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Spatial-temporal evolution of injection-induced earthquakes in the weiyuan Area determined by machine-learning phase picker and waveform cross-correlation

引用

Earth and Planetary Physics 2021年第6期5卷 485-500页

作者： Wing Ching Jeremy Wong JinPing Zi HongFeng Yang JinRong Su Earth System Science Programme Faculty of ScienceThe Chinese University of Hong KongSha TinHong Kong 999077China earthquake Monitoring Center Sichuan Earthquake AgencyChengdu 610041China

Anthropogenic induced seismicity has been widely reported and investigated in many regions,including the shale gas fields in the Sichuan basin,where the frequency of earthquakes has increased substantially since the commencement of fracking in late 2014.However,the details of how earthquakes are induced remain poorly understood,partly due to lack of high-resolution spatial-temporal data documenting the evolution of such seismic events.Most previous studies have been based on a diffusive earthquake catalog constructed by routine methods.Here,however,we have constructed a high resolution catalog using a machine learning detector and waveform cross-correlation.Despite limited data,this new approach has detected one-third more earthquakes and improves the magnitude completeness of the catalog,illuminating the comprehensive spatial-temporal migration of the emerging seismicity in the target area.One of the clusters clearly delineates a potential unmapped fault trace that may have led to the Mw 5.2 in September 2019,by far the largest earthquake recorded in the region.The migration of the seismicity also demonstrates a pore-pressure diffusion front,suggesting additional constraints on the inducing mechanism of the region.The patterns of the highly clustered seismicity reconcile the causal link between the emerging seismicity and the activity of hydraulic fracturing in the region,facilitating continued investigation of the mechanisms of seismic induction and their associated risks.

关键词： hydraulic fracturing Sichuan Basin machine learning injection-induced earthquake weiyuan earthquake

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