Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Seismometer able to measure earth tremors over longer periods is unveiled

14.11.2008
Researchers from the Polytechnic University of Catalonia (UPC) and the Spanish Council for Scientific Research (CSIC) have developed an ocean bed seismometer that operates using a data acquisition and storage system based on CompactFlash memory cards such as those used in commercial digital cameras. The machine’s low energy consumption means it can operate independently for two months at depths of up to 6,000 metres.

A group of researchers has presented the new ocean bottom seismometer (OBS) in the magazine IEEE Transactions on instrumentation and measurement. Thanks to its low consumption batteries, the machine can monitor earth tremors using passive seismic techniques for long continuous periods in the ocean depths.

“Until not long ago, OBS were only able to operate independently for periods of 15 days or a month, but this model can carry on collecting data for up to two months,” Shahram Shariat Panahi, one of the report’s authors and a scientist at the UPC’s Department of Electronic Engineering, told SINC.

The seismometer has already been trialled in the waters off Tarragona and Vigo at depths of 1,000 metres, but it is able to withstand pressures in ocean trenches up to 6,000 metres below the surface. During the trials, 20 teams worked in the area to gather information about the thickness of each layer in the ocean floor and the materials from which these were made, down to a depth of 40 kilometres.

The potential of passive seismics

A compressed air cannon is used to periodically simulate small artificial tremors in the form of acoustic waves that are reflected and refracted within the different layers of the sea bed, and are then picked up by the OBS’ sensors. The seismometer converts the analogical signal into digital data, which are stored on memory cards.

The seismometer also performs well because of its small size, low weight, low electronic noise levels, and the use of CompactFlash memory cards similar to commercial ones that act like hard discs, and can store up to 56 GB of information.

The researchers are currently developing 10 more OBS, which they hope will permit even longer independent functioning of up to six months. This project, which will involve new tests around the Spanish coast, will last for two years and will use the new design during seismic refraction campaigns on the sea bed.

SINC Team | alfa
Further information:
http://www.plataformasinc.es

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 >>>