Journal ArticleDOI
The effects of pressure, temperature, and pore water on velocities in westerly granite
James W. Spencer,Amos Nur +1 more
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In this article, an experimental assembly was developed to conduct concurrent measurements of compressional and shear wave velocities in rocks at high temperatures and confining pressures and with independent control of the pore pressure.Abstract:
A description is presented of an experimental assembly which has been developed to conduct concurrent measurements of compressional and shear wave velocities in rocks at high temperatures and confining pressures and with independent control of the pore pressure. The apparatus was used in studies of the joint effects of temperature, external confining pressure, and internal pore water on sonic velocities in Westerly granite. It was found that at a given temperature, confining pressure has a larger accelerating effect on compressional waves in dry rock, whereas at a given confining pressure, temperature has a larger retarding effect on shear waves.read more
Citations
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Seismic imaging of the magmatic underpinnings beneath the Altiplano-Puna volcanic complex from the joint inversion of surface wave dispersion and receiver functions
TL;DR: In this paper, the authors presented new 3D seismic images of the APVC crust based on a joint inversion of Rayleigh-wave dispersion from ambient seismic noise and P-wave receiver functions from broadband seismic stations recently deployed in the area.
Journal ArticleDOI
Three‐dimensional seismic tomography from P wave and S wave microearthquake travel times and rock physics characterization of the Campi Flegrei Caldera
TL;DR: In this paper, a multidisciplinary approach dealing with three-dimensional delay time tomography and rock physics characterization has been followed to explore the structure of the Campi Flegrei Caldera as well as the role of hydrothermal fluids on velocity changes.
Journal ArticleDOI
The effect of high temperature and high confining pressure on compressional wave velocities in quartz-bearing and quartz-free igneous and metamorphic rocks
TL;DR: In this paper, the intrinsic effect of temperature on velocities is hard to determine due to thermal expansion and consequent loosening of the structure and the opening of new cracks and widening of old cracks causes a large decrease in compressional wave velocity.
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Ambient seismic noise tomography of Australian continent
Erdinc Saygin,Brian Kennett +1 more
TL;DR: In this paper, the authors presented a continent wide study of the Australian crust based on the exploitation of continuous data from extensive portable broad-band deployments across Australia and the permanent stations, where over 2000 Rayleigh wave components of the Green's functions were extracted from the inter-station cross-correlations and provided a reasonably uniform sampling of the continent.
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Shear-Wave Velocity Structure in the Northern Basin and Range Province from the Combined Analysis of Receiver Functions and Surface Waves
TL;DR: In this paper, a joint inversion of receiver functions and surface-wave phase velocities was used to determine shear-velocity structures that are consistent with the compressional-wave structure, gravity, heat flow, and elevation data in the northern Basin and Range.
References
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Journal ArticleDOI
The velocity of compressional waves in rocks to 10 kilobars: 1.
TL;DR: The velocity of compressional waves has been determined by measurement of travel time of pulses in specimens of rock at pressures to 10 kilobars and room temperature as mentioned in this paper, mainly igneous and metamorphic rocks, furnished three specimens oriented at right angles to one another.
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Properties of some common igneous rocks and their melts at high temperatures
TL;DR: The properties of four igneous rocks (a tholeiitic and an alkali-olivine basalt, an andesite, and a rhyolite) and a synthetic lunar sample have been determined at atmospheric pressure over a range of temperatures including their melting interval as discussed by the authors.
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On the Dependence of the Elastic Properties of a Porous Rock on the Compressibility of the Pore Fluid
Robert J. S. Brown,Jan Korringa +1 more
TL;DR: In this paper, the authors derived an equation for the dependence of the elastic properties of a porous material on the compressibility of the pore fluid in a container of arbitrary shape, where elastic properties are related to the compressible of the fluid filling a cavity in the container.
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The effect of saturation on velocity in low porosity rocks
Amos Nur,Gene Simmons +1 more
TL;DR: The shape of the pores in typical crystalline rocks plays an important role: increase in V p due to saturation of pores occurs when the pores are in the form of cracks but not when they are in a round hole as discussed by the authors.