Showing papers in "Tectonophysics in 1974"

TL;DR: In this article, the geometrical consequences of displacements along strike-slip faults with respect to the associated deformation, terminal and otherwise, are discussed in detail, based on model experiments and by field examples.

TL;DR: In this article, a series of experiments are described, which illustrate the effects of temperature, strain rate and the presence of pore water on the rheological behaviour of Carrara Marble and Solnhofen Limestone.

TL;DR: In this article, a study of the frictional behavior of seven low-porosity silicate rocks was made at temperatures to 700°C and pressures from 2.5 to 6 kbar.

TL;DR: In this article, a simple shear model is proposed for mobile belts characterised by L-S tectonite fabrics in which the planar element dips at a low angle away from the foreland and the linear (stretching) element is transverse to the boundary of the belt.

TL;DR: More than fifty igneous provinces are recognized as discussed by the authors, each province consists of similar volumes of volcanic material and crustal intrusives, the volcanism generally lasting less than 5 m.y.

TL;DR: In this article, a fundamental understanding of the relation between stress concentrations at grain contacts and microfractures in granular aggregates is obtained through two-dimensional photomechanical model studies and is tested through observational studies of experimentally deformed sandstone discs, glass beads, and quartz sand.

TL;DR: In this article, the relationship between the initial orientation and grain susceptibilities is discussed quantitatively, for three different strain response models which can be expressed mathematically, demonstrate the characteristic features of the progressive development of the magnetic fabric and emphasize the importance of a knowledge of the strain response model, if measurements of magnetic anisotropy are to be used to measure finite strain.

TL;DR: Using the table of ultimate strain presented by Rikitake (1974), a Weibull model representing a statistical distribution of crustal-rupture occurrence time is determined on the assumption that the crust is strained with a constant speed as mentioned in this paper.

TL;DR: In this paper, the National Geodetic Survey has been creating a data base of vertical crustal movement information, which are relative elevation changes along lines of releveling which are used to produce graphic displays on microfilm.

TL;DR: In this article, the authors reviewed the explanations of the formation of radial dykes, ring dykes and cone sheets and found that they were unsatisfactory and suggested that the cone sheets occupied shear fractures formed as the result of dynamic stresses arising from the rapid expansion of a magma undergoing retrograde boiling.

TL;DR: In this paper, a model was developed to account for the structures observed from a consideration of the relative viscosities of the country rocks and the intrusive magmas and expected stress/strain rate relationships.

TL;DR: In this article, the uplift movements of the New Caledonia and the Loyalty Islands, which are located on the Indian lithospheric plate that descends beneath the New Hebrides arc, have been studied in the geological context.

TL;DR: Palaeomagnetic data from the Phanerozoic of Australia are summarized and critically reviewed in this paper, showing that during the Early Palaeozoic the pole paths for northern and central Australia are similar confirming the regions were a single unit during that time.

TL;DR: In this article, a series of experiments were carried out on card decks and foliated rock in order to study the nucleation and growth of kinks, and the results showed that most kinks initiated as symmetric or monoclinal buckles which rapidly changed to an angular, stable form similar to that observed in nature.

TL;DR: An integrated interpretation of the seismic refraction, seismic reflection, and gravity data obtained by the Australian Bureau of Mineral Resources, Geology and Geophysics to the end of 1971 has been made to determine the nature and structure of the crust and upper mantle in the southern part of the West Australian Shield as mentioned in this paper.

TL;DR: Norwegian heat flow measurements in drill holes and lakes give a mean of 1.02 ± 0.21 heat-flow units (48 values) and a zone of possible low mantle heat flow is present east of the Caledonian mountains in Norway.

TL;DR: In this article, a new method for finite strain analysis of naturally deformed sub-fabrics of elliptical markers is proposed, assuming an homogeneous deformation on the scale of the sample.

TL;DR: In this paper, the Coulomb criterion was re-examined based on the observed microfracturing before faulting in rocks and a physical model for the internal friction and the cohesive stress of Coulomb was proposed.

TL;DR: In this paper, the authors used a Gaussian distribution to estimate the probability of having a crustal rupture or an earthquake occurrence during a time-interval from 0 to t, along with the data for strain accumulation over the area concerned as brought out by repetitions of geodetic survey.

TL;DR: In this article, the development of axial offsets and transverse tectonic structures both in the Afar Rift and in the early stages of the Atlantic Rift can be explained by essentially the same model.

TL;DR: In this article, the late Tertiary and Quaternary volcanism of southeastern Spain can be fitted in a platetectonics model, taking into account the post-Paleozoic evolution of the stable and semimobile Iberian areas and the new orogenic belts bordering the Mediterranean between Africa and the Iberians.

TL;DR: In this paper, seven focal-mechanism solutions are obtained for earthquakes in the Kashmir, Tibet and Nepal regions of the Himalaya from P-wave first-motion directions.

TL;DR: In this article, the behavior of a group of rigid particles embedded in a viscous material which is strained by pure shear and simple shear is investigated by considering the behaviour of each of the individual particles in the system.

TL;DR: A detailed examination of a Gondwanaland re-assembly of Peninsular India and part of East Antarctica was carried out in this paper, where several conclusions were drawn largely from data from the Indian coastal belt, which includes Ceylon.

TL;DR: In this article, the authors discuss the evolution of the surface expression of some transform faults with the help of a few geological examples and a simple experimental clay model in which the importance of en-echelon fault systems is assessed.

TL;DR: In this article, a model of a dilating magma chamber in an elastic half-space is proposed to explain the rapid deformations of Kilauea Volcano, Hawaii, in the absence of an observable piezomagnetic effect.

TL;DR: In this paper, the existence of active or inactive periods in the world's chief seismic belts, which is one of the fundamental problems in space-time seismicity, is discussed based on spacetime diagrams of world's large shallow earthquakes in the past seventy years period.

TL;DR: In this paper, a series of finite-element analyses were performed to determine the mechanical disequilibria in the form of heterogeneous stress distribution for the two-dimensional, large-amplitude folding of competent layers in a less competent matrix.