Publications

 

Ramachandran, K., R. D. Hyndman (2012), The Fate of  Fluids Released From  the Subducting Slab in  Northern Cascadia, Solid Earth, 3, 121–129, 2012 www.solid-earth.net/3/121/2012/ doi:10.5194/se-3-121-2012 .

Ramachandran, K. (2012), Constraining Fault Interpretation Through Tomographic Velocity Gradients: Application To Northern Cascadia, Solid Earth, 3, 53-61, 2012 www.solid-earth.net/3/53/2012/ doi:10.5194/se-3-53-2012.

Ramachandran, K., R. D. Hyndman (2011), The Fate of  Fluids Released From  the Subducting Slab in  Northern Cascadia, Solid Earth Discuss., 3, 943-962, 2011, www.solid-earth-discuss.net/3/943/2011/ doi:10.5194/sed-3-943-2011.

Ramachandran, K. (2011), Constraining Fault Interpretation Through Tomographic Velocity Gradients: Application To Northern Cascadia, Solid Earth Discuss.,  3, 839-856, 2011 www.solid-earth-discuss.net/3/839/2011/ doi:10.5194/sed-3-839-2011.

Ramachandran, K., Bryan Tapp, Tayler Rigsby and Erin Lewallen (2012), Imaging  of  Fault and Fracture Controls in the Arbuckle-Simpson Aquifer, Southern Oklahoma, USA, Through Electrical Resistivity Sounding and Tomography  Methods, International Journal of Geophysics Volume 2012 (2012), Article ID 184836, 10 pages doi:10.1155/2012/184836.

Ramachandran, K., (2012), Regularized Inversion of Controlled Source and Earthquake Data, Journal of Geophysics and Engineering 9 (176) doi:10.1088/1742-2132/9/2/176.

Ramachandran, K., Gilles Bellefleur, Tom Brent, Michael Riedel, Scott Dallimore (2011), Imaging Permafrost Velocity Structure Using High Resolution 3D Seismic Tomography, Geophysics  76, B187 (2011); doi:10.1190/geo2010-0353.1.

G. Bellefleur, M. Riedel, J. Huang, T. Saeki, B. Milkereit, K. Ramachandran, and T. Brent (2010), Seismic Characterization of Gas Hydrate Accumulations in Permafrost Environment: Lessons Learned from Mallik, NWT, Canada, Geological Survey of Canada Bulletin (In Print).

Kumar Ramachandran, Bryan Tapp, Tayler Rigsby, and Erin Lewallen, Characterizing the Arbuckle-Simpson aquifer through electrical methods, SEG Expanded Abstracts 29, 2014 (2010), DOI:10.1190/1.3513240.

Gilles Bellefleur,  Michael Riedel, Kumar Ramachandran, Tom Brent and Scott Dallimore, Recent Advances in Mapping Deep Permafrost and Gas Hydrate Occurrences using Industry Seismic Data, Richards Island Area, Northwest Territories, Canada, Frontiers + Innovation – 2009 CSPG CSEG CWLS Convention, Calgary, Alberta, Canada.

Francisco Cheng, Kumar Ramachandran, and David Contreras, Comparison of petrophysical rock types from core and well-logs using post-stack 3D seismic data: Field example from Maracaibo-Venezuela, SEG Expanded Abstracts 27, 1595 (2008), DOI:10.1190/1.3059215.

K. Ramachandran, Tom Brent, Gilles Bellefleur, Scott Dallimore, and Michael Riedel, Imaging permafrost velocity structure using high resolution 3D seismic tomography , SEG Expanded Abstracts 27, 3300 (2008), DOI:10.1190/1.3064030.

Gilles Bellefleur, Kumar Ramachandran, Michael Riedel, Tom Brent and Scott Dallimore (2008), Recent advances in mapping permafrost and gas hydrate occurrences using industry seismic data from Mallik, Richards Island, Northwest Territories, Canada, The Ninth International Conference on Permafrost (NICOP), Fairbanks, Alaska.

