Geological interpretation of current subsidence and uplift in the London area, UK, as shown by high precision satellite-based surveying
  • 【DOI】

    10.1016/j.pgeola.2013.07.003

  • 【摘要】

    AbstractLong term planning for flood risk management in coastal areas requires timely and reliable information on changes in land and sea levels. A high resolution map of current changes in land level... 展开>>AbstractLong term planning for flood risk management in coastal areas requires timely and reliable information on changes in land and sea levels. A high resolution map of current changes in land levels in the London and Thames estuary area has been generated by satellite-based persistent scatterer interferometry (PSI), aligned to absolute gravity (AG) and global positioning system (GPS) measurements. This map has been qualitatively validated by geological interpretation, which demonstrates a variety of controlling influences on the rates of land level change, ranging from near-surface to deep-seated mechanisms and from less than a decade to more than 100,000 years鈥?duration.During the period 1997鈥?005, most of the region around the Thames estuary subsided between 0.9 and 1.5?mm?a鈭? on average, with subsidence of thick Holocene deposits being as fast as 2.1?mm?a鈭?. By contrast, parts of west and north London on the Midlands Microcraton subsided by less than 0.7?mm?a鈭?, and in places appear to have risen by about 0.3?mm?a鈭?. These rates of subsidence are close to values determined previously by studies of Quaternary sequences, but the combined GPS, AG and PSI land level change data demonstrate a new level of local geological control that was not previously resolvable. 收起<<

  • 【作者】

  • 【刊期】

    Proceedings of the Geologists' Association 2014年1期

  • 【语种】

    eng