All Questions
Tagged with geophysics waves
14 questions
0
votes
0
answers
26
views
I'm a theoretical physics with no insights in Earth Science. Is this exercise dealing with Love Waves?
I was studying Landau's elasticity book and I'd like to enhance my physical views on this problem:
"A plane-parallel slab with thickness h (medium 1) lies on an elastic half-space (medium 2).
...
1
vote
0
answers
50
views
What happens to seismic waves reflected back to the surface?
What would be the behavior of seismic waves when it hit the geological media?
The waves coming from a source hits different boundaries with different energies, the wave will be reduced in energy by ...
- 11
1
vote
0
answers
61
views
What are the boundary conditions for Navier's Equations of motion in seismic?
Navier's equations of motion in seismic have 3 solutions, according to how it is resolved (boundary conditions):
for Vp (compression waves)
for Vs (shear waves)
for Vr (Rayleigh waves)
I know the ...
- 111
1
vote
1
answer
158
views
What would be the phase shift and polarity of a seismic wave upon reflection
What would be the phase shift and polarity of a seismic wave a) when it hit the free surface
b)when the free surface reflection goes down and hit a reflector and returned to the receiver placed on the ...
- 111
6
votes
1
answer
898
views
How does multiple layer seismic reflection work? How do we distinguish arrivals from different layers and their velocities?
Whenever we are investigating multiple layer interfaces in a seismic reflection survey the root-mean-squared velocity is often employed to deduce travel time to a certain n-th layer and also to deduce ...
- 303
3
votes
2
answers
2k
views
Travel Times for Seismic Wave Types - Why reflected t-x plot curves
I do not understand how the reflected wave in a seismic survey has a steepening slope (slows down) Please bear with me as I lay out my thoughts because I feel like I can grasp all of this except this ...
- 303
7
votes
1
answer
2k
views
What is the meaning of seismic spectral blueing?
What is the meaning of seismic spectral blueing? Please cite any good introductory materials if possible.
- 823
10
votes
1
answer
3k
views
How does one determine the optimum offset in a seismic survey?
I was going through a report on MASW (Multi Station Analysis of Surface Wave) and found this
"To avoid the aliasing in the space domain, geophone spacing (Δx) needs to be less than half of the ...
- 1,489
8
votes
3
answers
1k
views
Why do deviated wells show poor correlation to seismic data?
Well correlation and calibration is an important step in any type of seismic inversion. In order to obtain a good broadband frequency model, the synthetics should be correlated with original seismic ...
- 823
12
votes
1
answer
2k
views
Should one extract wavelet from seismic or well log for the generation of synthetic traces?
Synthetics are generated by convolving reflectivity series with the known wavelet. I have seen most of the wavelet are extracted from seismic data itself. Is there any hard and fast rule, or can one ...
- 823
13
votes
1
answer
7k
views
P wave to S wave conversion
While passing through layers inside the earth some P waves get converted to S waves and then back to P waves while returning towards the surface. Is this statement true?
If yes, then why? (...
- 131
14
votes
2
answers
740
views
Why is a seismogram interpreted as a convolution?
I remember reading in a geology book that a seismogram is a convolution between a source signal and propagation effects. In layman's terms, what does this really mean?
- 1,151
23
votes
3
answers
13k
views
How to distinguish P, S, Love, and Rayleigh waves in a seismogram?
What features should I look for to determine each of these kinds of waves in a seismogram? What signal processing methods (filters, transforms, etc...) should I use to determine them?
- 1,151
12
votes
3
answers
1k
views
How do Rossby Waves in the ocean form?
So on land, I believe that one factor in their formation is due to inhomogeneities in surface heating between land and ocean (and also inhomogeneities in surface heating due to terrain effects like ...
- 7,827