Earth, Planets and Space

, Volume 55, Issue 9, pp 515–530 | Cite as

Effect of complex fault geometry and slip style on near-fault strong motions and static displacement

Open Access
Article

Abstract

Although there are many studies that deal with complex slip distribution or rupture propagation on an earthquake fault, they usually regard a fault system as a fault of simple geometry. Actual fault systems have highly heterogeneous slip distribution and very complicated shapes, as is often observed through field surveys of surface breaks. In this study, we synthesize seismograms including static displacement near a fault using the discrete wavenumber method in order to estimate the effects of the above types of fault complexity in a quantitative manner. We introduce a complex slip distribution based on the Nojima Fault associated with the 1995 Hyogo-ken Nanbu earthquake. As a result, we show that strong motions at a frequency of lower than 1.0 Hz are strongly affected by the complexity of the fault geometry, at a scale of not more than several km, rather than the rupture propagation style. Distributions of static displacement fluctuate, depending on the fault geometry characterized by the length of each fault segment. Such small-scale variations in fault geometry (≤1 km) have been mostly ignored prior to this work. Our results also suggest that details of fault segmentation and bending can be determined by dense observations (e.g., GPS or geological surveys) of static displacement near a fault system, indicating the importance of simultaneous studies on static and dynamic near-fault motions.

