Showing papers in "Tectonophysics in 1970"

TL;DR: The study of the Anatolian fault zone shows that major earthquake sequences associated with faulting have been occurring in the zone since historical times with periods of quiescence of 150 years as discussed by the authors.

TL;DR: In this article, it was shown that large heat generation along the deep-earthquake fault zone and effective heat transfer in the upper mantle above the deep earthquake zone is required to explain the heat flow pattern across island arcs and marginal seas.

TL;DR: In this article, the authors examined the elastic flexure of the lithosphere under the load of the volcanic rocks of the Hawaiian Ridge and found that a similar pattern of flexure is produced by a loaded unbroken lithosphere while the calculated amplitudes of displacement are less than half those observed.

TL;DR: In this article, an instability caused by sudden brittle fracture of locked regions on surfaces in contact is the most likely explanation for stick-slip during dry frictional sliding of brittle rocks at room temperature.

TL;DR: In this paper, a method for constructing strain ellipsoids for rock domains which have deformed homogeneously is described, which is applicable to gneisses as well as to deformed rocks of lower metamorphic grade.

TL;DR: In this article, the effects of mechanical stresses on the magnetization of the earth's crust can be classified in two categories: (a) the reversible effect which disappears when the stress is removed; and (b) the irreversible effect which causes an irreversible enhancement or an irreversible demagnetization of remanent magnetization.

TL;DR: In this article, the presently fashionable hypothesis of ocean-floor spreading is examined and conclusion is drawn that this hypothesis is unacceptable, and the authors conclude that the currently fashionable hypothesis is not the best hypothesis.

TL;DR: In this article, a linear buried anticlinal structure, inferred from analysis of surface ship gravity profiles, may mark the site of contemporary intrabasinal underthrusting.

TL;DR: In this paper, the potential temperature within a convecting fluid is defined as the distance which heat diffuses in the time taken for the material to overturn is appreciably smaller than the scale height.

TL;DR: In this paper, heat flow measurements have been made in the seas adjacent to the Nansei Shoto (Ryukyu) islands, and the result seems to be an evidence for the present activity of the Ryukyu Arc system.

TL;DR: In this article, it was shown that if the water is saturated or supersaturated with water, boiling off the water during intrusion causes a low viscosity precursor of the magma which greatly facilitates intrusion.

TL;DR: A small, dense network of independently recording portable seismograph stations was used to delineate the slip surface associated with the 1966 Parkfield-Cholame earthquake by precise three dimensional mapping of the hypocenters of its aftershocks.

TL;DR: In this article, the kinegeosyncline is proposed for the contracting trough, trapped between continental margins and growing orogens, where the arrival of a continental mass, with its continental margin sediments, at a trench results in collision and an orogen, which may suture continents together.

TL;DR: In this article, a large collection of samples from a key area, the Bolzano Quartz Porphyry Plateau in the Southern Alps, was examined and their natural remanent magnetization was analyzed with thermal, and mainly alternating field demagnetization.

TL;DR: The distribution of heat flow in the Philippine Sea is very complicated as discussed by the authors, as it has neither uniformly high nor low heat flow but shows numerous adjacent areas of high and low heat flows.

TL;DR: In this paper, a finite difference solution of the conservation of energy equation is used to estimate the temperatures in and at the vicinity of a downgoing slab of a tectonic slab, taking into account ocean floor spreading rate, adiabatic compression, phase changes, heat sources and strain heating.

TL;DR: In this article, the phase velocity of Rayleigh waves across part of the Pacific Ocean has been measured by a modification of the single-station technique and a phase velocity curve with an unusual reversed slope has been obtained for a line crossing the East Pacific Rise.

TL;DR: A type-section of the Archaean Kalgoorlie system, Western Australia, displays a trend of evolution from the eugeosynclinal ophiolite stage into the turbidite-deposition stage, which grades into a molasse-like conglomerate stage representing the termination of geosyn-clinal deposition.

TL;DR: In the case of lake-reservoirs the comparison of the phenomena in these different examples leads to several remarks as mentioned in this paper, such as: the earthquake activity is particularly clear when the reservoir is deeper than 100 m, the height of the water seems to be more important than the total volume of the reservoir.

TL;DR: The Caspian and Black Seas' deep basins are similar, having suboceanic type of the crust, low average seismic velocity, absence of earthquakes and relatively small variation of magnetic anomalies as mentioned in this paper.

TL;DR: Theoretical studies show that when a thin viscous layer embedded in a viscous medium is subjected to compression in two perpendicular directions in the plane of the layer, the lengths of arc in the two directions, λ 1 and λ 2, are related by the equation as mentioned in this paper.

TL;DR: Paleomagnetic survey of Middle and Upper Triassic porphyrites, dykes, and tuffites from the Dolomites (Eastern Alps, Italy) has yielded an average direction (based on 57 samples from 12 collecting localities) with declination 329°E of true north and inclination +25° after magnetic cleaning and correction for geological dip as mentioned in this paper.

TL;DR: In this paper, the authors compare the distribution of seismic events in an aftershock sequence generated by fluid injection near Denver, Colorado with earthquakes triggered by nuclear explosion at the Nevada Test Site.

TL;DR: In this paper, a detailed analysis of the Laxfordian regeneration of an older gneiss complex within the Lewisian of the Outer Hebrides was carried out and it was shown that the deformation occurred in three and locally four phases, the second and third (F 2 and F 3 ) being the most important.

TL;DR: The mechanism of the Spanish earthquake of March 15, 1964 has been investigated by means of body and surface waves as discussed by the authors, and the double-couple source orientation obtained from the body-wave analysis agrees with the Rayleigh waves radiation pattern which selects the plane of faulting as that striking N 65°E and dipping 80° NE.

TL;DR: In this paper, a detailed survey of Peake and Freen deeps was carried out and nine closely spaced heat flow observations were made near 43°N 20°W during the survey.

TL;DR: In this paper, the authors used air-dried samples of two holocrystalline basalts and a diabase at atmospheric pressure ranges from 5.0-5.6 km/sec.

TL;DR: In this article, the authors measured the thickness of the layers in the fold noses and the amounts of shortening on the fold limbs of a phyllite with alternating mica-rich and micapoor layers.

TL;DR: In this paper, heat flow at six places in the Godavari Gondwana Basin of India are presented based on measurements in boreholes of depths of 190-310 m. Heat flow at Chintalapudi and Aswaraopet in the southern part of the valley is high (2.22 and 2.49).

TL;DR: In this paper, the authors investigated the connection between earthquakes and irregularities of electrotelluric field and found that the observed electric anomalies are found to arise some hours before the earthquakes and at the moment of the shock.