on the relation between codas in seismic reflection and transmission responses kees wapenaar deyan...
TRANSCRIPT
On the relation between codas in seismic reflection and transmission
responses
Kees WapenaarDeyan DraganovJan Thorbecke
Delft University of Technology
• Review for horizontally layered media
• Generalization for 3-D inhomogeneous media
• Conclusions
Constant
Power-flux conservation:
D U
Top:
Bottom:
D=T, U=0
Constant
Power-flux conservation:
In time domain:
In time domain:
(Claerbout, 1968)
In time domain:
(Claerbout, 1968)
Transmission response Reflection response
• Review for horizontally layered media
• Generalization for 3-D inhomogeneous media
• Conclusions
Claerbout’s conjecture:
‘‘By cross-correlating noise traces recorded at two locations on the surface, we can construct the wave field that would be recorded at one of the locations if there was a source at the other’’
Constant
Power-flux conservation:
D U
Power reciprocity:
DB UA UBDA D U
Constant
Top:
Top:
Top:
Bottom:
Power reciprocity:
Constant
In time-domain:
i
t
Syncline model
Transmission response (fixed , variable )x Ax
Causal part of
Directly modeled reflection response
i
t
Transmission response observed at the surface from white noise sources in the subsurface
Simulated reflection response with coda10 min long recording 66 min long recording
Syncline model with reflector below the sourcesand its simulated reflection response
ghost
reflector
Syncline model with reflector below the sourcesand its simulated reflection response
ghost
reflector
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Structural trends in the subsurface of the Netherlands,with recent sources of seismicity (white circles) and contours of constant depth of the Mohorovic discontinuity (Beekman and Stephenson).
25% of antennas in central core
High speed data transport
Antenna cluster (Station)
Central processor
X
Share infrastructure withsynthetic radio-telescope
Combined monitoring the universe and the subsurface:Different applications; shared infrastructure
Shared infrastructure
1 3 0 0 0 D a ta F a b ric s
o n-line hyb rid d ata p ro c es s ing c lus terU s er p o s t p ro c es s ing
D ata P ro c es s ing P lant
C o ntro l C enter(s )
• Review for horizontally layered media
• Generalization for 3-D inhomogeneous media
• Conclusions
Constant
Power-flux conservation:
D U
Power reciprocity:
DB UA UBDA D U
Constant
DB UA UBDA D U
Constant
Constant DAUB - UADB
Applications:
Generate reflection response from passive transmission measurements
More applications: see http://www.ta.tudelft.nl/PrivatePages/C.P.A.Wapenaar/Daylight/coda_gji.pdf