Reply to “The peak frequency of direct waves for microseismic events” (Leo Eisner, Davide Gei, Miroslav Hallo, Ivo Opršal, and Mohammed Y. Ali, G<scp>eophysics</scp>, 78, no. 6, A45–A49)

Eisner, Leo; Gei, Davide; Hallo, Miroslav; Oprsal, Ivo; Ali, Mohammed Y.

doi:10.1190/2014-0053.2

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…In the downhole monitoring dataset the peak frequency method provides less scattered results. Such benchmarking also indicates that the model of the source spectra of microseismic events is well explaining the observation as discussed in Eisner et al (2013) and Eisner et al (2014). The quality factors inverted using the peak frequency method have consistent values for most of the investigated microseismic events indicating robustness of the technique.…”

Section: Discussionmentioning

confidence: 55%

“…However, Morozov (2014) questioned applicability of such a method to microseismic monitoring suggesting the observed peak frequencies result from near-surface structures or source reverberations. Eisner et al (2014) provided further justification for the proposed method. This study shows that the peak frequency method can be used also for downhole monitoring arrays (where nearsurface layers do not play any role) and benchmarks results of the peak frequency method with the spectral ratio technique.…”

Section: Introductionmentioning

confidence: 98%

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Attenuation from microseismic datasets by the peak frequency method benchmarked with the spectral ratio method

Wcisło

Eisner

2016

Stud Geophys Geod

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Recently proposed peak-frequency method is used to estimate the P-and S-wave quality factors from microseismic events. We use a downhole monitoring dataset of 10 high signal-to-noise ratio microseismic events to calculate P-and S-wave effective attenuation of a carbonate reservoir. We benchmark these results with the spectral ratio method and obtain mutually consistent results. Additionally we develop and test two techniques of peak frequency determination. We show that the peak frequency method can be successfully used in the estimation of the quality factor and it provides precise measurements of attenuation.K e y w o r d s : attenuation, microseismicity, inversion, ray tracing

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Section: Discussionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 98%

Attenuation from microseismic datasets by the peak frequency method benchmarked with the spectral ratio method

Wcisło

Eisner

2016

Stud Geophys Geod

Self Cite

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Reply to “Comment on ‘Attenuation in West Bohemia: Evidence of High Attenuation in the Nový Kostel Focal Zone and Temporal Change Consistent with CO2 Degassing’ by M. Wcisło, L. Eisner, J. Málek, T. Fischer, J. Vlček, and G. Kletetschka” by Morozov

Wcisło

Eisner²,

Málek

et al. 2020

Bulletin of the Seismological Society of America

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Induced Microseismic Event with Strong Rupture Directivity and Superimposed Attenuation Effects

Wcisło

Staněk

Gallovič

et al. 2023

Seismological Research Letters

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Rupture directivity is a fundamental effect well known mainly for large natural earthquakes. Its observation for microseismic events is difficult due to small rupture size and short duration, usually insufficient coverage of monitoring array and attenuation along wave propagation paths. Here, we detect the rupture directivity for an induced microseismic event (Mw∼1.2) recorded by a dense surface starlike array during hydraulic fracturing of a shale reservoir in China. We use durations of initial P-wave arrivals as a proxy to peak frequency content. The observed directional and offset dependence of the peak frequencies can be explained by superimposed effects of the rupture directivity of fast, possibly supershear rupture propagation and attenuation, permitting the determination of the event’s fault plane orientation. Furthermore, we implement a simple statistical correction to the amplitudes, proving the inverted source mechanism to be stable, only with a slightly lower, yet unreliable nonshear component.

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Reply to “The peak frequency of direct waves for microseismic events” (Leo Eisner, Davide Gei, Miroslav Hallo, Ivo Opršal, and Mohammed Y. Ali, Geophysics, 78, no. 6, A45–A49)

Cited by 3 publications

References 14 publications

Attenuation from microseismic datasets by the peak frequency method benchmarked with the spectral ratio method

Attenuation from microseismic datasets by the peak frequency method benchmarked with the spectral ratio method

Reply to “Comment on ‘Attenuation in West Bohemia: Evidence of High Attenuation in the Nový Kostel Focal Zone and Temporal Change Consistent with CO2 Degassing’ by M. Wcisło, L. Eisner, J. Málek, T. Fischer, J. Vlček, and G. Kletetschka” by Morozov

Induced Microseismic Event with Strong Rupture Directivity and Superimposed Attenuation Effects

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