On the relation between codas in seismic reflection and transmission responses Kees Wapenaar Deyan Draganov Jan Thorbecke Delft University of Technology.

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Presentation transcript:

On the relation between codas in seismic reflection and transmission responses Kees Wapenaar Deyan Draganov Jan Thorbecke Delft University of Technology

Review for horizontally layered media Generalization for 3-D inhomogeneous media Conclusions

Constant Power-flux conservation: DU

Top:

Bottom: D=T, U=0

Constant Power-flux conservation:

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: DU

Power reciprocity: DBDB U A U B DADA DU Constant

Top:

Bottom:

Power reciprocity: Constant

In time-domain: i t

Syncline model

Transmission response (fixed, variable )

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 coda 10 min long recording66 min long recording

Syncline model with reflector below the sources and its simulated reflection response ghost reflector

Syncline model with reflector below the sources and its simulated reflection response ghost reflector

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 with synthetic radio-telescope

Combined monitoring the universe and the subsurface: Different applications; shared infrastructure

Shared infrastructure

Review for horizontally layered media Generalization for 3-D inhomogeneous media Conclusions

Constant Power-flux conservation: DU

Power reciprocity: DBDB U A U B DADA DU Constant

DBDB U A U B DADA DU Constant D A U B - U A D B

Applications: Generate reflection response from passive transmission measurements More applications: see C.P.A.Wapenaar/Daylight/coda_gji.pdf