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Experimental evidence that thrust earthquake ruptures might open faults

Nature volume 545, pages 336–339 (2017)Cite this article

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Abstract

Many of Earth’s great earthquakes occur on thrust faults1. These earthquakes predominantly occur within subduction zones, such as the 2011 moment magnitude 9.0 eathquake in Tohoku-Oki, Japan, or along large collision zones, such as the 1999 moment magnitude 7.7 earthquake in Chi-Chi, Taiwan2. Notably, these two earthquakes had a maximum slip that was very close to the surface3,4. This contributed to the destructive tsunami that occurred during the Tohoku-Oki event and to the large amount of structural damage caused by the Chi-Chi event. The mechanism that results in such large slip near the surface is poorly understood as shallow parts of thrust faults are considered to be frictionally stable5. Here we use earthquake rupture experiments to reveal the existence of a torquing mechanism of thrust fault ruptures near the free surface that causes them to unclamp and slip large distances. Complementary numerical modelling of the experiments confirms that the hanging-wall wedge undergoes pronounced rotation in one direction as the earthquake rupture approaches the free surface, and this torque is released as soon as the rupture breaks the free surface, resulting in the unclamping and violent ‘flapping’ of the hanging-wall wedge. Our results imply that the shallow extent of the seismogenic zone of a subducting interface is not fixed and can extend up to the trench during great earthquakes through a torquing mechanism.

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Figure 1: A thrust fault modelled by dividing a rectangular plate with an angled cut.
Figure 2: A typical sub-Rayleigh rupture (P = 2.5 MPa) is chronologically portrayed at experimental times t = 58.5, 63.5, and 93.5 μs.
Figure 3: Recorded fault slip (vslip) and opening velocity (vopen).

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References

  1. Dixon, T. H . & Moore, J. C. The Seismogenic Zone of Subduction Thrust Faults (Columbia Univ. Press, 2007)

  2. Tanaka, H. et al. Frictional heat from faulting of the 1999 Chi-Chi, Taiwan earthquake. Geophys. Res. Lett. 33, L16316 (2006)

    Article  ADS  Google Scholar 

  3. Fujiwara, T. et al. The 2011 Tohoku-Oki earthquake: displacement reaching the trench axis. Science 334, 1240–1240 (2011)

    Article  ADS  CAS  Google Scholar 

  4. Ma, K.-F., Mori, J., Lee, S.-J. & Yu, S. Spatial and temporal distribution of slip for the 1999 Chi-Chi, Taiwan, earthquake. Bull. Seismol. Soc. Am. 91, 1069–1087 (2001)

    Article  Google Scholar 

  5. Saffer, D. M. & Marone, C. Comparison of smectite-and illite-rich gouge frictional properties: application to the updip limit of the seismogenic zone along subduction megathrusts. Earth Planet. Sci. Lett. 215, 219–235 (2003)

    Article  ADS  CAS  Google Scholar 

  6. Abrahamson, N. A. & Somerville, P. G. Effects of the hanging wall and footwall on ground motions recorded during the Northridge earthquake. Bull. Seismol. Soc. Am. 86, S93–S99 (1996)

    Google Scholar 

  7. Bilham, R. & Yu, T.-T. The morphology of thrust faulting in the 21 September 1999, Chichi, Taiwan earthquake. J. Asian Earth Sci. 18, 351–367 (2000)

    Article  ADS  Google Scholar 

  8. Brune, J. N. Shattered rock and precarious rock evidence for strong asymmetry in ground motions during thrust faulting. Bull. Seismol. Soc. Am. 91, 441–447 (2001)

    Article  Google Scholar 

  9. Vallage, A., Klinger, Y., Grandin, R., Bhat, H. S. & Pierrot-Deseilligny, M. Inelastic surface deformation during the 2013 Mw 7.7 Balochistan, Pakistan, earthquake. Geology 43, 1079–1082 (2015)

    Google Scholar 

  10. Savage, J. C. The stopping phase on seismograms. Bull. Seismol. Soc. Am. 55, 47–58 (1965)

    Google Scholar 

  11. Oglesby, D. D., Archuleta, R. J. & Nielsen, S. B. Earthquakes on dipping faults: the effects of broken symmetry. Science 280, 1055–1059 (1998)

    Article  ADS  CAS  Google Scholar 

  12. Madariaga, R. Radiation from a finite reverse fault in a half space. Pure Appl. Geophys. 160, 555–577 (2003)

    Article  ADS  Google Scholar 

  13. Brune, J. N. Particle motions in a physical model of shallow angle thrust faulting. Proc. Indian Acad. Sci. (Earth Planet. Sci.) 105, L197–L206 (1996)

    ADS  Google Scholar 

  14. Erdogan, F. & Arin, K. A half plane and a strip with an arbitrarily located crack. Int. J. Fract. 11, 191–204 (1975)

    Article  Google Scholar 

  15. Dmowska, R. & Rice, J. R. in Continuum Theories in Solid Earth Physics. Physics and Evolution of the Earth’s Interior Vol. 3 (ed. Teisseyre, R. ) (Elsevier, 1986)

