1887

Abstract

Summary

We detect and analyze repeating earthquake sequences in the Basel 1 microseismic data set. Using a combination of waveform similarity and estimates of source radius we identify 144 repeating earthquake sequences with a total of 422 events. The specific spatio-temporal behaviour of the repeating events indicates clearly that they are more sensitive to pore pressure changes than the total induced seismicity, which is at larger distances (more than about 250–300m from the injection source in the Basel reservoir) not only affected by pore pressure variations, but presumably also by stress transfer from the larger (Mw>2.0) events. The results suggest that repeating earthquakes may contribute to identifying and differentiating the dominant triggering effects of recorded microseismicity.

Furthermore, this study shows that a significant percentage of the fractures stimulated in the Basel reservoir ruptured repeatedly: More than 15% of all located events are repeaters. We anticipate that the occurrence of repeating events is a common feature in injection induced microseismic data sets, and that it is useful to incorporate repeating events in future statistical analyses of microseismic data, which so far generally assume that each potential source in the stimulated reservoir can only fail one-time.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.20140718
2014-06-16
2024-04-12
Loading full text...

Full text loading...

References

  1. Bachmann, C., Wiemer, S., Goertz-Allmann, B. and Woessner, J.
    [2012] Influence of pore-pressure on the event-size distribution of induced earthquakes. Geophys. Res. Lett., 39(L09302), doi: 10.1029/2012GL051480.
    https://doi.org/10.1029/2012GL051480 [Google Scholar]
  2. Catalli, F., Meier, M. and Wiemer, S.
    [2013] The role of Coulomb stress changes for injection-induced seismicity: The Basel enhanced geothermal system. Geophys. Res. Lett., 40(72–77), doi:10.1029/2012GL054147.
    https://doi.org/10.1029/2012GL054147 [Google Scholar]
  3. Chen, K., Bürgmann, R. and Nadeau, R.
    [2013] Do earthquakes talk to each other? Triggering and interaction of repeating sequences in Parkfield. J. Geophys. Res., 118, doi:10.129/2012/JB009486.
    https://doi.org/10.129/2012/JB009486 [Google Scholar]
  4. Deichmann, N. and Giardini, D.
    [2009] Earthquakes induced by the stimulation of an Enhanced Geothermal System below Basel (Switzerland). Seismol. Res. Let., 80, doi:10.1785/gssrl.80.5.784.
    https://doi.org/10.1785/gssrl.80.5.784 [Google Scholar]
  5. Dinske, C. and Shapiro, S.
    [2010] Interpretation of microseismicity induced by timpe-dependent injection pressure. SEG Expanded Abstracts, 29, 2125–2129, doi:10.1190/1.3513264.
    https://doi.org/10.1190/1.3513264 [Google Scholar]
  6. Eshelby, J.
    [1957] The determination of the elastic field of an ellipsoidal inclusion, and related problems. Proc. R. Soc. London, Series A, 24, 376–396.
    [Google Scholar]
  7. Goertz-Allmann, B., Goertz, A. and Wiemer, S.
    [2011] Stress drop variations of induced earthquakes at the Basel geothermal site. Geophys. Res. Lett., 38(L09308), doi:10.1029/2011GL047498.
    https://doi.org/10.1029/2011GL047498 [Google Scholar]
  8. Häring, M., Schanz, U., Ladner, F. and Dyer, B.C.
    [2008] Characterisation of the Basel 1 enhanced geothermal system. Geothermics, doi:10.1016/j.geothermics.2008.06.002.
    https://doi.org/10.1016/j.geothermics.2008.06.002 [Google Scholar]
  9. Kanamori, H.
    [1977] The energy release in great earthquakes. J. Geophys. Res., 82, 2981–2987.
    [Google Scholar]
  10. Kummerow, J., Shapiro, S., Asanuma, H. and Häring, M.
    [2011] Application of an arrival time and cross correlation value-based location algorithm to the Basel 1 microseismic data. Expanded abstracts, EAGE 73rd annual meeting and technical exhibition, Vienna.
    [Google Scholar]
  11. Mukuhira, Y., Asanuma, H., Niitsuma, H. and Häring, M.
    [2013] Characteristics of large-magnitude microseismic events recorded during and after the stimulation of a geothermal rservoir at Basel, Switzerland. Geothermics, doi:10.1016/j.geothermics.2012.07.005.
    https://doi.org/10.1016/j.geothermics.2012.07.005 [Google Scholar]
  12. Nadeau, R. and Johnson, L.
    [1998] Seismological studies at Parkfield VI: Moment release rates and estimates of source parameters for small repeating earthquakes. Bull. Seism. Soc. Am., 88(3), 790–814.
    [Google Scholar]
  13. Rothert, E. and Shapiro, S.
    [2007] Statistics of fracture strength and fluid-induced seismicity. J. Geophys. Res., 112(B4), doi:10.1029/2005JB003959.
    https://doi.org/10.1029/2005JB003959 [Google Scholar]
  14. Terakawa, T., Miller, S. and Deichmann, N.
    [2012] High fluid pressure and triggered earthquakes in the enhanced geothermal system in Basel, Switzerland. J. Geophys. Res., 117, doi:10.129/2011JB008980.
    https://doi.org/10.129/2011JB008980 [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20140718
Loading
/content/papers/10.3997/2214-4609.20140718
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error