Poroelastic response around an intrusion

The pore pressure field induced around a cylindrical intrusion is described as an analogue to a moving point dislocation within an infinite saturated porous elastic solid. Dimensionless pressure rise accompanying intrusion, and recorded at a static location, may be uniquely referenced to the dimension less parameters representing emplacement velocity and time. The resulting pressure transient response may be divided between two groups, representing fast and slow emplacement Where hydraulic parameters representing the host porous medium are known a priori, both emplacement location and the cross-sectional area may be determined uniquely. For slow emplacement the intrusion rate may also be determined while only a lower limiting intrusion rate may be discerned for fast emplacement Two intrusive events at Krafla, Iceland are examined using the proposed moving dislocation model and satisfactory data matches obtained.