Wave-focusing to subsurface targets using a switching time-reversal mirror

Seungbum Koo, Heedong Goh, Loukas F. Kallivokas

Research output: Contribution to journalArticlepeer-review


The need for wave energy focusing to selected targets embedded within a host is commonly shared among various engineering fields, whether for stimulation and imaging in exploration geophysics, or for contaminant removal in geo-environmental engineering, or even for diagnostic/therapeutic purposes in medicine. In this paper, we are concerned with the feasibility of focusing wave energy to multiple subsurface targets embedded within a semi-infinite heterogeneous elastic host, by exploiting the time-reversibility of the lossless wave equation under adverse conditions for time reversal. Of particular interest for practical applications in geophysics is the need for a switching time-reversing mirror, where recorded Dirichlet data must be time-reversed as Neumann data due to equipment constraints. In the absence of theoretical guarantees, we turn to numerical experiments and report that wave-focusing can be indeed realized, despite various departures from the theoretically ideal time reversal case.
Original languageEnglish (US)
Pages (from-to)107736
JournalSoil Dynamics and Earthquake Engineering
StatePublished - Dec 31 2022
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2023-03-06
Acknowledgements: The authors’ work was partially supported by an Academic Alliance Excellence grant between the King Abdullah University of Science and Technology in Saudi Arabia (KAUST) and the University of Texas at Austin, United States. The support is gratefully acknowledged.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Civil and Structural Engineering
  • Soil Science


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