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GeologyScience Repository: Recent submissions
Now showing items 120 of 34556

(2004)Emplacement of the southern Urals accretionary complex onto the East European Craton involved offscraping of shallow marine limestones from the continental margin and their underplating to the base of the accretionary ...

(2004)Structural geology textbooks distinguish among four end members of threedimensional refold structures established from their twodimensional interference patterns. Here it is shown that six different end members of ...

(2004)Quantitative P T path determination in metamorphic rocks is commonly based on the variation in composition of growthzoned garnet. However, some component of growth zoning in garnet is necessarily the result of an effective ...

(2004)This paper presents a comparison of raytheoretical and finitefrequency traveltime tomography for compressional waves. Our data set consists of 86 405 longperiod P and PPP traveltimes measured by crosscorrelation. The ...

(2004)Modifications to commercial finite element (FE) packages must be applied before they can be used for geophysical studies involving long wavelength deformation or viscoelasticity. This paper provides in detail how and why ...

(2004)Numerical studies of the geodynamo have taken different views on the importance of inertial effects. Some have neglected inertia, while others have boosted its strength, in much the same way as they have had to take an ...

(2004)We present a new method for data weighting in waveform inversion to improve the obtained seismological earth model. We define 'sensitivity' as an index to show the homogeneity of the waveform inversion data set. The ...

(2004)Core motion induced by lunisolar precession of the mantle is analysed and compared with experiments and Earth observations. Firstorder motion has the core axis lagging the mantle axis in precession by a small angle. This ...

(2004)Models of development of lattice preferred orientation (LPO) of crystals aggregates in convective flow are necessary to interpret the anisotropic seismic signature of the Earth's upper mantle. For that purpose we previously ...

(2004)A simple analysis suggests that a time interval of more than about 5000 Myr is needed for the random palaeogeographic test to be effective in assessing the geomagnetic axial dipole assumption. This time is so long as to ...

(2004)The dustywing fauna (Neuroptera: Coniopterygidae) of Upper Albian Burmese amber is revised. Two species are recognised, one belonging to the subfamily Aleuropteryginae and one to the Coniopteryginae. The aleuropterygine ...

(2004)The oldest pisaurid spider Palaeohygropoda myanmarensis gen. et sp. nov. (Araneae: Pisauridae) is described from 100107 Mya (Albian) Cretaceous amber (Burmite) from Myanmar (Burma). This specimen extends the known range ...

(2004)Groundwater flow in an unconfined aquifer (a porous layer with an open top) can be driven either by hydraulic forces, i.e. the gradient of the water table, or by differences in the density of porewater due to thermal ...

(2004)In the analysis of petroleum reservoirs, one of the most challenging problems is to use inverse theory in the search for an optimal parameterization of the reservoir. Generally, scientists approach this problem by computing ...

(2004)To carry out an efficient and effective exploitation of a slate mine, it is necessary to have detailed information about the production potential of the site. To assist us in estimating the quality of slate from a small ...

(2004)We calculate three dimensional (3D) sensitivity kernels for fundamentalmode surface wave observables based on the singlescattering (Born) approximation. The sensitivity kernels for measured phases, amplitudes and arrival ...

(2004)This paper deals with the spectral element modelling of seismic wave propagation on a global scale. Two aspects relevant to lowfrequency studies are particularly emphasized. First, the method is generalized beyond the ...

(2004)The aim of this work is to calibrate a magnetic susceptibility field probe (SM30) in order to allow measurement on natural boulders of any shape and size. This calibration was performed through measurements on pebbles of ...

(2004)Grid representation of 3D media and linear interpolation functions have been widely used in recent seismic traveltime tomographic studies. Either velocity or slowness is used as a model parameter in such studies, which ...

(2004)Determination of the transfer function is the main objective in magnetotelluric (MT) and geomagnetic data processing. In this paper we describe a new algorithm for finding a transfer function through determination of the ...
Now showing items 120 of 34556