Ramachandran, K., R. D. Hyndman, and T. M. Brocher (2006), Regional P wave velocity structure of the Northern Cascadia Subduction Zone, J. Geophys. Res., 111, B12301, doi:10.1029/2005JB004108.[21 Citations]

Calvert, A. J., K. Ramachandran, H. Kao, and M. A. Fisher (2006), Local thickening of the Cascadia forearc crust and the origin of seismic reflectors in the uppermost mantle, Tectonophysics, Volume 420, Issues 1-2 , 26 June 2006, Pages 175-188.[13 Citations] 

Kao, H., S. Shan, H. Dragert, G. Rogers, J. F. Cassidy, K. Wang, T. S. James, and K. Ramachandran (2006), Spatial-temporal patterns of seismic tremors in northern Cascadia, J. Geophys. Res., 111, B03309, doi:10.1029/2005JB003727.9.[33 Citations]

Ramachandran, K., S. E. Dosso, G. D. Spence, R. D. Hyndman, and T. M. Brocher (2005), Forearc structure beneath southwestern British Columbia: A three-dimensional tomographic velocity model, J. Geophys. Res., 110, B02303, doi:10.1029/2004JB003258.[22 Citations]

Kao, H., S.-Ju. Shan, G. Rogers, H.  Dragert, J. F. Cassidy, and K. Ramachandran  (2005) Depth distribution of seismic tremors along the northern Cascadia margin, Nature, 436, 841-844, doi:10.1038/nature03903.[97 Citations]

Ramachandran, K., S. E. Dosso, C. A. Zelt, G. D. Spence, R. D. Hyndman, and T. M. Brocher (2004), Upper crustal structure of southwestern British Columbia from the 1998 Seismic Hazards Investigation in Puget Sound, J. Geophys. Res., 109, B09303, doi: 10.1029/2003JB002826.[10 Citations]

Hammer, P. T. C., R. M. Clowes, and K. Ramachandran (2004), High-resolution seismic reflection imaging of a thin diamondiferous kimberlite dyke, Geophysics, 69, 1143–1154, 10.1190/1.1801932.[11 Citations]

Hammer, P. T. C., R. M. Clowes, and K. Ramachandran (2004), Seismic reflection imaging of thin kimberlite dykes and sills: exploration and deposit characterization of the snap Lake dyke, Canada, Lithos, 76, 359–367.[02 Citation]

Nedimovic, M. R., R. D. Hyndman, K. Ramachandran, and G. D. Spence (2003), Reflection signature of seismic and aseismic slip on the northern Cascadia subduction interface, Nature, 424, 416–420, doi:10.1038/nature01840.[37 Citations]

Calvert, A. J., M. A. Fisher, K. Ramachandran, and A. M. Tréhu (2003), Possible emplacement of crustal rocks into the forearc mantle of the Cascadia Subduction Zone, Geophys. Res. Lett., 30(23), 2196, doi:10.1029/2003GL018541.[09 Citations]

Brocher, T. M., T. E. Parsons, R. J. Blakely, N. I. Christensen, M. A. R. E. Fisher, Wells, U. S. ten Brink,  T. L. Pratt, R. S. Crosson, K. C. Creager, N. P. Symons, L. A. Preston, Van T. Wagoner, K. C. Miller, C. M. Snelson, A. M. Trehu, V. E. Langenheim, G. D. Spence, K. Ramachandran, R. D. Hyndman, D.  C. Mosher, B. C. Zelt, C. S. Weaver, 2001, Upper crustal structure in Puget Lowland, Washington;  results from the 1998 seismic hazards investigation in Puget Sound, J. Geophys. Res.,  v. 106, pp. 13,541-13,564.[23 Citations]

Manuscripts Under Preparation

Fiona Chen Yao and  Kumar Ramachandran,  Comparison of Petrophysical properties, and Flow Units using 3D Seismic Data: Field Example from Cerro Negro Field, Venezuela,  (Under Submission to Petroleum Geoscience).

Francisco Cheng, Kumar Ramachandran, and David Contreras,  Classification of  petrophysical rock types through core data,  well-logs and post-stack 3D seismic data: Case Study  from Maracaibo-Venezuela, (Under Submission to Petroleum Geoscience).

