Geophysics Review Flashcards
geoid.
equipotential surface
sum of gravity and centrifugal forces
circ of earth is?
40,000km
difference between the equator and the poles is approx?
21km
in exploration geophysics, what is a measurement that is widely used?
Gravity measurement
gravity measurements must always compensate for the direction of travel
whether you are flying / travelling with or against the Earth’s rotation
true or false
p waves: travels in solids and liquids, most common in exploration, has a longitudinal displacement, the fastest wave length, is a push-pull / compression-dilatation
True
true or false
s - waves: shake, displace perpendicular, do not propagate through a fluid, have half the vel. of a P-wave, have double the amplitude of a p-wave
true
list the order for arrival times for earthquake seismology
p-wave, s-wave, surface wave
under the electromagnetic spectrum, what has the longest and shortest wave length?
Longest, radio waves
Shortest, Gamma
what are the two modes of mechanical waves?
P and S – Longitudinal and Transverse
what are the six processing basics?
Velocity Statics Noise Removal ----random and coherent Deconvolution Moveout correction Migration (imaging)
what processing basic stops the summing of data?
moveout
With RMS Velocities
what is the actual shape of reflection?
Bell shape
In RMS velocities how may the actual shape, bell shape, be approximated?
VIA a hyperbola
in RMS velocities What do complex rays in depth =?
Straight rays in time