Mechanisms of hydraulic fracturing induced seismicity inferred from seismic tomography
About the Event:
In recent years, small and moderate earthquakes induced by subsurface fluid injection have been reported worldwide. Two most conspicuous regions with a large number of induced earthquakes are mid-eastern United States and western Canada, which have a long history of wastewater disposal, enhanced oil recovery and shale gas hydraulic fracturing. In general, there are two mechanisms that are used to explain the induced seismicity due to hydraulic fracturing. The first mechanism is the activation of pre-existing faults caused by fluid diffusion, and the second one is due to the poroelastic effect of rock matrix. In this talk, two case studies in eastern China and western Canada will be presented. Earthquake relocation and seismic tomography results shown that fluid diffusion and fault activation is most likely to be the mechanisms of induced seismicity in these areas.
About the Speaker:
Yukuan Chen received his B.Sc. (2013) and Ph.D (2019) in Geophysics from the University of Science and Technology of China. During his Ph.D study, He worked in the University of Calgary for one year as a visiting student. His research mainly focuses on developing novel methods to retrieve spatial and temporal seismic velocity changes induced by hydraulic fracturing.