Ramachandran, K., R. D. Hyndman, and T. M. Brocher (2011), Regional shear  wave velocity structure of the Northern Cascadia Subduction Zone (Under Submission to Journal of Geophysical Research)

PhD  Thesis

Velocity structure of S.W. British Columbia, and N.W. Washington, from 3-D non-linear seismic tomography [15 Citations]

Conference Presentations

Ming Liu and  Kumar Ramachandran, (2011), Evaluation of Jumping and Creeping Regularization Approaches Applied to 3D Seismic Tomography,  American Geophysical Union, Fall meeting, Sanfrancisco.

Kumar Ramachandran, (2011), Interpretation of  3-D Tomographic Velocity Model using Image Processing Algorithms for Mapping Faults: Application to Northern Cascadia American Geophysical Union, Fall meeting, Sanfrancisco.

Kumar Ramachandran, Bryan Tapp, Tayler Rigsby, and Erin Lewallen (2010), Characterizing the Arbuckle-Simpson aquifer through electrical methods, SEG Annual Meeting, Denver, Colorado.

Gilles Bellefleur,  Michael Riedel, Kumar Ramachandran, Tom Brent and Scott Dallimore (2009), Recent Advances in Mapping Deep Permafrost and Gas Hydrate Occurrences using Industry Seismic Data, Richards Island Area, Northwest Territories, Canada, Frontiers + Innovation –  CSPG CSEG CWLS Convention, Calgary, Alberta, Canada.

Kumar Ramachandran, Tom Brent, Gilles Bellefleur, Scott Dallimore, and Michael Riedel (2008), Imaging permafrost velocity structure using high resolution 3D seismic tomography, SEG annual Meeting, Las Vegas, Nevada.

Francisco Cheng, Kumar Ramachandran, and David Contreras (2008), Comparison of petrophysical rock types from core and well-logs using post-stack 3D seismic data: Field example from Maracaibo-Venezuela, SEG Annual Meeting, Las Vegas, Nevada.

Gilles Bellefleur, Kumar Ramachandran, Michael Riedel, Tom Brent and Scott Dallimore (2008), Recent advances in mapping permafrost and gas hydrate occurrences using industry seismic data from Mallik, Richards Island, Northwest Territories, Canada, The Ninth International Conference on Permafrost (NICOP), Fairbanks, Alaska.

K. Ramachandran and R.D. Hyndman (2007), Constraints on The Northern Cascadia Subduction Zone Structure From 3D Shear-wave Tomographic Velocities,  Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract T11B-0573.

Erin K. Lewallen, Kumar Ramachandran, and  Bryan Tapp (2007), Geophysical Investigation of the Arbuckle-Simpson Aquifer, Oklahoma, to Determine the Influence of Subsurface Structure on Groundwater Flow,  Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract NS31B-0381.

R.D. Hyndman and K. Ramachandran (2007), Where Does Subducted Water Go? Estimates from Seismic Tomography of Serpentinite in the Forearc Mantle and Quartz in the Deep Crust, Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract T51B-0548 .

Brocher, T. M., R. J. Blakely, R. A. Wells, B. L. Sherrod, and K. Ramachandran  (2005), The Transition Between N-S and NE-SW Directed Crustal Shortening in the Central and Northern Puget Lowland: New Thoughts on the Southern Whidbey Island Fault, Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract S54A-06 INVITED.

Dash, R., G. Spence, R. Hyndman, M. Riedel, K. Ramachandran, and   T. M.  Brocher (2005), Seismic Velocity Structure of the Strait of Georgia, Southwestern British Columbia from First Arrival Seismic Tomography, Canadian Geophysical Union - Annual   Scientific Meeting,  Banff, Canada.

Ramachandran, K., R. D.  Hyndman, and T. M. Brocher (2004), Structure of the Northern Cascadia Subduction Zone: A 3-D Tomographic P-wave Velocity Model, Eos Trans. AGU, 85(47), Fall Meet. Suppl., Abstract S51B-0167.

