In this paper,a template matching and location method,which has been rapidly adopted in microseismic research in recent years,is applied to laboratory acoustic emission(AE)monitoring.First,we used traditional methods to detect P-wave first motions and locate AE hypocenters in three dimensions.In addition,we selected events located with sufficient accuracy(normally corresponding AE events of relatively larger energy,showing clear P-wave first motion and a higher signal-to-noise ratio in most channels)as template events.Then,the template events were used to scan and match other poorly located events in triggered event records or weak events in continuous records.Through cross-correlation of the multi-channel waveforms between the template and the event to be detected,the weak signal was detected and located using a grid-searching algorithm(with the grid centered at the template hypocenter).In order to examine the performance of the approach,we calibrated the proposed method using experimental data of different rocks and different types of experiments.The results show that the proposed method can significantly improve the detection capability and location accuracy,and can be applied to various laboratory and in situ experiments,which use multi-channel AE monitoring with waveforms recorded in either triggering or continuous mode.

Xinglin Lei;Tomohiro Ohuchi;Manami Kitamura;Xiaying Li;Qi Li

National Institute of Advanced Industrial Science and Technology(AIST),Tsukuba,305-8567,Japan;Geodynamics Research Center,Ehime University,Matsuyama,790-8577,Japan;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,430071,China;University of Chinese Academy of Sciences,Beijing,100049,China

岩石力学与岩土工程学报（英文版）

[1]Xinglin Lei;Tomohiro Ohuchi;Manami Kitamura;Xiaying Li;Qi Li-.An effective method for laboratory acoustic emission detection and location using template matching)[J].岩石力学与岩土工程学报（英文版）,2022(05):1642-1651

hypocenters

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