Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Nea Kameni volcano movement captured by Envisat

23.05.2012
Archived data from the Envisat satellite show that the volcanic island of Santorini has recently displayed signs of unrest. Even after the end of its mission, Envisat information continues to be exploited for the long-term monitoring of volcanoes.
Santorini is a picturesque Greek island in the south Aegean Sea and the most active volcanic centre in the South Aegean Volcanic Arc.
The island is the site of one of history’s largest volcanic eruptions, about 3600 years ago. The geological record over the past million years reveals an extensive history of eruptions, with the most recent occurring in 1950.

But despite being dormant for over half a century, satellites have detected slight movements.

These and other findings were presented at the International Forum on Satellite Earth Observation for Geohazard Risk Management, currently under way in Santorini itself.

Organised by ESA in partnership with the Group on Earth Observations (GEO), the forum is focusing on the science and applications of satellite Earth observation to support the management of risks associated with geophysical hazards.

Seismic activity in Santorini, such as the underground movement of magma, from January 2011 to today has caused ground deformation that was detected by Envisat’s radar.

Even from an orbit about 800 km above the ground, deformations of a few centimetres can be detected by satellite radars.

When two or more radar images of the same area are combined, changes in signal reflections between them can be measured. This technique called Differential Interferometric Synthetic Aperture Radar – or DInSAR – has become a useful tool for detecting ground deformation.

Envisat shows that the northeastern part of Santorini’s Nea Kameni volcano experienced an uplift of about 5 cm in 2011, while other areas of the volcano rose some 3–4 cm.

"Monitoring to detect any change of the status of the volcano presents a further step towards the understanding of physical processes related to volcanic eruptions that can lead to natural disasters," said Prof. Issaak Parcharidis from the Department of Geography at the Harokopio University of Athens.

During the first months of this year, Santorini saw a drop in the speed of deformation, accompanied by a reduction in seismic activity.

"After evaluation of local seismic activity, deformation and physicochemical changes, [we] concluded that during the last months the volcano presents a very limited activity, much lower than that of 2011," said Prof. Kosmas Stylianidis, Head of the Special Scientific Committee for the Monitoring of Santorini Volcano.

"The Committee, in its monthly report of April to the government, advises the application of no restrictive measure concerning the mobility of population."

Contact with Envisat was lost on 8 April, but ten years of archived data from the mission will continue to be used by scientists for monitoring volcanoes and many other studies.

The continuation of observation from coming satellite missions, such as the family of Sentinels under Europe’s Global Monitoring for Environment and Security programme, is crucial for ensuring data flow to scientists and operational users dealing with hazard and risk assessment.

Robert Meisner | EurekAlert!
Further information:
http://www.esa.int/SPECIALS/Envisat/SEMEQUYWD2H_0.html

More articles from Earth Sciences:

nachricht Predicting eruptions using satellites and math
28.06.2017 | Frontiers

nachricht NASA sees quick development of Hurricane Dora
27.06.2017 | NASA/Goddard Space Flight Center

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Supersensitive through quantum entanglement

28.06.2017 | Physics and Astronomy

X-ray photoelectron spectroscopy under real ambient pressure conditions

28.06.2017 | Physics and Astronomy

Mice provide insight into genetics of autism spectrum disorders

28.06.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>