TL;DR: In this article, mathematical expressions are derived which relate the final elliptical ratio and orientation of particles to their initial form and the magnitude and orientations of the finite rotational or irrotational strain.

TL;DR: The results of a paleomagnetic investigation on igneous and sedimentary rocks from Portugal and Spain are presented in this paper, which indicates that the Iberian Peninsula has rotated relative to that part of Europe north of the Alpine fold belts.

TL;DR: In this paper, the authors present new results of absolute rock-stress measurements performed in the upper part of the earth's crust as a contribution to the discussions of the problem of 1) whether the earth is expanding or contracting and 2) whether continental drift and convection currents exist.

TL;DR: A subdivision of the orogenic peridotites into ophiolitic (or truly Alpine-type) and root-zone peridotsites is proposed in this paper, and their differences in tectonic setting and metamorphic facies are discussed.

TL;DR: In this article, the shape of the mid-Oceanic ridge may represent a minimum-work configuration for a particular spreading rate and direction, and when these quantities change the ridge shape adjusts itself to a new configuration if the energy barrier is not too great.

TL;DR: In this article, the position of the seismic zone may be correlated with the chemistry of the rocks and in the New Guinea Arc the plane dips towards the continent, in the Solomon Island Arc (Bougainville section), in the southern section (New Georgia-Guadalcanal) it is almost vertical.

TL;DR: In this paper, an undulation in the conducting layer of the mantle was found to be correlated with a high-temperature isotherm, perhaps 1,200°C.

TL;DR: In this paper, a numerical study of the finite-amplitude folding of a thin, free, viscous-plastic layer brings to light two distinct types of instability.

TL;DR: Fault plane solutions of 89 shallow earthquakes which occurred in the region of Greece between 1947 and 1966 have been used to derive statistical results about the direction of the acting stress component and orientation of faulting as mentioned in this paper.

TL;DR: In this paper, a genetic relationship between the fundamental drive in the form of horizontal translation and such possibly related phenomena as: 1) concomitant dip-slip displacements at the surface.

TL;DR: In this article, the authors propose a self-consistent model in which a peridotitic mantle, by processes of partial melting, magma segregation and further magma fractionation, may produce liquids ranging in composition from olivine melilite nephelinite to olivines tholeiite.

TL;DR: In this article, the Mohorovicic discontinuity has been studied by reflection seismology, gravity and magnetics, and it has been traced by gravity and magnetic trends for several hundred kilometers across Alberta and under the Rocky Mountains into British Columbia.

TL;DR: In this paper, a critical study is made of the practice and methods of correlating structures in metamorphic belts in order to construct regional syntheses of structural sequence, and various characteristics of folds used in correlation are evaluated in turn.

TL;DR: In this article, the shape of the normalized anomaly of high heat flow over the ridge is independent of spreading rate, however, the amplitude of this anomaly over the fast-spreading Pacific ridges is generally 0.5 μcal/cm2sec larger than that over the Atlantic and Indian Ocean Ridge which are spreading at a slower rate (1-2 cm/year).

TL;DR: A detailed analysis of a profile extending from near Gaya on the peninsular shield to a distance of 25 km from the Mount Everest indicates a 6.6 km thickness of light sediments beneath the Ganges Basin this article.

TL;DR: In this paper, the authors studied the main Ethiopian Rift and found that the region is dominated by north-northwest tensional faults which are oblique to the line of the rift valley.

TL;DR: In this paper, it was shown that about half of the old faults will be oriented approximately perpendicular to the axis of least compressive stress, forming favorable sites for fluid intrusion, and that the fault-plane solutions for such shocks should yield P -axes aligned with the dip of the seismic zone and T-axes parallel to the zone, although circumstances where the axes are interchanged can arise.

TL;DR: In this article, the epi-central determinations were based on continuous registrations from 1958 to 1963 of the seismological stations of the I.R.C.A. (Institut pour la Recherche Scientifique en Afrique Centrale).

TL;DR: In the Coast Range province of California, blueschist metamorphism probably occurred during thrusting in a zone of anomalously high water pressure in the lower plate along the sole of the thrust fault.

TL;DR: In this paper, a model of the crustal structures beneath the Rhinegraben rift system was derived based on results of seismic refraction and reflection measurements, which were supplemented by results of deep seismic reflection experiments carried out within the graben and in its adjacent regions.

TL;DR: In this article, a review of the general tectonic development of platforms is presented, which will help to determine the directions which geological-geophysical research should take within the Upper Mantle Project.

TL;DR: In this paper, a pillow-shaped body of material with compressional velocities of 7.2-7.7 km/sec was detected by seismic refraction measurements under the Rhine graben.

TL;DR: In this article, the authors investigated the formation of the oceanic crust by the sea-floor spreading mechanism and proposed a mobile lithospheric plate concept to explain the evolution of the seafloor.

TL;DR: In this paper, an elastic analog of Biot's theory of the multilayer is derived and the assumptions that lead to the theory are emphasized and discussed so that the theory can be modified to account for field observations.

TL;DR: In this article, the authors classified ultramafic rocks in terms of their field associations and tectonic environment and distinguished eleven associations, some with subdivisions, and emphasized that the variety of field and petrographic associations indicates that a variety of processes are involved in the origin and emplacement of these rocks.

TL;DR: In this article, it is suggested that the basalt magma type is controlled by the geothermal environment and a petrogenetic scheme is given for this, which increases the possibility of volcanism.

TL;DR: In this paper, a correlation of Late Precambrian strata is proposed and is made the basis of the definition of the Caledonian orogenic and sedimentation cycles.

TL;DR: The Baikal rift has no evident connection with the world rift system; moreover, it has a specific strain field in which, according to seismological data, near-horizontal stretching forces are dominant.

TL;DR: In this article, the physical and chemical aspects of metamorphism are brought together by relating rheology to metamorphic facies in the orogenic environment, and five regimes are considered.