0698 - Ground Positioning System Network for Monitoring of Ground Subsidence

Theme:Modelling and Risk
Project status:Completed
Start date:01/04/1996
End date:31/03/2000
Contractor:
  • Nottingham University (Eng)
Contact:

PROJECT SUMMARY

Over the 2.25 year monitoring period, the geodetic results suggest that the changes in regional ground level in and around the London basin do not exceed a few millimetres per year, unless there is seasonal swell-shrink where London Clay is at the surface. Specifically, over the 2.25 year
monitoring period, the results suggest that:

- in relation to changes in sea level, there have been no significant changes in ground level at tide gauges along the Thames estuary.
- there have been no significant changes in ground level due to tectonic activity associated with the London basin and the Greenwich fault.
- there have been no significant changes in ground level due to aquifer recharge in the Enfield-Haringey area.
- there is some evidence for tectonic activity in the east of the Thames estuary, with the north side rising relative to the south side.