Key words

Near field strong motion fault geometry kinematic model 

References

  1. Aki, K. and P. G. Richards, Quantitative Seismology: Theory and Methods, W. H. Freeman and Co., San Francisco, 1980.Google Scholar
  2. Aochi, H. and E. Fukuyama, Three-dimensional nonplanar simulation of the 1992 Landers earthquake, J. Geophys. Res., 102, 10.1029/2000JB000061, 2002.Google Scholar
  3. Aochi, H., R. Madariaga, and E. Fukuyama, Effect of normal stress during rupture propagation along nonplanar faults, J. Geophys. Res., 107, 10.1029/2001JB000500, 2002.Google Scholar
  4. Archuleta, R. and S. Hartzell, Effects of fault finiteness on near-source ground motion, Bull. Seis. Soc. Am., 71, 939–957, 1981.Google Scholar
  5. Bernard, P., A. Herrero, and C. Berge, Modeling directivity of heterogeneous earthquake ruptures, Bull. Seis. Soc. Am., 86, 1149–1160, 1996.Google Scholar
  6. Beroza, G. and T. Mikumo, Short slip duration in dynamic rupture in the presence of heterogeneous fault properties, J. Geophys. Res., 101, 22,449–22,460, 1996.CrossRefGoogle Scholar
  7. Bouchon, M., A dynamic source model for the San Fernando earthquake, Bull. Seis. Soc. Am., 68, 1555–1576, 1978.Google Scholar
  8. Bouchon, M. and K. Aki, Discrete wave-number representation of seismic-source wave fields, Bull. Seis. Soc. Am., 67, 259–277, 1977.Google Scholar
  9. Chin, B. H., Simultaneous Study of the Source, Path and Site Effects on Strong Ground Motion during the 1989 Loma Prieta Earthquake, Ph.D. thesis, University of Southern California, 1992.Google Scholar
  10. Cotton, F. and O. Coutant, Dynamic stress variations due to shear faults in a plane-layered medium, Geophys. J. Int., 128, 676–688, 1997.CrossRefGoogle Scholar
  11. Fukuyama, E. and R. Madariaga, Rupture dynamics of a planar fault in a 3D elastic medium: Rate- and slip-weakening friction, Bull. Seis. Soc. Am., 88, 1–17, 1998.Google Scholar
  12. Furumura, T. and K. Koketsu, Specific distribution of ground motion during the 1995 Kobe earthquake and its generation mechanism, Geophys. Res. Lett., 25, 785–788, 1998.CrossRefGoogle Scholar
  13. Harris, R. and S. Day, Dynamics of fault interaction: Parallel strike-slip faults, J. Geophys. Res., 98, 4461–4472, 1993.CrossRefGoogle Scholar
  14. Harris, R. and S. Day, Dynamic 3-D simulations of earthquakes on en echelon faults, Geophys. Res. Lett., 26, 2089–2092, 1999.CrossRefGoogle Scholar
  15. Hartzell, S. H. and T. H. Heaton, Rupture history of the 1984 Morgan Hill, California, earthquake from the inversion of strong-motion data records, Bull. Seis. Soc. Am., 76, 649–674, 1986.Google Scholar
  16. Hayashi, H., Fractal analysis of the fault system and stress drop of aftershocks for Hyogoken-nambu earthquake, Senior Thesis, Hiroshima University, 1996.Google Scholar
  17. Herrero, A. and P. Bernard, A kinematic self-similar rupture process for earthquakes, Bull. Seis. Soc. Am., 84, 1216–1228, 1994.Google Scholar
  18. Hisada, Y., A theoretical omega-square model considering the spatial variation in slip and rupture velocity, Bull. Seis. Soc. Am., 90, 387–400, 2000.CrossRefGoogle Scholar
  19. Honda, R. and K. Yomogida, Contribution of vertically traveling plane S-waves to dynamic and static displacements near a finite fault, Geophys. J. Int., 152, 443–454, 2003a.CrossRefGoogle Scholar
  20. Honda, R. and K. Yomogida, Static and dynamic displacement near a fault with the discrete wavenumber method, Phys. Earth Planet. Inter., 137, 107–127, 2003b.CrossRefGoogle Scholar
  21. Inoue, T. and T. Miyatake, 3-D simulation of near-field strong motion: Basin edge effect derived from rupture directivity, Geophys. Res. Lett., 24, 905–908, 1997.CrossRefGoogle Scholar
  22. Inoue, T. and T. Miyatake, 3D simulation of near-field strong ground motion based on dynamic modeling, Bull. Seis. Soc. Am., 88, 1445–1456, 1998.Google Scholar
  23. Kakehi, Y. and K. Irikura, Estimation of high-frequency wave radiation areas on the fault plane by the envelope inversion of acceleration seismograms, Geophys. J. Int., 125, 892–900, 1996.CrossRefGoogle Scholar
  24. Kase, Y. and K. Kuge, Rupture propagation beyond fault discontinuities: Significance of fault strike and location, Geophys. J. Int., 147, 330–342, 2001.CrossRefGoogle Scholar
  25. Kawase, H., Strong motion evaluation in the near-fault region considering the slip-velocity function of the source, in Confronting Urban Earthquakes, edited by K. Toki, pp. 410–413, 2000.Google Scholar
  26. Li, Y., K. Aki, D. Adams, and A. Hasemi, Seismic guided waves trapped in the fault zone of the Landers, California, earthquake of 1992, J. Geophys. Res., 99, 11,705–11,722, 1994.CrossRefGoogle Scholar
  27. Matsumoto, N., K. Yomogida, and S. Honda, Fractal analysis of fault systems in Japan and the Philippines, Geophys. Res. Lett., 19, 357–360, 1992.CrossRefGoogle Scholar
  28. Michel, R. and J.-P. Avouac, Deformation due to the 17 August 1999 Izumit, Turkey, earthquake measured from SPOT images, J. Geophys. Res., 107, 10.1029/200JB000102, 2002.Google Scholar
  29. Miyatake, T., Computer simulation of strong ground motion near a fault using dynamic fault rupture modeling: Spatial distribution of the peak ground velocity vectors, Pure Appl. Geophys., 157, 2063–2081, 2000.CrossRefGoogle Scholar
  30. Nakata, T. and K. Yomogida, Surface fault characteristics of the 1995 Hyogoken-nambu earthquake, J. Natural Disas. Sci., 16, 1–9, 1995.Google Scholar
  31. Nakata, T., H. Tsutsumi, R. S. Punongbayan, R. E. Rimando, J. Daligdig, and A. Daag, Surface faulting associated with the Philippine earthquake of 1990, Journal of Geography, 99, 95–112, 1990.Google Scholar
  32. Oglesby, D., R. J. Archuleta, and S. Nielsen, The three-dimensional dynamics of dipping fault, Bull. Seism. Sci. Am., 90, 616–628, 2000.CrossRefGoogle Scholar
  33. Okubo, P. G. and K. Aki, Fractal geometry in the San Andreas fault system, J. Geophys. Res., 92, 345–355, 1987.CrossRefGoogle Scholar
  34. Ruppert, S. D. and K. Yomogida, A crack-like rupture model for the 19 September 1985 Michoacan, Mexico, earthquake, PAGEOPH, 138, 407–427, 1992.CrossRefGoogle Scholar
  35. Sekiguchi, H., K. Irikura, T. Iwata, Y. Kakehi, and M. Hoshiba, Minute locating of faulting beneath Kobe and the waveform inversion of the source process during the 1995 Hyogo-ken Nanbu, Japan, earthquake using strong ground motion records, J. Phys. Earth, 44, 473–487, 1996.CrossRefGoogle Scholar
  36. Sekiguchi, H., K. Irikura, and T. Iwata, Fault geometry at the rupture termination of the 1995 Hyogo-ken Nanbu earthquake, Bull. Seis. Soc. Am., 90, 117–133, 2000.CrossRefGoogle Scholar
  37. Wald, D. J. and T. Heaton, Spatial and temporal distribution of slip for the 1992 Landers, California, earthquake, Bull. Seis. Soc. Am., 84, 668–691, 1994.Google Scholar
  38. Wald, D. J., T. Heaton, and K. Hudnut, The slip history of the 1994 Northridge, California, earthquake determined from strong-motion, teleseismic, GPS, and leveling data, Bull. Seis. Soc. Am., 86, S49–S70, 1996.Google Scholar
  39. Yeats, R. S., K. Sieh, and C. R. Allen, The Geology of Earthquakes, Oxford University Press, New York, 1997.Google Scholar
  40. Yomogida, K., Crack-like rupture processes observed in near-fault strong motion data, Geophys. Res. Lett., 15, 1223–1226, 1988.CrossRefGoogle Scholar
  41. Yoshida, S., K. Koketsu, B. Shibazaki, T. Sagiya, T. Kato, and Y. Yoshida, Joint inversion of near- and far-field waveforms and geodetic data for the rupture process of the 1995 Kobe earthquake, J. Phys. Earth, 44, 437–454, 1996.CrossRefGoogle Scholar

Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2003

Authors and Affiliations

  1. 1.Division of Earth and Planetary Sciences, Graduate School of ScienceHokkaido UniversitySapporoJapan
  2. 2.National Research Institute for Earth Science and Disaster PreventionIbarakiJapan

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