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  • 1
    Publication Date: 2023-05-12
    Keywords: Conductivity, average; Depth, bottom/max; ELEVATION; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Number of temperature data; Sample, optional label/labor no; Temperature gradient
    Type: Dataset
    Format: text/tab-separated-values, 456 data points
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  • 2
    Publication Date: 2023-05-12
    Keywords: Conductivity, average; Depth, bottom/max; ELEVATION; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Number of temperature data; Sample, optional label/labor no; Temperature gradient
    Type: Dataset
    Format: text/tab-separated-values, 119 data points
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  • 3
    Publication Date: 2023-05-12
    Keywords: Conductivity, average; Depth, bottom/max; ELEVATION; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Sample, optional label/labor no
    Type: Dataset
    Format: text/tab-separated-values, 309 data points
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  • 4
    Publication Date: 2023-05-12
    Keywords: Conductivity, average; Depth, bottom/max; ELEVATION; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Number of temperature data; Sample, optional label/labor no
    Type: Dataset
    Format: text/tab-separated-values, 647 data points
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 135 (1991), S. 1-13 
    ISSN: 1420-9136
    Keywords: Terrain correction ; Lees' hill ; twin valley ; heat flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The theory of heat-flow variation over a Lees-type hill is well known for evaluating terrain effects on terrestrial heat flow. However, a hill cannot be converted into a valley by simply changing the sign of one of the terrain-defining parameters, nor can several Lees' hills be superposed to simulate a series of hills and valleys for correcting a terrain-induced disturbance of heat flow. The proper derivations for a Lees-type valley are presented and the superposition is compared with analytic solutions for two parallel semi-cylindrical valleys and two semi-spherical basins embedded in an otherwise planar ground. Generally, heat flux climaxes over central valleys or basins, and dips toward their margins where rapid change in topography occurs. Variation of heat flux induced by a three-dimensional terrain is relatively large, as compared to two-dimensional features, but its areal extent is relatively limited. The two-dimensional effects also extend relatively deeper. In applying two-dimensional algorithms to a three-dimensional terrain, the correction may be over- or underestimated depending on the distance from a borehole to prominent terrain features in the surrounding area.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK; Malden, USA : Blackwell Science Inc
    Ground water monitoring & remediation 25 (2005), S. 0 
    ISSN: 1745-6592
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: An analytical solution for steady-state soil vapor extraction (SVE) is derived for both pressure-controlled and flow-controlled well with nonuniform radial flux along the well screen. Since the flow rate and wellhead pressure are not lumped into a single variable, the solutions developed here can predict wellhead pressures required to achieve desired extraction rates. Simulations based on the established P (pressure) or P2 linearization of the governing air flow equation yield practically indistinguishable results for steady SVE. Existing numerical models for ground water flow can therefore be used to represent SVE in the P linearization for more complex vadose zone geometry and heterogeneous soils. The maximum differences between pressure distributions predicted by the nonuniform and uniform flux models occur near the ends of the extraction well screen and diminish with radial distance. Application to field test data indicates that estimates of horizontal and vertical soil-air permeability by the nonuniform flux model become similar to those obtained with the uniform flux model as the extraction well screen is shortened.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 29 (1991), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Vertical electrical soundings were used to map the presence or absence of an aquitard separating a shallow, contaminated aquifer from a deeper, uncontaminated one in San Bernardino Valley, California. Correlation of vertical electrical soundings with lithologie logs from adjacent wells allowed us to also map local variations in the elevation of the water table Comparison of known waste sites, the distribution of the aquitard, and elevation of the water table yielded probable directions of contaminant transport. We conclude that there is a significant hazard to municipal water wells due to possible transport of contaminants between the shallow and deeper aquifers.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: DC resistivity methods were used to confirm the existence of the Bryn Mawr fault and to evaluate its efficacy as a barrier to ground water in the Bunker Hill basin beneath the San Bernardino valley, California. Vertical electrical sounding indicates layering and vertical offsets across the fault. Dipole-dipole measurements located the fault and determined its attitude. Our modeling indicates that the fault gouge has decreasing resistivity with depth. The resistivity trend is likely caused by increasing clay content. If the interpretation is correct, the ability of the fault to impede ground-water flow will increase with declining water levels. This theory is supported by greater offset of water levels across the fault when the levels were deeper. DC resistivity methods independently yield models which are consistent with known hydrogeological conditions, and can be used to predict them.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 125 (1996), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Analytical solutions are derived for three modes of 1-D strike-slip frictional heating in a strip within a vertical fault zone that is embedded in an otherwise homogeneous medium. These include instantaneous and step-heating modes, as well as a preferred decay-heating mode in which the heating declines with time to a sudden end. Modelling results indicate that the evolution of temperature and pore-pressure rises varies with heating mode, but, at a time three times greater than the slip duration, the evolutionary paths for the different modes are practically indistinguishable. Generally the pressure front advances ahead of the temperature front by a distance of 1/D times the temperature-front distance, where D is the square root of the ratio of thermal to hydraulic diffusivity. A model based on the values of one plausible set of physical parameters suggests that temperature can increase by 100–320 K and pore pressure can rise by 5–16 MPa after 1 m slip under a mean resistive stress of 10 MPa. These estimates can be easily raised or lowered by 50 per cent, because some model-parameter values have uncertainties of one to two orders of magnitude.The estimated pore-pressure rise, being of the same order as the seismic stress drop, requires a large fault slip as a prerequisite. A lower pre-earthquake pore-pressure rise may bear a significant consequence on triggering earthquakes. Once a small aseismic slip begins, regardless of its initiating mechanism, the rise in pore pressure will weaken the frictional strength and lead to more slip. Pressure rise, fault weakening, and slip may reinforce one another through feedback processes that eventually escalate to earthquakes. Massive development of fractures during fault slip enlarges the pore volume; accordingly, the pore pressure is reduced and the frictional strength is raised. When the pore pressure drops below its pre-slip level, the slip stops abruptly. Thereafter, healing, sealing, compaction, and non-frictional heating re-initiate pore-pressure rise within the fault zone, setting the stage for another earthquake episode. Pre- and post-slip pore-pressure rises weaken the fault such that frictional heating is too low to yield an observable heat flow anomaly.
    Type of Medium: Electronic Resource
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