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

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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Induced Microseismic Event with Strong Rupture Directivity and Superimposed Attenuation Effects

Wcisło

Staněk

Gallovič

et al. 2023

Seismological Research Letters

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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

Cited by 1 publication

References 20 publications

Induced Microseismic Event with Strong Rupture Directivity and Superimposed Attenuation Effects

Induced Microseismic Event with Strong Rupture Directivity and Superimposed Attenuation Effects

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