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| Titel |
Source-Receiver Interferometry and the Link to Imaging |
| VerfasserIn |
Andrew Curtis, David Halliday |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250044203
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| Zusammenfassung |
| In conventional seismic interferometry, noise or impulsive-source wavefields recorded at a pair of receivers are correlated, convolved, or deconvolved in ways that produce estimates of the inter-receiver Green’s function – the signal that would be recorded at one receiver if the other had been a source. Thus one receiver is converted into a ‘virtual’ source. Recently it was shown that recordings from a pair of energy sources at a network of receivers can be combined similarly to convert one source into a virtual receiver that records real energy from the other source; in a previous paper we used this to create a virtual strain seismometer deep in the Earth from a real earthquake source. We now derive the third possible geometrical form of interferometry, that can be applied between a source-receiver pair: this turns a real source and real receiver into a virtual receiver and virtual source, respectively, and requires a double-focussing operation. While this is useful in itself for analysing source-receiver surface waves, we show that by perturbing the medium in source-receiver interferomtry the method can also be directly converted into the double-focussing operation commonly used in seismic imaging or migration. Thus
we create a direct and intuitive link between interferometry and imaging/migration theory. |
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