Source Parameters of Laboratory Acoustic Emission Events Estimated From the Coda of Waveforms

Kartseva, T.; Shapiro, N.; Patonin, A.; Shikhova, N.; Smirnov, V.; Ponomarev, A.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 4 июля 2024 г.

Авторы: Kartseva TI, Shapiro NM, Patonin AV, Shikhova NM, Smirnov VB, Ponomarev AV
Журнал: JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Том: 129
Номер: e2023JB028313
Год издания: 2024
Первая страница: 1
Последняя страница: 19
Номер статьи: e2023JB028313
DOI: 10.1029/2023JB028313
Аннотация: We develop a method to estimate relative seismic moments M0 and corner frequencies fc ofacoustic emission events recorded in laboratory experiments from amplitude spectra of signal's coda composedof reverberated and scattered waves. This approach has several advantages with respect to estimations fromdirect waves that are often clipped and also are difficult to separate in experiments performed on small samples.Also, inversion of the coda spectra does not require information about the source locations and mechanisms. Weuse the developed method to analyze the data of two experiments: (a) on granite from the Voronezh crystalmassif and (b) on Berea sandstone. The range of absolute corner frequencies estimated in both experiments isaround 70 􀀀 􀀀 700 kHz. The range of relative seismic moments covers 103.5. The relation between fc and M0observed on the first stages of both experiments, consisted of increasing isotropic confining pressure,approximately follow M0 ∼ f 􀀀 3c scaling and the b‐value of the Gutenberg‐Richter distribution was found closeto 1. This can be interpreted as rupturing of preexisting material defects with a nearly constant stress‐drop andhas a similarity with observations of “natural” earthquakes. Deviations from this “earthquake‐like” behaviorobserved after applying axial loading and initiation of sample damaging can be interpreted as changes in stressdrop.Lower stress‐drops prevail for sandstone and higher for granite sample respectively that can be related tothe strength of corresponding material.
Добавил в систему: Смирнов Владимир Борисович

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Source Parameters of Laboratory Acoustic Emission Events Estimated From the Coda of Waveformsстатья

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