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| Titel |
Time reversal in heterogeneous solid half-spaces |
| VerfasserIn |
Yingzi Ying, Chris Bean, Ivan Lokmer |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250079668
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| Zusammenfassung |
| The heterogeneities of elastic properties in the Earth’s interior exist over all scales. Seismic
waves propagating through heterogeneous media are scattered thus the waveforms are
distorted. Consequently, our ability to image the source is compromised. Time reversal
technique can utilize the reciprocity of linear elastodynamics and can be applied effectively in
heterogeneous media. In this work, the refocusing properties of time reversal wave fields in
heterogeneous solid half-spaces are investigated numerically. Here the 3D numerical
simulations are performed with a spectral-element method by using open-source software
package SPECFEM3D. The simulation results indicate that in the regime where the
heterogeneous scale is of the order of the dominant seismic wavelength, the refocusing fields
become statistical stable that they are independent of the particular realizations of
random fields. Furthermore, the super-resolution phenomenon is also observed as
the width of focal spot can transcend the diffraction limit, i.e., the effective array
aperture is increased due to the multi-pathing and multi-scattering effects caused by
heterogeneities. |
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