Fault slip tendacy analysis for a deep-sea basalt CO₂, injection in the Cascadia Basin




Johnson, Eneanwan Ekpo
Scherwath, Martin
Moran, Kate
Dosso, Stan E.
Rohr, Kristin M.

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Offshore basalts, most commonly found as oceanic crust formed at mid-ocean ridges, are estimated to offer an almost unlimited reservoir for CO₂ sequestration and are regarded as one of the most durable locations for carbon sequestration since injected CO₂ will mineralize, forming carbonate rock. As part of the Solid Carbon project, the potential of the Cascadia Basin, about 200 km off the west coast of Vancouver Island, Canada, is investigated as a site for geological CO₂ sequestration. In anticipation of a demonstration proposed to take place, it is essential to assess the tendency of geologic faults in the area to slip in the presence of CO₂ injection, potentially causing seismic events. To understand the viability of the reservoir, a quantitative risk assessment of the proposed site area was conducted. This involved a detailed characterization of the proposed injection site to understand baseline stress and pressure conditions and identify individual faults or fault zones with the potential to slip and thereby generate seismicity. The results indicate that fault slip potential is minimal (less than 1%) for a constant injection of up to ~2.5 MT/yr. This is in part due to the thickness of the basalt aquifer and its permeability. The results provide a reference for assessing the potential earthquake risk from CO₂ injection in similar ocean basalt basins.



risk assessment, modelling, fault slip potential, induced seismicity, solid carbon project, geomechanics


Ekpo Johnson, E., Scherwath, M., Moran, K., Dosso, S. E., & Rohr, K. M. (2023). Fault slip tendency analysis for a deep-sea basalt CO₂ injection in the Cascadia Basin. GeoHazards, 4(2), 121–135. https://doi.org/10.3390/geohazards4020008