I attended (and presented at) my first NSGG event yesterday!
The Postgraduate Research Symposium 2017 was focussed on the application of geophysical methodologies in geohazards assessment to mark the Geological Society’s “Year of Risk”, and showcased a wide variety of applications – it was incredibly interesting!
- Ground-penetrating radar survey in Ireland –overkill or a viable asset for archaeological survey?
- Kurtosis statistics as an indicator of the precision of migration velocity analysis.
A. Harding and A. Booth
- Predicting optimal forensic remote sensing and near – surface detection methods.
- Monitoring subsidence related to relict salt mines using long-term time-lapse microgravity, Marston, Cheshire, UK.
C.J. Rowell and J.K. Pringle
- Geophysical indicators of slope stability at the Hollin Hill LandslideObservatory: initial findings from repeated geophysical surveys.
- A hydrogeological assessment of a small peat bog in South Wales,using an integrated approach.
- Improved characterisation and modelling of measurement errors inelectrical resistivity tomography (ERT) surveys.
C.M. Tso, A. Binley and O. Kuras
- Integrated geophysical methods in meteorite impact investigation:case studies of Mahsuri Ring, Langkawi and Bukit Bunuh, Perak, Malaysia.
H. Saleh, A.R. Samsudin, U. Umar Hamzah, M.A.A. Jelani, M.H. Arifin and N. Sulaiman
- Subglacial Aquifer Characterisation using Multichannel Analysis of Surface Waves and Time -Domain Electromagnetic Techniques.
S. Prise, A. Booth, P. Livermore and J. West.
- Understanding how valley -glacier overdeepenings affect seasonaland glacial dynamics.
- Quantum Technology gravity sensors –first steps to aerial sensing.
D. Roberts, L. Earl, M. Wright, M. Uddin, N. Metje and M. Holynski
- Assessing surface and subsurface hydrological contamination at an abandoned metal mine in Mid-Wales, UK.
- Geophysical ground survey investigation for the possible HS2 route through Rugeley, Staffordshire, UK.
J. Francis and Z. Lloyd.
- A preliminary Ground Penetrating Radar study of fluvial architectures at Spireslack, Ayreshire, Scotland.
J.T. Ainsworth, A.J. Mitten and J.K. Pringle
I have added the abstracts to the presentations / posters presented at this NSGG event below, but for those interested, these can also be downloaded here (Original images not included in the below).
****UPDATE: THIS MEETING HAS BEEN POSTPONED UNTIL FURTHER NOTICE****
The date is looming: On the 16th June 2016, the Near Surface Geophysics Group (NSGG) of the Geological Society of London is holding a NSGG meeting:
“Instrumenting the Countryside – Geophysical Monitoring of the Zone of Human Interaction” Continue reading
To read the Twitter Storify summary of this event….
Subsidence as a result of mining in the UK (and abroad) has occurred throughout history. This varies in severity, with evidence of subsidence ranging from topographic depressions to catastrophic surface collapse. In Northwich, and the surrounding areas, the long history of Salt mining and brine pumping has taken its toll. In order to detect / characterise / monitor areas (susceptible) of subsidence, a combination of remote sensing and near-surface geophysics can be applied.
Jamie Pringle and his team at Keele university have conducted much research and monitoring around the Marston Canal over more than 20 years (Pringle, Styles et al. 2012)
“In the village of Marston, the Trent and Mersey Canal crosses several abandoned salt mine workings and previously subsiding areas, the canal being breached by a catastrophic subsidence event in 1953. This canal section is the focus of a long-term monitoring study by conventional geotechnical topographic and microgravity surveys. Results of 20 years of topographic time-lapse surveys indicate specific areas of local subsidence that could not be predicted by available site and mine abandonment plan and shaft data. Subsidence has subsequently necessitated four phases of temporary canal bank remediation. Ten years of microgravity time-lapse data have recorded major deepening negative anomalies in specific sections that correlate with topographic data. Gravity 2D modelling using available site data found upwardly propagating voids, and associated collapse material produced a good match with observed microgravity data. Intrusive investigations have confirmed a void at the major anomaly. The advantages of undertaking such long-term studies for near-surface geophysicists, geotechnical engineers, and researchers working in other application areas are discussed.” (Pringle, Styles et al. 2012)
The fieldwork which was conducted, is a continuation of Jamie’s research.
Fieldwork was conducted 27/7/15 & 28/7/15 along the Marston Canal, in the Survey area indicated in Figure 1.
Figure 1. Location map of survey area: Marston, Northwich.
Monitor and measure relict salt mines using geophysical methods
- Become familiar with measuring micro-gravity geophysical data using a Scintrex CG-5 micro-gravity meter, Leica Pinpoint R100 and Prism and pole.
- Survey data collection area, where gravity points are taken
- Conduct a survey