Browsing by Author "Mahale, V."
Now showing items 1-19 of 19
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Acoustic characterization of seafloor habitats on the western continental shelf of India
Chakraborty, B.; Mahale, V.; Navelkar, G.S.; Rao, B.R.; Desai, R.G.P.; Ingole, B.S.; Janakiraman, G. (Oxford University Press, 2007)This is a study of the interaction effects of the dual frequency (210 and 33 kHz) backscatter signal with seafloor sediment and benthic biota along a transect in water 27–83 m deep offshore of the Goa region of India’s ... -
Bathymetry and sediments on the carbonate platform off western India: Significance of Halimeda bioherms in carbonate sedimentation
Rao, V.P.; Mahale, V.; Chakraborty, B. (Springer India, 2018)Bathymetry across the carbonate platform off western India indicated small-size pinnacles and their lateral coalescence into 2 -6-m high mounds landward, and linear elongated carbonate ridges and troughs, mounds and banks ... -
Biodiversity assessment using passive acoustic recordings from off-reef location�Unsupervised learning to classify fish vocalization
Mahale, V.; Chanda, K.; Chakraborty, B.; Salkar, T.; Sreekanth, G.B. (Acoustical Society of America (ASA), 2023)We present the quantitative characterization of Grande Island�s off-reef acoustic environment within the Zuari estuary during the pre-monsoon period. Passive acoustic recordings reveal prominent fish choruses. Detailed ... -
Buried channels provide keys to infer Quaternary stratigraphic and paleo-environmental changes: A case study from the west coast of India
Dubey, K.M.; Chaubey, A.K.; Mahale, V.; Karisiddaiah, S.M. (2019)High resolution shallow seismic data was acquired from inner continental shelf of Goa, west coast of India to map underlying stratigraphic and buried geomorphic features of shelf strata. Seismic data revealed characteristic ... -
Characterizing three shallow-water locations off Goa, India, using passive acoustic data
Chanda, K.; Chakraborty, B.; Mahale, V.; Latha, G.; Fernandes, W.A. (Acoustical Society of America (ASA), 2020)In this study, an analysis of the passive acoustic data is carried out for the quantitative characterization of shallow-water acoustic environments from three major estuarine systems of Goa during the months of March and ... -
Conjugate nature of the Alleppey-Trivandrum Terrace Complex with the Northern Madagascar Ridge in the early opening model of the Arabian Sea: evaluation based on an integrated geophysical investigation
Bijesh, C.M.; Yatheesh, V.; Kurian, P.J.; Savio, J.J.; Mahale, V.; Shet, Abhishek; Gautham, S. (Springer, 2022)The southwestern continental margin of India reveals the presence of an anomalous bathymetric high feature located in the mid-continental slope region off Trivandrum. Based on the analysis of the available geophysical data ... -
Echo-waveform classification using model and model free techniques: Experimental study results from central western continental shelf of India
Chakraborty, B.; Navelkar, G.S.; Desai, R.G.P.; Janakiraman, G.; Mahale, V.; Fernandes, W.A.; Rao, N. (Marine Technology Society, 2005)Seafloor classifications and characterization using acoustic backscatter data from the central western continental shelf of India is presented in this work. Single beam sea-floor echo data using two frequencies: 33 kHz and ... -
Evidence for underwater current activity on the upper slope of the carbonate platform off western India using multibeam bathymetry
Chakraborty, B.; Rao, V.P.; Salkar, T.; Mahale, V.; Kurien, J. (Current Science Association & Indian Academy of Sciences, 2019)This note presents multi-beam bathymetry data from the carbonate platform on the outer continental shelf of the northwestern margin of India at water depths between 60 and 90 m. This study analyze effect of underwater ... -
Fine-scale analysis of shelf -slope physiography across the western continental margin of India
Chakraborty, B.; Mukhopadhyay, R.; Jauhari, P.; Mahale, V.; Shashikumar, K.; Rajesh, M. (Springer-Verlag, 2006)We attempt here to quantify and model physiographic phenomena off the central west coast of India in terms of power spectral exponent, amplitude parameter. The statistical analysis of the multibeam echosounder grid bathymetry ... -
Gas migration signatures over the volcanic cratered seamount, off the Nicobar Islands in the Andaman Sea
