Seismic time reversal mirror: Field experiment

A. Yurman*, E. Landa

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Time Reversal Mirror (TRM) is a physical process which refocuses recorded waves into their initial source location. We demonstrate how seismic P-wave is successfully focused back to its original location in a 3D field experiment. The method does not require a-priori knowledge of seismic velocities in the medium for re-focusing to occur. We further examine the observed focusing resolution of the back propagated wavefield by quantitative comparison to acoustic numerical modeling. As in any TRM process, the experiment includes two stages: in the first stage the seismic wave is generated by a sub-surface point source and recorded by a 3D surface array (the mirror). In the second stage, we activate a vibrator, based on a linear synchronous motor (LSM) to re-emit the time-reversed signals from the original receiver positions. As opposed to standard hydraulic-based seismic vibrators, the LSM-based vibrator enables generation of arbitrary seismic signals, efficiently acting as a reversal mirror. We record the re-emitted wavefield at sub-surface locations, near and at the original source location. Both real and modeled data focus the re-emitted data within the theoretical range of half the dominant wavelength, validating the TRM experimental results. Various applications of the TRM in seismic are considered.

Original languageEnglish
Title of host publication81st EAGE Conference and Exhibition 2019
PublisherEAGE Publishing BV
ISBN (Electronic)9789462822894
DOIs
StatePublished - 3 Jun 2019
Event81st EAGE Conference and Exhibition 2019 - London, United Kingdom
Duration: 3 Jun 20196 Jun 2019

Publication series

Name81st EAGE Conference and Exhibition 2019

Conference

Conference81st EAGE Conference and Exhibition 2019
Country/TerritoryUnited Kingdom
CityLondon
Period3/06/196/06/19

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