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Grant George Buffett

Grant George Buffett
Self-employed

Ph.D. in Earth Science

About

22
Publications
3,368
Reads
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359
Citations
Introduction
My main research interest is in seismic oceanography, the application of multi-channel seismic reflection profiling in combination with other physical oceanographic methods to explore circulation and mixing in the ocean.
Additional affiliations
June 2014 - January 2017
Spanish National Research Council
Position
  • PostDoc Position
Description
  • My research interests are: - the tectonic history of the Western Mediterranean. - the nature of the global thermohaline circulation using seismic oceanography.
September 2011 - September 2013
GEOMAR Helmholtz Centre for Ocean Research Kiel
Position
  • Marie Curie Fellow Post Doc
September 2011 - September 2013
GEOMAR Helmholtz Centre for Ocean Research Kiel
Position
  • PostDoc Position
Education
June 2008 - January 2011
University of Barcelona
Field of study
  • Geophysics
June 2006 - June 2008
University of Barcelona
Field of study
  • Geophysics
September 1995 - May 1999
Memorial University of Newfoundland
Field of study
  • Earth Sciences

Publications

Publications (22)
Article
Reprocessing of multi-channel seismic reflection data acquired over the northern margin of the Gulf of Cádiz (SW Iberian margin) places new constraints on the upper crustal structure of the Guadalquivir-Portimão Bank. The data presented have been processed with optimized stacking and interval velocity models, a better approach to multiple attenuati...
Article
Full-text available
We use seismic oceanography to document and analyze oceanic thermohaline finestructure across the Tyrrhenian Sea. Multichannel seismic (MCS) reflection data were acquired during the MEDiterranean OCcidental survey in April-May 2010. We deployed along-track expendable bathythermograph probes simultaneous with MCS acquisition. At nearby locations we...
Article
We investigate the lithospheric structure of the Iberian Peninsula and lateral crustal density variations using a three-step approach. First the crustal and mantle lithosphere thicknesses are calculated from joint geoid and elevation modelling combined with thermal analysis further constrained by seismic data. We then compute the 3D gravity effect...
Article
Full-text available
We apply Stochastic Heterogeneity Mapping based on the band-limited von Kármán power law function to stacked migrated seismic data of thermohaline staircases in the Tyrrhenian Sea. This process allows the estimation of stochastic parameters such as the Hurst number (a measure of surface roughness) and scale length. Thermohaline staircases are regul...
Conference Paper
Full-text available
Processed multi-channel seismic data acquired in the Tyrrhenian Sea in April-May 2010 provide images of oceanic thermohaline staircases. Thermohaline staircases are regular, well-defined step-like variations in vertical profiles of temperature and salinity. In the ocean they are thought to be the result of double diffusion driven by the two order of...
Article
The Whitehorse trough is an Early to Middle Jurassic underexplored and undrilled sedimentary basin in the northern Canadian Cordillera that is prospective for oil and gas. It records deposition in a collapsing forearc that evolved to become a synorogenic piggyback basin within the nascent Cordilleran orogen. The basin developed atop the Triassic an...
Article
Seismic oceanography is based on the passage of a regularly repeating acoustic impulsive source and an acquisition streamer along the surface of the ocean, and on summing together all signals reflected from temperature and salinity interfaces in the ocean (where there are acoustic impedance contrasts). Due to the inherent redundancy of the method,...
Article
Multichannel seismic data acquired in the Gulf of Cadiz in April-May 2007 provided images of an oceanic thermohaline staircase. Thermohaline staircases are regular, well-defined step-like variations in vertical profiles of temperature and salinity. In the ocean they are the result of double diffusion driven by the difference in the molecular diffus...
Article
Full-text available
L’oceanografia sísmica s’està convertint en una eina pràctica per estudiar la circulació oceànica a gran escala, els processos de mescla a mesoescala i la seva dinàmica. A més, s’ha demostrat la seva utilitat per quantificar paràmetres com ara la temperatura i la salinitat. Des de 2003, s’ha emprès la recerca en la millora i l’adaptació de la sísmi...
Article
Full-text available