Sriram, G.; Dewangan, P.; Yatheesh, V.; Peketi, A.; Mahesh, P.; Mazumdar, A.; Mahale, V.; Jacob, J.; Dubey, K.M.; Kumar, Pankaj; Mishra, C.K.; Gautham, S.; Anirudh, A.K.; Ankush, P.; MadhavRam, A.B.; Shijin, K.K.; Salkar, T.G.; Zatale, Anjali; Rajurkar, V.; Khokher, S.H.; Garg, Shriya; Choudhary, A.K.; Aswini, K.K.; Gawas, Amol (Springer, 2023)The submarine volcanic arc off-Nicobar is seismologically very active with numerous earthquake swarms reported after the tsunamigenic 26th December 2004 earthquake in the Andaman-Nicobar-Sumatra subduction zone. Therefore, ... -
Hydrography and water masses in the southeastern Arabian Sea during March-June 2003
Shenoi, S.S.C.; Shankar, D.; Michael, G.S.; Kurian, J.; Varma, K.K.; RameshKumar, M.R.; Almeida, A.M.; Unnikrishnan, A.S.; Fernandes, W.A.; Barreto, N; Gnanaseelan, C.; Mathew, R.; Praju, K.V.; Mahale, V. (Indian Academy of Sciences, 2005)This paper describes the hydrographic observations in the southeastern Arabian Sea (SEAS) during two cruises carried out in March–June 2003 as part of the Arabian Sea Monsoon Experiment. The surface hydrography during ... -
Hydrothermal amorphous silica, barite and orpiment from the crater area of seamount (SM-13) off Nicobar island, Andaman sea: Indications for the development of a new hydrothermal field
Peketi, A.; Sriram, G.; Mazumdar, A.; Dewangan, P.; Zatale, Anjali; Rajurkar, V.; Shirodkar, G.; Mahale, V.; Yatheesh, V. (Elsevier, 2024)The Andaman sea characterized by trench-arc-backarc elements (Andaman-Nicobar island-arc, the Andaman back-arc spreading center, the seamount complex, and the back-arc basin) is a complex active basin and is known for ... -
New sites of Australasian microtektites in the central Indian Ocean: Implications for the location and size of source crater
ShyamPrasad, M.; Mahale, V.; Kodagali, V.N. (AGU, 2007)Fifteen new Australasian microtektite sites have been identified along a transect roughly N-S in the central Indian Ocean. These locations, in addition to the existing 46 sites, total to 61 microtektite sites in the oceans. ... -
Quantitative characteristics of the Indian Ocean seafloor relief using fractal dimension
Chakraborty, B.; Mahale, V.; Shashikumar, K.; Srinivas, K. (NISCAIR, CSIR, 2007)In this paper spectral technique has been applied for seafioor topographic data analyses from three seafioor provinces of the Indian Ocean. Study sites include West of the Andaman Island (WAT), Western Continental Margins ... -
Seafloor backscatter signal simulation and classification
Mahale, V.; El Dine, W.G.; Chakraborty, B. (Allied, India, 2005)In this paper, simulation study is initiated to observe the interaction effect of the sound signal with different seafloors types and its classification. Simulation of the echo envelope signal is done by accurately formulating ... -
Seafloor classification using acoustic backscatter echo-waveform - Artificial neural network applications
Chakraborty, B.; Mahale, V.; Navelkar, G.S.; Desai, R.G.P. (IEEE Singapore Section Secretariat, 2006)In this paper seafloor classifications system based on artificial neural network (ANN) has been designed. The ANN architecture employed here is a combination of Self Organizing Feature Map (SOFM) and Linear Vector Quantization ... -
Seafloor classification using echo- waveforms: A method employing hybrid neural network architecture
Chakraborty, B.; Mahale, V.; DeSouza, C.; Das, P. (IEEE, 2004)This letter presents seafloor classification study results of a hybrid artificial neural network architecture known as learning vector quantization. Single beam echo-sounding backscatter waveform data from three different ... -
Tectonic appraisal of the Mid-Thane Creek of Mumbai, India: An integrated geophysical approach
Jacob, J.; Pitchika, V.K.; Dubey, K.M.; Mishra, Akhil; Kumar, Pankaj; Kumar, Shravan; Mahale, V.; Chaubey, A.K. (Springer, 2020)Integrated geophysical surveys, comprising marine magnetic, high resolution shallow seismic and single-beam bathymetry were conducted to assess subsurface tectonics of the Mid-Thane Creek (MTC) of Mumbai. The bathymetry ... -
Widespread occurrence of methane seeps in deep-water regions of Krishna-Godavari basin, Bay of Bengal
Dewangan, P.; Sriram, G.; Aditya, Kumar; Mazumdar, A.; Peketi, A.; Mahale, V.; Reddy, S.S.C.; Babu, A. (Elsevier Ltd, 2021)Drilling/coring activities during NGHP-Expeditions 01 and 02 discovered significant gas hydrate deposits in the Krishna-Godavari (KG) basin, a proven petroliferous basin located along the eastern continental margin of ...