results from the ERS-1 mission. Radar interferometry has come a long way since, with contributions from satellites such as Envisat and now Sentinel-1A.

Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceDaily Contributor
$5 Billed Once

credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly

paypal only


Related Links
Observing the Earth at ESA
Space Technology News - Applications and Research

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

USMC orders targeting system from Elbit Systems America
Fort Worth, Texas (UPI) Mar 23, 2015
The U.S. Marines are to receive a new lightweight all-weather targeting capability from Elbit Systems America LLC through a new IDIQ contract. The indefinite-delivery/indefinite-quantity award for the Common Laser Range Finder-Integrated Capability, or CLRF-IC, is worth $73.4 million and extends through March of 2020. Elbit Systems America, a subsidiary of Elbit Systems Ltd of Is ... read more

Extent of Moon's giant volcanic eruption is revealed

Yutu Changes Everything We Thought We Knew About Our Moon

Extent of moon's giant volcanic eruption is revealed

NASA's LRO Spacecraft Finds March 17, 2013 Impact Crater and More

Ancient Martian lake system records 2 water-related events

Curiosity Rover Finds Biologically Useful Nitrogen on Mars

NASA's Opportunity Mars Rover Passes Marathon Distance

NASA Reformats Memory of Longest-Running Mars Rover

50 years ago today, space welcomed its first sandwich

Small Staff has Big Impact Showing How NASA Can Engage Students

TED Prize winner wishes for archive of human wisdom

The Science Of The Start-Up

China completes second test on new carrier rocket's power system

China's Yutu rover reveals Moon's "complex" geological history

China's Space Laboratory Still Cloaked

China has ability but no plan for manned lunar mission: expert

One-Year Crew Set for Launch to Space Station

Russia, US May Sign New Deal to Send Astronauts to ISS

Lockheed Martin reveals new method for resupplying space station

Testing astronauts' lungs in Space Station airlock

Arianespace selected by Airbus to launch EDRS-C Satellite

US to Scrap Delta IV Launch Vehicle in Favor of Russian-Made Rocket

Proton launches Express AM-7 satellite for Russian Government

DoD Works to Build Competition Into Space Launches

Our Solar System May Have Once Harbored Super-Earths

SOFIA Finds Missing Link Between Supernovae and Planet Formation

ESA's CHEOPS Satellite: The Pharaoh of Exoplanet Hunting

Some habitable exoplanets could experience wildly unpredictable climates

Want to snag a satellite? Try a net

Slight surface movements on the radar

Spacecraft Power Systems

Processing Paradigms That Accelerate Computer Simulations

The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.