Ramachandran, K. and R. M. Clowes, (2003), Structure of the Juan de Fuca Plate and Forearc Mantle below Vancouver Island, Eos Trans. AGU, 84(46), Fall Meet. Suppl., Abstract S42A-0151.

Nedimovic, M. R., R. D.  Hyndman, K. Ramachandran, G. D. Spence,  and T. M. Brocher (2003),  Mapping Great Earthquake Rupture Area, Eos Trans. AGU, 84(46), Fall Meet. Suppl., Abstract S42I-02.

Hammer, P. T. C., R. M. Clowes, and K. Ramachandran (2003), High-resolution Seismic Reflection Imaging of Thin, Diamondiferous Kimberlite Dykes, Eos Trans. AGU, 84(46), Fall Meet. Suppl., Abstract S21C-07.

Ramachandran, K., and R. M. Clowes (2003), Structure of the Cascadia subduction zone below Vancouver Island: Juan De Fuca plate and Forearc mantle, Geological Society of America,   Abstracts with Programs, 35(6), Paper No. 127-8, p. 309.

Nedimovic, M. R., R. D. Hyndman, K. Ramachandran, Spence, G. D., and T. M. Brocher (2003), Reflection signature of seismic and aseismic slip on the northern Cascadia subduction thrust, Geological Society of America, Abstracts with Programs, 35(6), Paper No. 127-6, p. 308.

Calvert, A. J., M. A. Fisher, and K. Ramachandran (2003), Deep reflectors and the possible emplacement of crustal rocks into the forearc mantle of the Cascadia subduction zone, Geological Society of America, Abstracts with Programs, 35(6), Paper No. 127-7, p. 309.

Nedimovic, M. R., K. Ramachandran, and R. D. Hyndman (2002), Deep Structure of the Northern Cascadia Subduction Zone From Reflection, Tomography and Seismicity Studies, Eos Trans. AGU, 83(47), Fall Meet. Suppl., Abstract T51E-05.

Ramachandran, K., and S. E. Dosso (2002), Joint Earthquake/Controlled Source Tomographic Inversion to Image the   Cascadia Subduction Zone, The First International Conference "Inverse Problems: Modeling and Simulation”, Fethiye, Turkey.

Nedimovic, M. R., K. Ramachandran, R. D.  Hyndman, D. Graindorge, and G. D.  Spence (2002), Deep Structure of the Northern Cascadia   Subduction Zone from Multichannel Reflection and Tomography Studies,  Canadian Geophysical Union - Annual   Scientific Meeting,  Banff, Canada.

Ramachandran, K., S. E. Dosso, G. D.  Spence, R. D. Hyndman, T. M. Brocher, and M. M. Fisher (2001), 3-D Velocity Structure of Southwestern British Columbia and Northern Washington, Eos Trans. AGU, 82(47), Fall Meet. Suppl., Abstract S22D-07.

Ramachandran, K., S. E. Dosso, C. A. Zelt, G. D.  Spence, and R. D. Hyndman (2001), 3-D Velocity Structure from Tomographic Inversion of SHIPS Data from Southwestern British Columbia, Seismological Society of America - Annual Meeting.

Ramachandran, K., S. E. Dosso, C. A. Zelt, G. D.  Spence, and R. D. Hyndman (2000), Upper crustal velocity structure of southwestern British Columbia from 3D nonlinear first arrival traveltime tomography, Eos Trans. AGU, 81 (48), Fall Meet. Suppl., Abstract S71D-05.

R. Kumar (1998), Merging aeromagnetic data of adjacent survey blocks in Vindhyan basin, India: A case study, Proceedings of the second conference and exposition on petroleum geophysics, Chennai, India, 1998.

R. Kumar and S. Benjamin (1995), Application of Neural Networks in Geophysics, Proceedings of the 1^st International Petroleum Conference and Exhibition, PETROTECH-95, New Delhi,  India.

R. Kumar  and F. Dotiwala (1995), Imaging of Non Imaged data: An application to Aeromagnetic data of North Eastern India, Proceedings of the 1^st International Petroleum Conference and Exhibition, PETROTECH-95, New Delhi, India.