Experimentally identifying masked sources applying time reversal with the selective source reduction method

Anderson, Brian E.; Ulrich, Timothy J.; Griffa, Michele; Bas, Pierre‐Yves Le; Scalerandi, Marco; Gliozzi, Antonio; Johnson, P. A.

doi:10.1063/1.3079517

Cited by 11 publications

(7 citation statements)

References 40 publications

(40 reference statements)

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“…Backprojection images do not yield actual slip distributions or moment estimates because they do not quantitatively account for the Green's function influences on seismic wave energy partitioning, but they can provide overall characterization of source finiteness that may influence parameterization of finite-source modeling. There are some similarities with time-reversal imaging approaches (e.g., Larmat et al, 2006;Kawakatsu and Montagner, 2008;Anderson et al, 2009), but P wave back projections assume simple optical travel time effects and do not account for propagation losses. S wave back projections are not attempted due to the large path travel time anomalies that create difficulty in phase alignment.…”

Section: Back-projection Images Of the Source Rupture Historymentioning

confidence: 99%

Effects of Kinematic Constraints on Teleseismic Finite-Source Rupture Inversions: Great Peruvian Earthquakes of 23 June 2001 and 15 August 2007

Lay¹,

Ammon²,

Hutko³

et al. 2010

Bulletin of the Seismological Society of America

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Two great underthrusting earthquakes that occurred along the coast of Peru in 2001 and 2007 involve spatiotemporal slip distributions that differ from the predominantly unilateral or bilateral rupture expansion of many great events. Commonly used finite-source rupture model parameterizations, with specified rupture velocity and/or short duration of slip at each grid point applied to the seismic data for these two events, lead to incorrect slip-distributions or inaccurate estimation of rupture velocities as a result of intrinsic kinematic constraints imposed on the model slip distributions. Guided by large aperture array back projections of teleseismic broadband P-wave signals that image slip locations without imposing a priori kinematic constraints on the rupture process, we exploit the availability of large global broadband body and surface wave data sets to consider the effects of varying the kinematic constraints in teleseismic finite-source waveform inversions. By allowing longer than usual rupture durations at each point on the fault using a flexible subfault source-time function parameterization, we find that the anomalous attributes of the 2001 and 2007 Peru earthquake ruptures are readily recognized and accounted for by compound rupture models. The great 23 June 2001 (M w 8:4) earthquake involved an initial modestsize event that appears to have triggered a much larger secondary event about 120 km away that developed an overall slip distribution with significant slip located back along the megathrust in the vicinity of the initial rupture. The great 15 August 2007 (M w 8:0) earthquake was also a composite event, with a modest size initial rupture followed by a 60-sec delayed larger rupture that initiated ∼50-60 km away and spread up-dip and bilaterally. When back projections indicate greater rupture complexity than captured in a simple slip-pulse-type rupture model, one should allow for possible long-subfault slip-duration or composite triggered sequences, and not overly constrain the earthquake slip distribution.

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Section: Back-projection Images Of the Source Rupture Historymentioning

confidence: 99%

Effects of Kinematic Constraints on Teleseismic Finite-Source Rupture Inversions: Great Peruvian Earthquakes of 23 June 2001 and 15 August 2007

Lay¹,

Ammon²,

Hutko³

et al. 2010

Bulletin of the Seismological Society of America

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“…Selective focusing is achieved by the decomposition of the TR operator and requires an array of transmitting-receiving transducers. Another procedure is suggested by Anderson et al [31] and is adopted in the method presented. Fig.…”

Section: Unveiling Small Scatterersmentioning

confidence: 99%

Quantitative guided wave testing by applying the time reversal principle on dispersive waves in beams

Ernst

Dual

2015

Wave Motion

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“…When dealing with several sources, we propose to use an automatic iterative process, inspired by recent works. 38,39 The main idea consists in automatically defining as many sinks as real sources exist in the volume delimited by the hemispherical array. Hence, it is necessary to a priori know the number of sources which are radiating to identify their position.…”

Section: E Synthetic Trs: a Step Toward Perfect Tr Imagingmentioning

confidence: 99%

Hemispherical double-layer time reversal imaging in reverberant and noisy environments at audible frequencies

Lobréau¹,

Bavu²,

Melon³

2015

The Journal of the Acoustical Society of America

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Time reversal is a widely used technique in wave physics, for both imaging purposes and experimental focusing. In this paper, a complete double-layer time reversal imaging process is proposed for in situ acoustic characterization of non-stationary sources, with perturbative noise sources and reverberation. The proposed method involves the use of a hemispherical array composed of pressure-pressure probes. The complete set of underlying optimizations to sonic time reversal imaging is detailed, with regard to space and time reconstruction accuracy, imaging resolution and sensitivity to reverberation, and perturbative noise. The proposed technique is tested and compared to more conventional time reversal techniques through numerical simulations and experiments. Results demonstrate the ability of the proposed method to back-propagate acoustic waves radiated from non-stationary sources in the volume delimited by the measurement array with a high precision both in time and space domains. Analysis of the results also shows that the process can successfully be applied in strongly reverberant environments, even with poor signal-to-noise ratio.

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Experimentally identifying masked sources applying time reversal with the selective source reduction method

Cited by 11 publications

References 40 publications

Effects of Kinematic Constraints on Teleseismic Finite-Source Rupture Inversions: Great Peruvian Earthquakes of 23 June 2001 and 15 August 2007

Effects of Kinematic Constraints on Teleseismic Finite-Source Rupture Inversions: Great Peruvian Earthquakes of 23 June 2001 and 15 August 2007

Quantitative guided wave testing by applying the time reversal principle on dispersive waves in beams

Hemispherical double-layer time reversal imaging in reverberant and noisy environments at audible frequencies

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