Source mechanism of kHz microseismic events recorded in multiple boreholes at the first EGS Collab testbed

dc.citation.articleNumber102994en_US
dc.citation.journalTitleGeothermicsen_US
dc.citation.volumeNumber120en_US
dc.contributor.authorQin, Yanen_US
dc.contributor.authorLi, Jiaxuanen_US
dc.contributor.authorHuang, Lianjieen_US
dc.contributor.authorSchoenball, Martinen_US
dc.contributor.authorAjo-Franklin, Jonathanen_US
dc.contributor.authorBlankenship, Douglasen_US
dc.contributor.authorKneafsey, Timothy J.en_US
dc.contributor.authorEGS Collab Teamen_US
dc.date.accessioned2024-10-08T13:27:47Zen_US
dc.date.available2024-10-08T13:27:47Zen_US
dc.date.issued2024en_US
dc.description.abstractContinuous microseismic monitoring using three-component (3C) accelerometers deployed in multiple boreholes allows for tracking the detailed evaluation of mesoscale (∼10 m scale) fracture growth during the fracture stimulation experiments at the first Enhanced Geothermal Systems (EGS) Collab testbed. Building on a well-constrained microseismic event catalog, we invert for moment tensor of the events to better understand the fracture geometry and stress orientations. However, it is challenging because of the unknown orientation of 3C accelerometers and low signal-to-noise-ratio nature of high-frequency (several kHz) monitoring. To address these challenges, we first perform the hodogram analysis on the continuous active-source seismic monitoring (CASSM) data to determine the orientations of the 18 3C accelerometers. We then apply the principal component analysis (PCA) to the observed microseismic waveforms to improve the signal-to-noise ratios. We perform a grid search for the full moment tensor by fitting the PCA-denoised waveforms at a frequency range of 5 to 8 kHz. The moment tensor results show both the creation of hydraulic fractures and the reactivation of natural fractures during the hydraulic stimulations. Our stress inversion based on the inverted moment tensors reveals the alteration of stress regime caused by hydraulic fracture stimulations.en_US
dc.identifier.citationQin, Y., Li, J., Huang, L., Schoenball, M., Ajo-Franklin, J., Blankenship, D., & Kneafsey, T. J., EGS Collab Team (2024). Source mechanism of kHz microseismic events recorded in multiple boreholes at the first EGS Collab testbed. Geothermics, 120, 102994. https://doi.org/10.1016/j.geothermics.2024.102994en_US
dc.identifier.digital1-s2-0-S037565052400083X-mainen_US
dc.identifier.doihttps://doi.org/10.1016/j.geothermics.2024.102994en_US
dc.identifier.urihttps://hdl.handle.net/1911/117910en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives (CC BY-NC-ND) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.titleSource mechanism of kHz microseismic events recorded in multiple boreholes at the first EGS Collab testbeden_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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