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Chandra, Subash
- Multichannel Analysis of Surface Waves and High-Resolution Electrical Resistivity Tomography in Detection of Subsurface Features in Northwest Himalaya
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Authors
Affiliations
1 School of Earth and Environmental Sciences, Central University of Himachal, Dharamshala 176 207, IN
2 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
3 Ministry of Earth Sciences, Government of India, New Delhi 110 003, IN
1 School of Earth and Environmental Sciences, Central University of Himachal, Dharamshala 176 207, IN
2 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
3 Ministry of Earth Sciences, Government of India, New Delhi 110 003, IN
Source
Current Science, Vol 108, No 12 (2015), Pagination: 2230-2239Abstract
Geophysical studies using multichannel analysis of surface waves (MASW) and high-resolution electrical resistivity tomography (HERT) have been jointly carried out on an experimental basis in the field. The motive is to study shallow subsurface features (i.e. faults traces, cavities and palaeo-channels) in the foothill zone of Northwest Himalaya. These techniques have shown their potentiality in successfully identifying shallow (0-24 m) fault traces and dissolution features/palaeo-channels. Depending on the sensitivity of the MASW and HERT techniques, geophysical signatures of the subsurface features were recorded and further resolved with the help of synthetic simulation. The synthetic simulation of 2D electrical response has been carried out over the initial model for subsurface fault traces as well as palaeo-channels. The initial model has been refined iteratively to bring the synthetic response close to the field response and hence the final refined model is considered to be the true representation of the subsurface.Keywords
Fault Traces, High-Resolution Electrical Resistivity Tomography, Multichannel Analysis of Surface Waves, Synthetic Simulation, Palaeo-Seismology.Full Text
- Societal Application of Geophysics as an Aid to a Rescue Operation at Jaipur
Abstract Views :191 |
PDF Views:0
Authors
Affiliations
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad - 500 606, IN
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad - 500 606, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 2 (2012), Pagination: 155-160Abstract
Geophysical techniques are normally employed to explore the subsurface and determine the anomalies but they are always much larger in dimension. However, a very precise measurement was needed to pin point a misaligned horizontal tunnel made at 47 m depth to intercept an old bore well and rescue a four year child fallen accidently on 9th November at Jagatpura village in Jaipur, India. Due to the greater depth and presence of iron casing, electric power, etc., no equipment could work to determine the orientation of the tunnel that has lost its direction. The dimension of the site and many other constrains didn't allow conventional geophysical methods to be used. An innovative method was then designed and successfully applied, which determined 1.92 m deviation of the tunnel end point to the east from the old bore well. The digging was redirected accordingly and the bore well was intercepted. This paper describes the theoretical background, forward simulations and the field experiment of the newly designed geophysical method.Keywords
Tunnel Alignment, Bore Well, Societal Application, Geophysics, Buried Bipole Pole (BBP) Method.
References
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