  16. Rudnicki, J. W. & Wu, M. Mechanics of dip-slip faulting in an elastic half-space. J. Geophys. Res. 100, 22173–22186 (1995)

    Article  ADS  Google Scholar 

  17. Xia, K., Rosakis, A. J. & Kanamori, H. Laboratory earthquakes: the sub-Rayleigh-to-supershear rupture transition. Science 303, 1859–1861 (2004)

    Article  ADS  CAS  Google Scholar 

  18. Gabuchian, V., Rosakis, A. J., Lapusta, N. & Oglesby, D. D. Experimental investigation of strong ground motion due to thrust fault earthquakes. J. Geophys. Res. 119, 1316–1336 (2014)

    Article  ADS  Google Scholar 

  19. Kozdon, J. E. & Dunham, E. M. Rupture to the trench: dynamic rupture simulations of the 11 March 2011 Tohoku earthquake. Bull. Seismol. Soc. Am. 103, 1275–1289 (2013)

    Article  Google Scholar 

  20. Scholz, C. H. The rupture mode of the shallow large-slip surge of the Tohoku-Oki earthquake. Bull. Seismol. Soc. Am. 104, 2627–2631 (2014)

    Article  Google Scholar 

  21. Suppe, J. Fluid overpressures and strength of the sedimentary upper crust. J. Struct. Geol. 69, 481–492 (2014)

    Article  ADS  Google Scholar 

  22. Ide, S., Baltay, A. & Beroza, G. C. Shallow dynamic overshoot and energetic deep rupture in the 2011 Mw 9.0 Tohoku-Oki earthquake. Science 332, 1426–1429 (2011)

    Article  ADS  CAS  Google Scholar 

  23. Ma, K.-F. et al. Evidence for fault lubrication during the 1999 Chi-Chi, Taiwan, earthquake (Mw 7.6). Geophys. Res. Lett. 30, 1244 (2003)

    Article  ADS  Google Scholar 

  24. Allen, C. R., Brune, J. N., Cluff, L. S. & Barrows, A. G. Evidence for unusually strong near-field ground motion on the hanging wall of the San Fernando fault during the 1971 earthquake. Seismol. Res. Lett. 69, 524–531 (1998)

    Article  ADS  Google Scholar 

  25. Huang, Y., Meng, L. & Ampuero, J.-P. A dynamic model of the frequency-dependent rupture process of the 2011 Tohoku-Oki earthquake. Earth Planets Space 64, 1061–1066 (2012)

    Article  ADS  Google Scholar 

  26. Lykotrafitis, G. & Rosakis, A. J. Sliding along frictionally held incoherent interfaces in homogeneous systems subjected to dynamic shear loading: a photoelastic study. Int. J. Fract. 140, 213–233 (2006)

    Article  Google Scholar 

  27. Lu, X., Lapusta, N. & Rosakis, A. J. Analysis of supershear transition regimes in rupture experiments: the effect of nucleation conditions and friction parameters. Geophys. J. Int. 177, 717–732 (2009)

    Article  ADS  Google Scholar 

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Acknowledgements

We gratefully acknowledge the National Science Foundation (award number EAR-1321655), which has supported this research. We also acknowledge our colleague, N. Lapusta (California Institute of Technology) for comments and advice. H.S.B. acknowledges K. Kiara and A. Schubnel for inspiring this work.

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Authors and Affiliations

  1. Graduate Aerospace Laboratories, California Institute of Technology, 1200 East California Boulevard 105-50, Pasadena, 91105, California, USA

    Vahe Gabuchian & Ares J. Rosakis

  2. Laboratoire de Géologie, École Normale Supérieure, CNRS-UMR 8538, PSL Research University, Paris, 75005, France

    Harsha S. Bhat & Raúl Madariaga

  3. Seismological Laboratory, California Institute of Technology, 1200 East California Boulevard 252-21, Pasadena, 91105, California, USA

    Hiroo Kanamori

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  1. Vahe Gabuchian
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  4. Raúl Madariaga
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  5. Hiroo Kanamori
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Contributions

A.J.R., R.M. and H.S.B. concieved the study and designed the experiments. V.G. and A.J.R. conducted the experiments. R.M. and H.S.B. conducted numerical modelling studies. All authors contributed to analysis, interpretation and manuscript preparation.

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Correspondence to Harsha S. Bhat.

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The authors declare no competing financial interests.

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Reviewer Information Nature thanks C. Scholz and the other anonymous reviewer(s) for their contribution to the peer review of this work.

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Gabuchian, V., Rosakis, A., Bhat, H. et al. Experimental evidence that thrust earthquake ruptures might open faults. Nature 545, 336–339 (2017). https://doi.org/10.1038/nature22045

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