Joanna Holmgren (U. Bristol), me, and Max Werner (U. Bristol) published a study related to analysis of induced seismicity associated with 2018 hydraulic stimulation campaign performed within St1 Deep Heat project in Helsinki, Finland: “Nonsystematic Rupture Directivity of Geothermal Energy Induced Microseismicity in Helsinki, Finland“. Joanna used spectral division technique to resolve the rupture directivity and rupture velocity of small earthquakes. We found earthquake ruptured predominantly parallel to the well as mode II failures, and provided new constraints for models of rupture growth. The study is open-access.
Reference:
Holmgren, J. M., G. Kwiatek, and M. J. Werner (2023). Nonsystematic Rupture Directivity of Geothermal Energy Induced Microseismicity in Helsinki, Finland, Journal of Geophysical Research: Solid Earth 128, no. 3, e2022JB025226, DOI: 10.1029/2022JB025226. [ Article Page ] [ Download open-access article ] [ Link to data publication ]