Showing papers in "Physics of the Earth and Planetary Interiors in 1969"

TL;DR: In this paper, the early thermal history of the Earth is reconsidered with the constraint that core formation occur before the emplacement of the oldest known rock possessing remanent magnetism.

TL;DR: In this paper, the authors present an Earth model HB1 which satisfies the revised value of the Earth's moment of inertia I and observational data on free Earth oscillation periods, which is reasonably compatible with evidence from other sources, including seismic bodily wave travel-time data and evidence on density variation, and marks the completion of the first stage of seeking improved Earth models.

TL;DR: In this paper, the universal equations of state for oxides and silicates were defined based on experimental data including elastic properties, density, mean atomic weight relations and geophysics interpretations.

TL;DR: In this article, a velocity structure for the lower mantle is deduced using the Wiechert-Herglotz formula, and regions of anomalous velocity change occur in the vicinity of 700, 1150 and 2000 km depth, and there is a possibility of an additional anomaly at about 2500 km.

TL;DR: In this article, the decay of the NRM of 146 specimens (including the 41 specimens reported on earlier) of igneous rocks during heating in steps of 25 or 50 °C between 200 or 300 °C and 550 °C was compared to the acquisition of TRM (H = 0.35 Oe) during subsequent cooling to 20 °C.

TL;DR: The ringed maria was created by the mass transfer mechanism as mentioned in this paper, where the dense root past isostatic equilibrium in the weak area caused by the impacting body was pushed past the weak region.

TL;DR: In this article, a palaeomagnetic study of samples from 8 localities along the Upper Carboniferous is presented, where alternating field and thermal demagnetization studies reveal secondary components of both low and high stability.

TL;DR: In this paper, the intrinsic internal friction (Q −1 ) at each depth is taken to be due to a single thermally activated relaxation mechanism and the intrinsic Q −1 is completely specified by a simple function of frequency, temperature, and pressure.

TL;DR: In this paper, the paleomagnetism of fifty samples of red sandstones collected from three different sites belonging to the Parsora formation of Upper Triassic age has been studied.

TL;DR: The residual displacement and strain fields are computed at the free surface of a non-gravitating, homogeneous, isotropic, elastic sphere resulting from faulting inside the sphere as discussed by the authors.

TL;DR: In this article, a moment of inertia of 0.39 was determined from the Lunar Orbiters, based on composition and phase change studies of the corresponding pressure region, the upper 150 km, of the Earth.

TL;DR: In this paper, the arrival times of a seismic wave at two stations of the order of ten kilometers apart were used to determine the variations of the crustal thickness of the earth's crust.

TL;DR: In this article, a statistical analysis of the regional geomagnetic anomalies and from the regional Bouguer anomalies is used to determine the depth of magnetization and density contrasts in the earth's crust.

TL;DR: In this paper, the first eigenvalue of stationary convection in an enclosed core in the presence of a uniform magnetic field was shown to be critical for the rate of heat generation in the core.

TL;DR: In this paper, the power density spectra of consecutive hourly values of the dominant period of micropulsations in the period range 10 seconds to 200 seconds have been computed in order to detect periodic variations in the dominant periods.