Analysis of the abundance of existing and to be acquired seismic reflection data for stratification within the ocean itself (known as seismic oceanography) gives a new perspective on how we can develop models of ocean circulation and therefore climate. Since 2003 seismic oceanography has begun in earnest with many international groups analyzing...
Thesis
Full-text available
Large scale global ocean1 circulation redistributes heat and freshwater and therefore affects global climate. One of its main forcing mechanisms is, in addition to surface heat and freshwater fluxes, the diapycnal (across lines of equal density) mixing in the ocean interior. The energy needed to drive the mixing processes is mainly provided by tide...
Article
Full-text available
We present the first application of Stochastic Heterogeneity Mapping based on the band-limited von Kármán function to a seismic reflection stack of a Mediterranean water eddy (meddy), a large salt lens of Mediterranean water. This process extracts two stochastic parameters directly from the reflectivity field of the seismic data: the Hurst number,...
Article
Full-text available
We present the first application of Stochastic Heterogeneity Mapping based on the band-limited von Kármán function to a seismic reflection stack of a Mediterranean water eddy (meddy), a large salt lens of Mediterranean water. This process extracts two stochastic parameters directly from the reflectivity field of the seismic data: the Hurst number,...
Article
Full-text available
We present the first application of stochastic heterogeneity mapping based on the band-limited von Kármán function to a seismic reflection stack of a Mediterranean water eddy (meddy), a large salt lens of Mediterranean water. This process extracts two stochastic parameters directly from the reflectivity field of the seismic data: the Hurst number,...
Article
Full-text available
Marine seismic data display laterally coherent reflectivity from the water column that is attributed to fine-scale oceanic layering. The amplitude of the different reflections is the expression of acoustic impedance contrasts between neighbouring water masses, and therefore water reflectivity maps the ocean's vertical sound speed and density (i.e.,...
Article
Seismic reflection profiling is applied to the study of large scale physical oceanographic processes in the Gulf of Cádiz and western Iberian coast, coinciding with the path of the Mediterranean Undercurrent. The multi-channel seismic reflection method provides clear images of thermohaline fine structure with a horizontal resolution approximately t...
Article
Stochastic heterogeneity mapping based on the band-limited Von Karman function is applied to stacked, migrated seismic data allowing the extraction of several stochastic parameters that may elucidate ocean mixing processes. In particular, the Von Karman method enables extraction from the reflectivity field: 1) the power spectrum, a combined estimat...
Article
Full-text available
This work illustrates the great potential of multichannel seismic reflection data to extract information from the finestructure of meddies with exceptional lateral resolution (10-15 m). We present seismic images of three meddies acquired in the Gulf of Cadiz (SW Iberian Peninsula), which consist of concentric reflectors forming oval shapes that sha...
Article
Full-text available
The Whitehorse Trough is a Mesozoic sedimentary basin in south-central Yukon Territory that has been identified as an immature, gas-prone basin, based on a limited geoscience database. One hundred and seventy kilometres of regional, multi-channel, multi-component Vibroseis seismic-reflection data were acquired in 2004 across the northern Whitehorse...
Article
Full-text available
The Whitehorse Trough is a Mesozoic sedimentary basin in south-central Yukon that has been identified as an immature, gas-prone basin, based on a limited geoscience database. A total of 170 km of regional, multi-channel, multi-component Vibroseis seismic reflection data were acquired in 2004 across the northern Whitehorse Trough in order to improve...

Projects

Projects (4)
Project
The aim of seismic oceanography is retrieving information on the thermohaline finestructure of the ocean as well as on the dynamic processes occurring at the submesoscale using remote acoustic "multichannel seismic" systems. The unprecedented lateral resolution of the system covering from km to tens of meters to full ocean depth is ne of its main strengths. An ancillary objective is to design a low-impact, portable system specifically designed for physical oceanopgraphy
Archived project