As summer’s around the corner, is the warmer weather to blame for the recent sinkholes in Durham and Dorset? Using specialist GIS software and geology knowledge, Tim explores why two separate sinkholes appeared last week…
St Alban's Sinkhole: Part 2 - Terrafirma explore the possible causes of the recent St Albans sinkhole for a recent @BBC3CR radio interview…
Explore the legacy the UK's once great coal mining industry has left on property and land in Terrafirma's new Infographic. With almost a third of all buildings in the UK underlain by coal mines, over 9000 recorded hazards and a new mining subsidence claim made every week of the year…
Terrafirma, an expert provider of environmental information and data intelligence, today launched the Ground Report, a risk and liabilities report designed to enable property professionals to better identify, manage and resolve ground and environmental hazards…
Late on Saturday 28th April, a 40ft deep and 3ft wide hole opened in a car park in Garth-An-Creet, St. Ives, Cornwall. Local emergency services were called to assess the scene and undertake work to prevent the hole from widening and affecting nearby properties. Subsequent investigation by Terrafirma concludes the hole was created by the collapse of a disused mine shaft.
A sinkhole reported on 02/04/18 has appeared in Merthyr Tydfil within a new build site, Cwrt Aneurin Bevan. The sinkhole which is reportedly 20 ft (6m) deep has resulted in local residents losing access to their new homes.
Delve behind the scenes of the Channel 5 documentary on Sinkholes.
The word sinkhole has become a term broadly used term to describe any hole in the ground created by erosional processes and the drainage of water. Ground hazards in the UK are often synonymous with the word sinkhole which can span from just a few feet in diameter to gigantic chasms large enough to swallow whole buildings.
They can have devastating consequences as can be seen on the new three-part Sinkhole documentary which began on Monday 20 November on Channel 5 and features extensive commentary from sinkhole expert and Terrafirma CEO and founder, Tom Backhouse.
Terrafirma CEO Discusses Lender Policy on Mine Entries.
Earlier today, Terrafirma's CEO and Founder, Tom Backhouse featured on the new series of the Rip Off Britain: Live Series on BBC One. Tom was invited on to offer advice to a frustrated home-owner who has fallen victim to her property being located close to an historical coal mine shaft, making it impossible to sell.
The property has seen its market value drop by £61,000 and despite being up for sale multiple times, it remained unsold earlier this year at a property auction in the West Midlands.
Land. A word that is defined by its ownership, purpose, value or location and is often viewed, from a local, regional or national economic perspective, for its agricultural or development potential. However, land in the UK is also defined by our geological and extraction history, both of which can pose significant risks to property, investment and people.
A sinkhole has been reported to have occurred within part of Beechwood Avenue, Cimla in South Wales. This is the second reported sinkhole in the neighbourhood after another ground collapse, later identified to be a mine shaft, opened up in January of 2016. The sinkhole is now being investigated to identify whether it is associated with the extensive shallow coal mining known to have occurred in the area during the 18th and 19th Centuries.
The collapse of a chalk mine in west Reading forced the immediate evacuation of dozens of residents. These residents then suffered for years due to the extensive and drawn out remediation of the affected area, but eventually had their patience rewarded after the works finished and the area declared safe once again.
A large sinkhole opened in the car park of Pinner Wood School, Harrow, forcing its immediate temporary closure. Geotechnical surveys and site investigations have been commissioned to determine the cause of the collapse and assess the stability of the land.
A sinkhole has formed during September 2015 on Bull Street, Lower Gornal Dudley, West Midlands. As a physical example of ground subsidence, the Bull Street Sinkhole (BSS) is hardly remarkable; with a diameter of >2ft and a depth of 6-9ft1, the BSS is a relic of historical mine workings, typical of those that form in the regions of the UK with a pronounced mining legacy.
In this instance, the degradation of historic shallow coal workings (the exploitation of coal seams at depths of <30m) triggered subsidence, though subsidence caused by the exploitation of a further 60 resources (tin, lead, copper, iron, sandstone, chalk and limestone just to name a few) is common across the UK.
On the 2nd May 2016 a sinkhole believed to be 60ft deep and 16ft wide opened up on the doorstep of one of Skillcrown Homes new developments within Brickfield Cottages, Plumstead. The result of which led to the establishment of a 25m hazard zone and evacuation of 50 residents by the combined effort of the emergency services and Hexagon Housing, all of which were provided with assistance at a council run rest centre and overnight accommodation by the housing association. Following this, on the 3rd May evacuated residents were reportedly staying with families or in hotels whilst structural engineers looked to secure the site. The result of which, 30 households were returned to normality, whilst 10 awaited contact by Hexagon Housing. The remediation efforts, whether planned, completed or on-going are unknown.
On 9th April 2016, a 20-foot-deep sinkhole appeared at Norwich’s Plantation Garden, causing subsidence cracks to the neighbouring hotel on Earlham Road. This is a stone’s throw away from the 1988 sinkhole which swallowed a double-decker bus. The Plantation Garden is itself an old chalk quarry, with multiple mining tunnels leading off it. It is the collapse of a mining tunnel that is thought to have caused this sinkhole.
In early 2015 at Lawrance Square, Northfleet, Gravesend, Kent – an extended period of subsidence culminating with the appearance of a sinkhole has forced several shops to close and evacuation of 7 sets of council tenants for fears of further subsidence.
On 1st October, 2015, a giant sinkhole opened up in Fontmell Close, St Albans forcing families to evacuate their homes and cutting off utilities to over 50 properties.