The Thermal Field of the Earth

Eppelbaum, Lev; Kutasov, I.M.; Pilchin, Arkady

doi:10.1007/978-3-642-34023-9_1

Cited by 2 publications

(3 citation statements)

References 359 publications

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“…The thermal conductivity parallel to the foliations is up to 2.5 times higher than the one perpendicular to the foliations (Popov et al, 1999;Eppelbaum et al, 2014). By assuming that the foliations are oriented parallel to the bedding planes, heat is transferred parallel to the foliations along the B1-B2 plane.…”

Section: Bedrock Anisotropymentioning

confidence: 99%

Experimental and numerical investigation of a long-duration Thermal Response Test: Borehole Heat Exchanger behaviour and thermal plume in the heterogeneous rock mass

et al. 2018

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A B S T R A C TThis paper presents in-situ measurements of a long-duration Thermal Response Test (TRT) (heating phase of 7 months), conducted in a heterogeneous bedrock of conduction dominated heat transfer. The in-situ test was simulated by 3D numerical modelling, by assuming homogeneous and isotropic ground conditions considering the TRT data of the first few days. Based on the analysis of the experimental and numerical results, the behaviour of the Borehole Heat Exchanger for longer heating and recovery periods can be predicted based on the typicalduration TRT results. However, this behaviour is sensitive to the heat input variations, indicating the need for an accurate estimation of the energy needs of the building and the variable thermal loading during the operation of the system. Critical factors for the prediction of the temperature field evolution in the surrounding ground were detected based on the analysis of high-resolution temperature profiles. They include the distance to the heating source, borehole bottom end effects, bedrock heterogeneity and air temperature variations. Anisotropic effects are not detected, despite the expected anisotropic behaviour of the bedrock.

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Section: Bedrock Anisotropymentioning

confidence: 99%

Experimental and numerical investigation of a long-duration Thermal Response Test: Borehole Heat Exchanger behaviour and thermal plume in the heterogeneous rock mass

et al. 2018

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“…Although the Pleasant Valley earthquake is the largest earthquake in Nevada's historical record, it does not have a well-constrained moment magnitude. The estimated magnitude of this event varies from M w 5 6.9 to 7.5 [Lienkaemper, 1984;Wallace, 1984;Doser, 1988;Wells and Coppersmith, 1994;Caskey et al, 1996;dePolo and Anderson, 2000;Pancha et al, 2006]. We consider the magnitude of this earthquake as a variable in our analysis.…”

Section: Postseismic Modelingmentioning

confidence: 99%

“…Extrapolation of geothermal gradients to depth is known to be in error by as much as 15% at lower crustal depths [Eppelbaum et al, 2014]. Our modeled geotherm is fixed by our choices of internal heat production, temperature at the Moho, and accuracy of surface heat flow measurements.…”

Section: Geothermal Gradient Modelingmentioning

confidence: 99%

Inference of the viscosity structure and mantle conditions beneath the Central Nevada Seismic Belt from combined postseismic and lake unloading studies

Dickinson

Freed

Andronicos

2016

Geochem. Geophys. Geosyst.

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We test whether a single depth‐dependent Newtonian viscosity structure can be found to explain measured surface deformation in Western Nevada from two separate loading events: tectonic loading from a series of seven historic earthquakes in the Central Nevada Seismic Belt and nontectonic loading from the formation and evaporation of co‐located Pleistocene‐aged Lake Lahontan. Rheologic studies are generally plagued with nonuniqueness issues due to the limitations of observational constraints. Here, we reduce nonuniqueness by solving for a single rheologic structure that can simultaneously satisfy all observational constraints associated with all events. Model results suggest that Western Nevada is underlain by a strong lower crust (order 1020 Pa s), a relatively weak mantle (order 5 × 1018 Pa s) from 40 to 80 km, and a much weaker mantle (order 1018 Pa s) below 80 km. We would thus place the mechanical lithosphere/asthenosphere boundary (LAB) at 40 km depth. Thermal modeling of conductive geothermal gradients, combined with melting curves calculated for enriched and depleted mantle compositions suggest that the viscosity decrease at 40 km depth (the LAB) is associated with the onset of wet melting of mantle lithosphere hydrated by past subduction and is about 10 km shallower than the inferred transition from conduction to convection.

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The Thermal Field of the Earth

Cited by 2 publications

References 359 publications

Experimental and numerical investigation of a long-duration Thermal Response Test: Borehole Heat Exchanger behaviour and thermal plume in the heterogeneous rock mass

Experimental and numerical investigation of a long-duration Thermal Response Test: Borehole Heat Exchanger behaviour and thermal plume in the heterogeneous rock mass

Inference of the viscosity structure and mantle conditions beneath the Central Nevada Seismic Belt from combined postseismic and lake unloading studies

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