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11 Cards in this Set
- Front
- Back
In the equation for gravitational acceleration (photo) What is R and what is m when we make measurements using a gravimeter? |
R=Earths radius m= reference mass within the gravimeter |
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The major causes of mine subsidence in Marston, Cheshire are |
Poor mining practices and wild brine pumping |
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The manufacturer of the gravimeter used in Pringle at al reports drift and repeatability values of <5 muGal and <20 muGal/ day respectively. Given that the Booger anomalies for mine voids are mGal in magnitude, can we trust their conclusions? |
Yes, mGal anomalies are much larger than the drift and repeatability values |
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In their presentation on Pringle, E.G. 2 suggest that remediation efforts in Northwhich might have a gravitational effect. How might we know for sure? |
Determine density and volume of cement and computer terrain correction Determine whether remediation happened before, during or after the marstin survey and computer terrain cirrection Determine the distance of the remediation site from each survey and computer terrain correction |
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FORMATS Principle states that waves travel a minimum time path arrive in phase |
True |
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A ray represents a seismic wavefront in geologic layer approaches a second layer at 7°. If the station of the first and second velocity is 3/3.2 at what angle does the ray approach a third layer? |
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Ray parameter p for a ray in a laterally homogeneous medium is P=4.0623×10^-5 If the layer is 3000 m/s at what angle does the ray travel? |
???? |
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For travel time T(x,z) In a homogeneous medium,_____ gives the minimum travel path |
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In the refraction method, why must we eliminate the surface layer velocity independently? |
The direct arrival is weak and often not present |
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(Photo) Is the traveltime intercept for N layers How do we compute the thickness of the second layer and what measurement do we need to measure for? |
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(PHOTO) Is the equation for traveltime intercept that we measure for a critical refraction through a surface layer. Which symbol is the slope that we measure? |
A2 |
