Showing papers in "Physics of the Earth and Planetary Interiors in 1972"

TL;DR: In this article, the mechanism of the Aleutian islands earthquake of 1946 and the Sanriku earthquake of 1896 is studied on the basis of the data on seismic waves from 5 to 100 s and on tsunamis.

TL;DR: In this article, the authors studied the tectonic process taking place in the south-western part of Japan to the north of the Philippine Sea and found that these two earthquakes represent a low-angle thrust faulting whose slip vector is almost parallel to that of other great earthquakes in the north-western Pacific; the oceanic side is underthrusting beneath the continent.

TL;DR: In this paper, the thermal state of terrestrial bodies is discussed as an aspect of their internal dynamics for bodies of roughly meteoritic composition in the range of sizes of planetary objects, and it is shown that for the whole range of physically plausible values of the material parameters, the temperature distribution associated with a solution to the problem of internal dynamics, for bodies with external radii larger than about 800 km departs significantly from that predicted on conduction theory arguments.

TL;DR: In this paper, a large deep-focus earthquake ( h = 577 km) in the western Brazil region that occurred on November 9, 1963, was followed by a relatively large aftershock.

TL;DR: In this paper, the authors used the records of the Tottori earthquake of 1943 (M = 7.4, 35.5° N, 134.2° E, depth 10 km) about by a low-magnification seismograph at a relatively short distance to determine dynamics fault parameters such as the particle velocity and the effective tectonic stress.

TL;DR: A sample of Fe2SiO4 (spinel) at approximately 250 kbar in a diamond anvil press was heated to approximately 3000 C for a duration of some ms using a focused light beam from a pulsed ruby laser.

TL;DR: The source mechanism of two large earthquakes which occurred off the coast of Peru on October 17, 1966 and on May 31, 1970, are determined on the basis of long-period surface-wave data at many worldwide stations.

TL;DR: In this paper, the focal process of the Rat Island earthquake of March 30, 1965, which occurred beneath the Aleutian trench, is studied on the basis of the long-period surface-wave data and the spatial distribution of the aftershocks.

TL;DR: In this article, the source dimensions, stress-drops and apparent average stresses of 19 Tonga-Kermadec earthquakes with depth greater than 79 km were estimated from the amplitude spectra of body waves.

TL;DR: In this article, a limited number of SKP phases has been used as an aid in the analysis of core phases and their precursors and the results indicate that diffraction effects may play a more important role in the generation of the precursor than is generally assumed.

TL;DR: The fourth-order anharmonic theory as discussed by the authors is an extension of the ordinary theory of lattice dynamics into the regime of finite strain, and it has been used extensively for numerical applications at high pressure, yielding predictions for density, temperature and elastic moduli of seventeen solids under shock compression.

TL;DR: The first motions of P-wave and S-wave polarization angles for a shallow shock that occurred on July 25, 1965, at about 70 km oceanward from the Kuril trench indicate a double couple dip-slip source with a horizontal tension axis in the direction perpendicular to the trench.

TL;DR: In this paper, the authors used the ellipticity of the first isoseismal to determine the horizontal extent of several earthquake sources, and the remaining isoseismsals allow an estimate of the "normal" or average depth of the rupture.

TL;DR: In this paper, the moments, source dimensions and stress drops for 34 shallow-focus earthquakes in the Tonga arc between 1963 and 1969 were estimated using the corner frequency of the P and S wave spectra using Brune's theory.

TL;DR: In this paper, it was shown that the light element in the core of the earth is largely sulphur with minor amounts of carbon, and that the only feasible mechanism is the segregation of an Fe-FeS melt.

TL;DR: In this article, a detailed study of times and amplitudes of P waves in the range 95° < Δ < 120° from two intermediate focus earthquakes has provided new information on the physical state of the transition shell D″ just above the core.

TL;DR: In this paper, the isotropic elastic properties of several oxides and silicates containing Cr, Mn, Fe or Ni have been determined as a function of pressure and temperature using the high-precision techniques of ultrasonic elements for Mg and Al in the corundum, spinel and olivine lattices.

TL;DR: In this article, a two dimensional model of blocks connected to one another by springs is used to simulate earthquakes and the frequency of occurrence of events (slips of one or more blocks) as a function of the number of blocks that slip (size of the event) is found to obey a relation similar to Gutenberg and Richter's frequency-magnitude relation for earthquakes.

TL;DR: In this article, the effects of stress states on fracture and flow properties of roks were experimentally studied by a triaxial compression method, in which all three principal stresses are independently controllable.

TL;DR: In this article, the partitioning of potassium between roedderite, K2Mg5Si12O30 and an Fe-FeS melt was investigated at temperatures about 40 C above the FeFeS eutectic.

TL;DR: In this paper, the equation of state of hydrogen was calculated for specific volumes ranging from 0.01 to 0.0001 cm3/mole and for temperatures ranging from 200 to 1 million K.

TL;DR: In this article, the age of the pole in the basement is determined from U/Pb determinations on zircons, K/Ar determinations of biotite, microline and total rock.

TL;DR: In this article, over six hundred values of the P wave travel-time gradient (dT/dΔ) have been derived from 224 events recorded at the Warramunga Seismic Array over the distance range 28° to 99°.

TL;DR: The orientation of the principal stresses vary from region to region. as mentioned in this paper showed that the vertical normal stress is approximately equal to the weight of the overburden, but in some places it is larger and in others it is smaller.

TL;DR: In this article, a number of model atmospheres for Jupiter and Saturn were considered and the ammonia abundance below the NH3 cloud level was determined by comparing the observed thermal spectrum of Jupiter and the total spectrum of Saturn with the model calculations.

TL;DR: In this article, the authors discussed the instability of a buoyant stratum buried deep in the mantle and predicted an episodic character of tectonic evolution because the rate of ascent of a layer increases faster than linearly with its thickness.

TL;DR: In this article, the effect of rock texture on thermal conductivity is shown to be negligibly small for nonporous, macroscopically isotropic and homogeneous rocks.

TL;DR: In this article, a new method for the measurement of thermal conductivity of rock is presented, where a rock specimen is pulverized into fine powder, mixed with distilled water, and the conductivities of the mixture is measured by the needle-probe technique.

TL;DR: In this paper, a source study was made on the basis of long-period surface-wave data, on a large intermediate-depth earthquake that occurred in the South Sandwich Islands region on May 26, 1964.