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Towards Numerical Modelling of Triggered and Induced Seismicity
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Fifth EAGE Passive Seismic Workshop, Sep 2014, Volume 2014, p.1 - 5
Abstract
Human-induced earthquakes are more and more brought into the focus of public attention. E. g. Ellsworth (2013) attracts notice to the dramatic increase of the number of earthquakes in the central and eastern United States over the past few years. Environments prone to induce or trigger seismicity are numerous, e. g. oil and gas exploration sites, large-scale surface quarries and mines, Enhanced Geothermal Systems (EGS), dam sites and injections of e.g. CO2 or waste water. Since the nature of induced and triggered earthquakes implies their occurrence near engineering activity, even earthquakes of small magnitude are a cause for concern. We present several numerical methods to enhance the understanding of the spatial and temporal occurrence of seismicity, which has been triggered or induced by human operations: a) poroelastic modelling employing elementary Green’s functions, b) analytical fracture model combined with a rate- and state- dependent constitutive model and c) a 3D FEM able to handle both heterogeneous rocks and branched fractures.