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OIL AND GAS
First coast-to-coast land motion map of Scotland derived from satellite radar images
by Staff Writers
Nottingham UK (SPX) Nov 08, 2017


This photo show Dr. Stephen Grebby of the University of Nottingham (seated) and Dr. Andy Sowter of GVL (standing) discussing the relative land motion map of Scotland

The first country-wide map of relative land motion has been created by a team at the University of Nottingham. Using hundreds of satellite radar images the team, working with Geomatic Ventures Limited (GVL), an innovative University spin-out company, created a complete map of mainland Scotland.

The map covers a two-year period from 2015 to 2017 and was created using Intermittent Small Baseline (ISBAS) analysis, a novel satellite remote sensing technique. It showed that small but significant rates of land motion are occurring across almost the entire landscape.

Rural areas are marked by subsidence over peatlands and landslides on steep slopes. In contrast, the urban and industrialised areas of the Scottish Midlands clearly show the effects of historical coal mining and civil engineering.

The map was created to illustrate the problems facing governments when regulating onshore oil and gas production and storage in a modern landscape influenced by industrial and land management practices.

For instance, there is a perceived threat of subsidence and a potential risk of earth tremors related to fracking - the practice of extracting oil and gas from shale rock. Although recently banned in Scotland, maps like this can help to screen locations to inform government regulators whether fracking can be reasonably monitored and deployed safely in other parts of the UK and around the world.

In addition, they can help the oil and gas industry engage with local communities to show that good practice is in place and their activities are having little effect upon the environment. Alternatively, regular monitoring using satellite techniques to track the vertical motion of the ground can be used to monitor the health of peatlands and detect landslides.

Dr Stephen Grebby, Assistant Professor in Earth Observation and lead university investigator on the project, explained the significance of the study, 'Tracking ground motion is also important for a wide range of other applications such as monitoring infrastructure, and this is not just limited to Scotland.

For example, our wide-area monitoring technique could be used to help identify and monitor ground instability issues along the whole stretch of the proposed HS2 route.

This would provide information that could ultimately influence the plans for the final route for Phase 2 of HS2, or at least highlight existing ground instability issues that may need to be addressed during construction of the network.'

Maps like this could therefore be seen as an important national asset to support risk assessment and mitigation, and consequently the design of future policies, the assessment of policy decisions and decision-making across a number of government departments.

Furthermore, this wide-area monitoring technique offers the future means of generating a European-wide relative land motion map. This would help to identify ground instabilities in urban and rural areas alike, with greater coverage than previously possible.

The current study showed that large areas of Scotland's vast lowland and highland peatland areas are dominated by subsidence. This is notable as collapsing peatlands are a significant source of greenhouse gases. According to the Scottish Natural Heritage, the carbon stored in Scotland's soils is equivalent to over 180 years of greenhouse gas emissions from Scotland at current emission rates.

Dr Andy Sowter, Chief Technology Officer of GVL, the company which processed the satellite images explained, 'If Scotland is to reach its climate change targets, which are currently under scrutiny by the UK Committee on Climate Change, land motion maps like this can provide vital evidence on the health of peatlands and with regular monitoring, the beneficial effect of peatland restoration towards improving the carbon balance.'

OIL AND GAS
Saudi Arabia seals Yemen borders, accuses Iran over missile strike
Riyadh (AFP) Nov 6, 2017
The Saudi-led coalition battling Shiite Huthi rebels in Yemen closed the country's air, sea and land borders Monday and accused Iran of being behind a weekend missile attack on Riyadh, saying it "may amount to an act of war". Saudi Arabia intercepted and destroyed the ballistic missile, which was launched from Yemen as rebels appeared to escalate hostilities, near Riyadh's international airp ... read more

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