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Post-earthquake ground movements correlated to pore-pressure transients

Abstract

Large earthquakes alter the stress in the surrounding crust, leading to triggered earthquakes and aftershocks1,2,3. A number of time-dependent processes, including afterslip, pore-fluid flow and viscous relaxation of the lower crust and upper mantle, further modify the stress and pore pressure near the fault, and hence the tendency for triggered earthquakes4,5. It has proved difficult, however, to distinguish between these processes on the basis of direct field observations, despite considerable effort6. Here we present a unique combination of measurements consisting of satellite radar interferograms7 and water-level changes in geothermal wells following two magnitude-6.5 earthquakes in the south Iceland seismic zone. The deformation recorded in the interferograms cannot be explained by either afterslip or visco-elastic relaxation, but is consistent with rebound of a porous elastic material in the first 1–2 months following the earthquakes. This interpretation is confirmed by direct measurements which show rapid (1–2-month) recovery of the earthquake-induced water-level changes. In contrast, the duration of the aftershock sequence is projected to be 3.5 years, suggesting that pore-fluid flow does not control aftershock duration. But because the surface strains are dominated by pore-pressure changes in the shallow crust, we cannot rule out a longer pore-pressure transient at the depth of the aftershocks. The aftershock duration is consistent with models of seismicity rate variations based on rate- and state-dependent friction laws.

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Figure 1: Map showing the location of the two June 2000 (moment magnitude Mw = 6.5) earthquakes in south Iceland.
Figure 2: Synthetic aperture radar interferograms (InSAR) showing observed and simulated post-seismic deformation in south Iceland.
Figure 3: Coseismic and post-seismic water-level changes in geothermal wells in south Iceland.
Figure 4: Water-level recoveries and aftershock decay in south Iceland.

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Acknowledgements

We thank the European Space Agency for providing the SAR data. We also thank G. Guðmundsson and R. Stefánsson for providing preliminary earthquake locations from the South Iceland Lowland (SIL) seismic network; A. Clifton and P. Einarsson for providing data of the mapped surface ruptures; F. Sigmundsson, T. Árnadóttir, K. Ágústsson, E. Roeloffs and K. Feigl for discussions; and R. Bürgmann for comments and suggestions that improved the paper.

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Correspondence to Sigurjón Jónsson.

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Jónsson, S., Segall, P., Pedersen, R. et al. Post-earthquake ground movements correlated to pore-pressure transients. Nature 424, 179–183 (2003). https://doi.org/10.1038/nature01776

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