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Mahajan, A. K.
- Multichannel Analysis of Surface Waves and High-Resolution Electrical Resistivity Tomography in Detection of Subsurface Features in Northwest Himalaya
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PDF Views:97
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
- Applications of Two-Dimensional Seismic Tomography for Subsurface Cavity and Dissolution Features Detection Under Doon Valley, NW Himalaya
Abstract Views :260 |
PDF Views:96
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, 33, GMS Road, Dehradun - 248001, IN
1 Wadia Institute of Himalayan Geology, 33, GMS Road, Dehradun - 248001, IN
Source
Current Science, Vol 115, No 5 (2018), Pagination: 962-969Abstract
The presence of natural voids, cavities and palaeochannels under the surface hinders the extension of urbanization particularly in the new upcoming cities in the frontal part of the Himalaya. The Doon valley is characterized by such features. In this context, multichannel analysis of surface waves technique is used as a cost-effective solutions for investigating subsurface cavities, voids, shallow weathered zones and dissolution features in the Doon valley, NW Himalaya. Given the sensitivity of the deduced shear wave velocity to lithology, clast composition, degree of saturation, velocity distribution to a target depth of 40–50 m is a useful guide to demarcate different erosional/ dissolution features, cavities and palaeo-channels. 2D shear wave velocity data sets have been acquired along several profiles in the upcoming region of the Doon valley. Data processing has been carried out at 50 sites and shear wave velocity and profiles were validated taking into account field observations and bore hole data. The subsurface karst features or palaeo-channels are always a matter of concern to engineers before any development starts, because these features could cause subsidence in the region. Anomalies, that include caverns, dissolution features, and erosional channels etched into the Dehradun Fan sediments at shallow depth, have effectively been identified in the 2D shear wave velocity (Vs) field from >50 sites. The subsurface architecture further suggests variation in tectono-climatic condition and shifting of provenance during the fan building processes.Keywords
Caverns and Palaeo-Channels, Dehradun Fan, Dissolution Features, Multichannel Analysis of Surface Waves, Sub-Surface Investigations.Full Text
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