Monitoring<i>in situ</i>stress changes in a mining environment with coda wave interferometry

Grêt, Alexandre; Snieder, Roel; Ozbay, U.

doi:10.1111/j.1365-246x.2006.03097.x

Cited by 56 publications

(37 citation statements)

References 41 publications

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“…The increased barometric loads serve to close cracks, consequently resulting in a net reduction of crack density and increasing seismic velocity along the wave propagation path, which provides a reasonable explanation for our observations. Seismic velocities can also be strongly influenced by fluid saturation (Grêt et al 2006). Based on the theory of O' Connell and Budiansky (1974), for a medium with penny shaped cracks, seismic velocity changes non-linearly with both crack density and saturation fraction.…”

Section: Discussionmentioning

confidence: 99%

Semiannual velocity variations around the 2008 Mw 7.9 Wenchuan Earthquake fault zone revealed by ambient noise and ACROSS active source data

Chen

Niu

2014

Earthq Sci

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We continuously monitor the long-term seismic velocity variation of one of the major ruptured faults of the devastating 2008 M w 7.using accurately controlled routinely operated signal system active source and seismic noise-based monitoring technique. Our measurements show that the temporal velocity change is not homogeneous and highly localized in the damaged fault zone and the adjacent areas. Velocity variations from the active and passive methods are quite consistent, which both are characterized by ±0.2 % seasonal variation, with peak and trough at winter and summer, respectively. The periodic velocity variation within fault zone exhibits remarkably positive correlation with barometric pressure with stress sensitivity in the order of 10 -6 Pa -1 , suggesting that the plausible mechanism might be the crack density variation of the shallow subsurface medium of the damaged fault zone in response to the cyclic barometric pressure loading.

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Section: Discussionmentioning

confidence: 99%

Semiannual velocity variations around the 2008 Mw 7.9 Wenchuan Earthquake fault zone revealed by ambient noise and ACROSS active source data

Chen

Niu

2014

Earthq Sci

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“…than are the first arrivals of seismic waves (Grêt, 2004;Grêt et al, 2006). The decrease in the estimated value of Q c at depth of ∼78 km may be related to a change in the elastic properties of the region.…”

Section: Attenuation Variation With Depthmentioning

confidence: 93%

Estimation of Coda‐Wave Attenuation in the Central and Eastern Alborz, Iran

Farrokhi¹,

Hamzehloo²,

Rahimi³

et al. 2015

Bulletin of the Seismological Society of America

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The quality factor of coda (Q c ) waves has been estimated by using single backscattering and single isotropic scattering models. The earthquakes used were recorded by three permanent and one temporary network located in the central and eastern Alborz, Iran. The database was composed of 746 local earthquakes with local magnitude from 1.1 to 5.7. The estimated Q c has been found to be similar for lapse times greater than twice the S-wave travel time (2t S ) for both methods.The estimated Q c for central frequencies < 1:0 Hz shows less frequency dependency compared with the higher frequencies. By using a Q 0 f n relation, the average frequency dependence of Q c for the whole area has been estimated as 59f 1:03 , 69f 0:97 , 78f 0:97 , 105f 0:93 , 123f 0:89 , 159f 0:79 , and 203f 0:68 for central lapse times 30, 40, 50, 65, 85, 110, and 155 s, respectively. We found the value of Q 0 decreases at an average depth of 78 km, which may be the result of high dissipating media at this depth. The average Q c values, estimated for central and eastern Alborz and their frequencydependent relationships are similar to those of tectonically active regions.

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“…On the other hand, it is now well known that even very complex propagation signals contain useful information on the traveled medium. Recent research trends have indeed focused on retrieving information or performing imaging from complex propagation, and powerful techniques developed on this purpose such as time-reversal acoustics, 1 field correlation, [2][3][4] or diffusing acoustic wave spectroscopy 5,6 are still the topic of intensive current research in physical acoustics.…”

Section: Introductionmentioning

confidence: 99%

Extraction of statistical properties of the point source response of a reverberant plate and application to parameter estimation (L)

Moulin

Achdjian

Assaad

et al. 2012

The Journal of the Acoustical Society of America

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The point source response of a reverberant solid plate is modeled through a nonstationary Poisson process based on the image-source method. The theoretical expectation of the envelope is then derived, taking into account the dispersive nature of plate waves, and validated by numerical results. Least-square curve-fitting applied to an ensemble average over N realizations can then be used to identify useful parameters such as wave velocity, plate surface, or source-receiver distance. It is shown that even values of N down to 1 (no averaging) allow a satisfying identification. Application to the estimation of the source-receiver distance using a single sensor is finally highlighted to illustrate the promising potentialities of the measurement principle proposed.

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Monitoringin situstress changes in a mining environment with coda wave interferometry

Cited by 56 publications

References 41 publications

Semiannual velocity variations around the 2008 Mw 7.9 Wenchuan Earthquake fault zone revealed by ambient noise and ACROSS active source data

Semiannual velocity variations around the 2008 Mw 7.9 Wenchuan Earthquake fault zone revealed by ambient noise and ACROSS active source data

Estimation of Coda‐Wave Attenuation in the Central and Eastern Alborz, Iran

Extraction of statistical properties of the point source response of a reverberant plate and application to parameter estimation (L)

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