# Tag Info

## New answers tagged geophysics

1

Warning : I absolutely don't know nothing about the subject. If you are a french locutor, applyed notion of kinematical inversion (and dynamical inversion) to the Tottori earthquake are explained in this thesis (Sara Di Carli), see page $4$ for a abstract, and pages $11-29$ for details. The Haskell Model(1964) seems to be the first model. In the ...

2

I would think that a hardened hole saw approach would be most efficient. Bore a short distance into the rock with a self-augering hole saw the diameter of the desired tunnel and then impacting the center of the core to break out the center, remove the broken material and then take the next bore. Where is the sense of pulverizing the center material to dust ...

0

I've been thinking about this lately but I think that u missed something you all are saying that much energy will be needed to make the coil spin I've an objection on this it depends on the shape of the coil and its position also material used. I think if the coil was made to be wide and not long and just flought horizontal away enough from the earth ...

12

"Total energy of the Earth" is somewhat of an odd concept, but there's no reason we can't really entertain it. It brings up some genuinely difficult questions. The right way to approach this is to define the system correctly and then identify forms of energy content and flows. Things to "count" in the Earth's energy: Heat content Nuclear energy ...

6

The heat generated from the Earth's core is about 4x10^13 W while the Sun provides about 1.7x10^17W so although the Earth's core is slowly cooling this has very little effect on the Earth's temperature. The Earth is in equilibrium between the energy received from the sun and the energy it emits into space. If the amount received changes, then temperature of ...

2

I'd say depends on the definition of 'total energy' - see Alan's answer above. The total thermal energy is not in equilibrium, it is increasing: global warming, that is an imbalance of around 0.5 W/m^2, corresponding to a total imbalance of 2.5x10^14 watts (if I did the multiplication correctly...)

0

Probably Mt. Chimborazo has the MOST gravity, as being in the "fattest" part of the planet and as one of the highest mountains you will have LOTS of mass generating more gravity (remember the more mass, the more gravity).

2

In the equation: $$T_2 = T_1 + \left( \frac{1}{v} \frac{2h}{\cos (\theta)} \right)$$ the bit in brackets is presumably the time taken for some signal to travel from the surface down the red line, reflect at the first bounday then travel back to the surface again. Let us pick out half the red triangle: If the signal velocity is $v$, and the length of ...

1

Most certainly it does: the variation can be measured by a sensitive acceleration called a Gravimeter (see Wikipedia page with this name) and is the basis for gathering data important for minerals exploration. Bodies of mineral ore distort the Earth's gravity and thus can be found by measuring the variation of the local gravitation as a function of position. ...

3

The acceleration due to gravity changes not only on the surface of the Earth (depending on where you are) but also how high up you are (which varies by $\frac{1}{r^{2}}$, where $r$ is the distance from the center of the Earth to you). For more information on how it varies depending on location, maybe this will be of use? GOCE Delivers Best Gravity Map of ...

0

Hardy's "Basic Seismic Processing for Interpreters" has a chapter called "Migration in Practice" that addresses your question in a general way. As a personal aside, your question reminded me of my early career in northern Canada exploring for oil on a reflection seismic crew in the 1950s.

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