Now showing items 1-11 of 11

    • Electrical lithosphere beneath the Kaapvaal craton, southern Africa 

      Evans, Rob L.; Jones, Alan G.; Garcia, Xavier; Muller, Mark R.; Hamilton, Mark P.; Evans, Shane; Fourie, C. J. S.; Spratt, Jessica; Webb, Susan J.; Jelsma, Hielke; Hutchins, David (American Geophysical Union, 2011-04-20)
      A regional-scale magnetotelluric (MT) experiment across the southern African Kaapvaal craton and surrounding terranes, called the Southern African Magnetotelluric Experiment (SAMTEX), has revealed complex structure in the ...
    • Electrical structure beneath the northern MELT line on the East Pacific Rise at 15°45′S 

      Baba, Kiyoshi; Tarits, Pascal; Chave, Alan D.; Evans, Rob L.; Hirth, Greg; Mackie, Randall L. (American Geophysical Union, 2006-11-16)
      The electrical structure of the upper mantle beneath the East Pacific Rise (EPR) at 15°45′S is imaged by inverting seafloor magnetotelluric data obtained during the Mantle ELectromagnetic and Tomography (MELT) experiment. ...
    • The electrical structure of the central Pacific upper mantle constrained by the NoMelt experiment 

      Sarafian, Emily; Evans, Rob L.; Collins, John A.; Elsenbeck, James R.; Gaetani, Glenn A.; Gaherty, James B.; Hirth, Greg; Lizarralde, Daniel (John Wiley & Sons, 2015-04-18)
      The NoMelt experiment imaged the mantle beneath 70 Ma Pacific seafloor with the aim of understanding the transition from the lithosphere to the underlying convecting asthenosphere. Seafloor magnetotelluric data from four ...
    • Lithospheric structures and Precambrian terrane boundaries in northeastern Botswana revealed through magnetotelluric profiling as part of the Southern African Magnetotelluric Experiment 

      Miensopust, Marion P.; Jones, Alan G.; Muller, Mark R.; Garcia, Xavier; Evans, Rob L. (American Geophysical Union, 2011-02-03)
      Within the framework of the Southern African Magnetotelluric Experiment a focused study was undertaken to gain improved knowledge of the lithospheric geometries and structures of the westerly extension of the Zimbabwe ...
    • Magnetotelluric data, stable distributions and impropriety: an existential combination 

      Chave, Alan D. (Oxford University Press, 2014-05-30)
      The robust statistical model of a Gaussian core contaminated by outlying data that underlies robust estimation of the magnetotelluric (MT) response function has been re-examined. The residuals from robust estimators are ...
    • On the statistics of magnetotelluric rotational invariants 

      Chave, Alan D. (Oxford University Press on behalf of The Royal Astronomical Society, 2013-10-25)
      The statistical properties of the Swift skew, the phase-sensitive skew and the WAL invariants I1−I7 and Q are examined through analytic derivation of their probability density functions and/or simulation based on a Gaussian ...
    • Prediction of silicate melt viscosity from electrical conductivity : a model and its geophysical implications 

      Pommier, Anne; Evans, Rob L.; Key, Kerry; Tyburczy, James A.; Mackwell, Stephen; Elsenbeck, James R. (John Wiley & Sons, 2013-06-12)
      Our knowledge of magma dynamics would be improved if geophysical data could be used to infer rheological constraints in melt-bearing zones. Geophysical images of the Earth's interior provide frozen snapshots of a dynamical ...
    • Robust magnetotelluric inversion 

      Matsuno, Tetsuo; Chave, Alan D.; Jones, Alan G.; Muller, Mark R.; Evans, Rob L. (Oxford University Press on behalf of The Royal Astronomical Society, 2014-01-02)
      A robust magnetotelluric (MT) inversion algorithm has been developed on the basis of quantile-quantile (q-q) plotting with confidence band and statistical modelling of inversion residuals for the MT response function ...
    • Segmentation of plate coupling, fate of subduction fluids, and modes of arc magmatism in Cascadia, inferred from magnetotelluric resistivity 

      Wannamaker, Philip E.; Evans, Rob L.; Bedrosian, Paul A.; Unsworth, Martyn J.; Maris, Virginie; McGary, R Shane (John Wiley & Sons, 2014-11-11)
      Five magnetotelluric (MT) profiles have been acquired across the Cascadia subduction system and transformed using 2-D and 3-D nonlinear inversion to yield electrical resistivity cross sections to depths of ∼200 km. Distinct ...
    • The statistical distribution of magnetotelluric apparent resistivity and phase 

      Chave, Alan D.; Lezaeta, Pamela F. (John Wiley & Sons, 2007-07-29)
      The marginal distributions for the magnetotelluric (MT) magnitude squared response function (and hence apparent resistivity) and phase are derived from the bivariate complex normal distribution that describes the distribution ...
    • Structure of the mantle beneath the Alboran Basin from magnetotelluric soundings 

      Garcia, Xavier; Seille, H.; Elsenbeck, James R.; Evans, Rob L.; Jegen, Marion; Holz, Sebastian; Ledo, Juanjo; Lovatini, Andrea; Marti, Anna; Marcuello, Alejandro; Queralt, Pilar; Ungarelli, Carlo; Ranero, Cesar R. (John Wiley & Sons, 2015-12-19)
      We present results of marine MT acquisition in the Alboran sea that also incorporates previously acquired land MT from southern Spain into our analysis. The marine data show complex MT response functions with strong ...