Showing papers on "Mohorovičić discontinuity published in 1965"
TL;DR: In this article, a model of the crustal structure is presented which is consistent with three semi-independent sources of geophysical data: seismic refraction, seismic reflection, and gravity.
Abstract: Interpretation of a reversed seismic-refraction profile between Lake Mead, Nevada, and Mono Lake, California, indicates velocities of 615 km/sec for the upper layer of the crust, 710 km/sec for an intermediate layer, and 780 km/sec for the uppermost mantle Phases interpreted to be reflections from the top of the intermediate layer and the Mohorovicic discontinuity (M) were used with the refraction data to calculate depths The depth to M increases from about 30 km near Lake Mead to about 40 km near Mono Lake Variations in arrival times provide evidence for fairly sharp flexures in M Offsets in M of 4 km at one point and 2½ km at another correspond to large faults at the surface, and it is suggested that fracture zones in the upper crust may displace M and extend into the upper mantle The phase P¯ appears to be an extension of the reflection from the top of the intermediate layer beyond the critical angle Bouguer gravity anomalies, computed for the seismic model of the crust, are in good agreement with the measured Bouguer gravity anomalies Thus a model of the crustal structure is presented which is consistent with three semi-independent sources of geophysical data: seismic refraction, seismic reflection, and gravity
38 citations
TL;DR: In this article, a normal crustal transition to a true ocean basin is indicated across the narrow continental margin to the southwest of Kangaroo Island and a depth of between 11 and 12 km is obtained for the Mohorovicic discontinuity in the ocean basin and a P n velocity of 8·27 km/sec.
21 citations
TL;DR: This distinctive discontinuous layer separates the crust and the mantle of the Earth and extends from 30 km to 50 km below the continents and about 10 km below sea-level in the ocean basins.
Abstract: THIS distinctive discontinuous layer separates the crust and the mantle of the Earth and extends from 30 km to 50 km below the continents and about 10 km below sea-level in the ocean basins. It has been estimated1 that this layer has a temperature of 500°–600° C at the base of the continental crust and 150°–200° C in the sub-oceanic discontinuity. This layer is also under a compressive stress of about 10 kilobars (the mean pressure at 35 km is about 10 kilobars) and it has an average density of about 4.0 g/cm3 as measured by the velocities of seismic waves.
15 citations
TL;DR: The continental slope bordering the Bahamian Platform to the east descends precipitously from a shallow edge to oceanic depths, and considerations based on isostatic equilibrium suggest that in this area the oceanic crust may approach the edge of the shelf within a distance as short as 8.5 km.
Abstract: The continental slope bordering the Bahamian Platform to the east descends precipitously from a shallow edge to oceanic depths. Sustained slopes of at least 40 degrees have been found east of San Salvador. Considerations based on isostatic equilibrium suggest that in this area the oceanic crust may approach the edge of the shelf within a distance as short as 8.5 km. If so, it may be possible to drill and sample a substantial portion of the transitional crust by means of directional drilling techniques from a rig located at the edge of the shelf. It may even be possible, at some future time, to cross the entire crust, pierce the Mohorovicic discontinuity, and penetrate the mantle.
11 citations