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The rate of temperature increase with depth is known as the geothermal gradient.
Extensions reached deep into the ground to draw energy from the geothermal gradient.
Similarly, it has found some limited use in prospecting for geothermal gradients.
With the addition of an assumed or measured geothermal gradient, we can model the pressure and temperature conditions at any point in our earth model.
Geothermal gradient is the rate of increasing temperature with respect to increasing depth in the Earth's interior.
The geothermal gradient was measured at a gas seep in Smithton as 26.4 degrees/km.
In some cases, the high temperatures are difficult to account for at the inferred depths at typical geothermal gradients.
The first is to drill for and locate hot water (having first mapped the geothermal gradient of the ground since conditions vary considerably).
The data indicate a high geothermal gradient extending from shallow crustal depths down to the mantle, with melt probably present at 50km depth.
The geothermal gradient has been used for space heating and bathing since ancient Roman times, and more recently for generating electricity.
The geothermal gradient varies with location and is typically measured by determining the bottom open-hole temperature after borehole drilling.
Melt water from the polar ice caps flowing along ocean bottoms tends to maintain a constant geothermal gradient throughout the Earth's surface.
Within the solid earth, the temperature of a rock is controlled by the geothermal gradient and the radioactive decay within the rock.
Foreland basins are considered to be hypothermal basins (cooler than normal), with low geothermal gradient and heat flow.
"Fossil" cold anomalies in the Geothermal gradient in areas where deep permafrost developed during the Pleistocene persist down to several hundred metres.
In the southern part of the gulf, the Miocene source intervals become important as higher geothermal gradients cause parts of the syn-rift sequence to reach maturity.
The physical properties of minerals must be understood to infer the composition of the Earth's interior from seismology, the geothermal gradient and other sources of information.
In areas where faulting is present, salt layers or domes are predicted, or excessive geothermal gradients are known, drilling operations may encounter abnormal pressure.
The lack of LVZ beneath continental shields is explained by the much lower geothermal gradient, preventing any degree of partial melting.
Bottom-hole temperatures from wells in southern England suggest that the region has a present geothermal gradient close to the world average for cratonic areas of 25 C/km.
If the geothermal gradient was as low as 25 C/km preservation of condensate and even oil would have been theoretically possible in parts of the hanging wall.
A cover of early Carboniferous shales provided thermal insulation to enable the brines to reach temperatures exceeding 200 C under an enhanced geothermal gradient.
For these wells either the section has been buried more deeply in the past than at present or geothermal gradients have been significantly higher in certain parts of the basin.
Thermal conductivity was estimated from compaction data to derive a temperature profile which was constrained by known present-day geothermal gradients (see Oxburgh and Andrews-Speed 1981).
If water-saturated zones still exist in sediments under the volcano, they would likely have been kept warm by a high geothermal gradient and residual heat from the volcano's magma chamber.
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