NIU ZHIREN, CHEN DANGMIN h. 1987: SLIP-WEAKENING INSTABILITY ON A STRIKE-SLIP FAULT WITH ASPERITY. Acta Seismologica Sinica, 9(3): 253-265.
Citation: NIU ZHIREN, CHEN DANGMIN h. 1987: SLIP-WEAKENING INSTABILITY ON A STRIKE-SLIP FAULT WITH ASPERITY. Acta Seismologica Sinica, 9(3): 253-265.

SLIP-WEAKENING INSTABILITY ON A STRIKE-SLIP FAULT WITH ASPERITY

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  • Published Date: September 01, 2011
  • In this paper, we have studied the slip-weakening instability on a finite and vertical strike-slip fault with asperity. We assumed that the fault strength is uniform in depth, but the strength is non-uniform in the strike direction, i.e., there is asperity on the fault. The segments with and without asperity of the fault follow the same type of constitutive law, but have different peak stresses. The material surrounding the fault is represented by elastic plates whose upper-surface and bottom are stress-free. We use finite element method to study the evolution of theoretical displacement, stress and strain fields that vary with a remote displacement. When the displacement and frictional stress are not given in advance but are determined in the solving process. According to the results, we have compared the differences of theoretical displacement and the distribution of frictional stress on the fault between stable and unstable slip. In addition, we have compared the results in this paper with known results for the strike-slip fault with a segment of lower strength.
  • [1] Stuart, W. D., Strain softening prior to two——dimensional strike——slip earthquakes, J. Geophys. Res., 84,1063——1070, 1979.

    [2] Stuart, W. D. and G. M. Mavko, earthquake instability on a strike——slip fault, J. Geophys. Ret., 84, 2153——2160, 1979.

    [3] Reasenberg, P. and W. L. Ellsworth, Aftershocks of the Coyote Lake, California, earthquake of August 6,1979: A detailed study, J. Geophys. Res., 87, 10637——10655, 1982.

    [4] Pechmann, J. C. and H. Kanamori, Waveforms and spectra of preshocks and aftershocks of the 1979 Imperial Valley, California earthquake: Evidence for fault heterogeneityl, J. Geophys. Res., 87, 10579——10597,1982.

    [5] McGarr, A., D. Pollard, N. C. Gay and }W. O. Ortlepp, Observations and analysis of structures in exhumed mine——induced faults, Proceedings of Conference VIII, Analysis of Actual Fault Zones in Bedrock, U. S.Geol. Surv. Open File Rep., 79——1239, 101——120, 1979.

    [6] Segall, P, and D. D. Pollard, Nucleation and growth of strike slip faults in granite, J. Geophys. Res., 88,555——568, 1983.

    [7] Kanamori, H. and G. S. Stewart, Seismological aspects of the Guatemala earthquake of February 4, 1976,J. Geophys. Res., 83, 3427——3434, 1978.

    [8] Kanamori, H., Use of seismic radiation to infer source parameters, Proceedings of Conference III, Fault Mechanics and Its Relation to Earthquake Prediction, Geol. Surv. Open File Rep. U. S., 78——380, 283——318, 1978.

    [9] Das, S. and K. Aki, Fault plane with barriers: A versatile earthquake model, J. Geophyt. Res., 82, 5658——5670, 1977.

    [10] Aki, K., Characterization of barriers on an earthquake fault, J. Geophys. Res., 84, 6140——6148, 1979.

    [11] Mikumo, T. and T. Miyatake, Earthquake sequences on a frictional fault model with non——uniform strengths and relaxation times, Geophys. J. R. Astron. Soc., 59, 497——522, 1979.

    [12] Ishiad, M. and H. Kanamori, The foreshock activity of the 1971 San Fernando, California earthquake, Bull.Seismol. Soc. Am., 68, 1265——1279, 1978.

    [13] Ishiad, M. and H. Kanamori, Temporal variation of seismicity and spectrum of small earthquakes preced——ing the 1952 Kern County, California earthquake, Bull. Seismol. Sac. Am., 70, 509——528, 1980.

    [14] Lay, T. and H. Kanamori, Earthquake doublets in the Solomon Islands, Phys. Earth Planet. Inter., 21,283——304, 1980.

    [15] Dmowska, R. and V. C. Li, A mechanical model of precursory source processes for some large earthquake,Ceophys. Res. Lett., 9, 393——396, 1982.

    [16] Niu Zhiren(牛志仁)and Zhang Yi(张逸),Analysis for slip——softening instability on a heterogeneous fault by finite element method,地震研究,8, 281——302, 1985.

    [17] 陈运泰、黄立人、林邦慧、刘妙龙、王新华,用大地测量资料反演的1976年唐山地震的位错模式,地球物理学报, 22, 201——216, 1979

    [1] Stuart, W. D., Strain softening prior to two——dimensional strike——slip earthquakes, J. Geophys. Res., 84,1063——1070, 1979.

    [2] Stuart, W. D. and G. M. Mavko, earthquake instability on a strike——slip fault, J. Geophys. Ret., 84, 2153——2160, 1979.

    [3] Reasenberg, P. and W. L. Ellsworth, Aftershocks of the Coyote Lake, California, earthquake of August 6,1979: A detailed study, J. Geophys. Res., 87, 10637——10655, 1982.

    [4] Pechmann, J. C. and H. Kanamori, Waveforms and spectra of preshocks and aftershocks of the 1979 Imperial Valley, California earthquake: Evidence for fault heterogeneityl, J. Geophys. Res., 87, 10579——10597,1982.

    [5] McGarr, A., D. Pollard, N. C. Gay and }W. O. Ortlepp, Observations and analysis of structures in exhumed mine——induced faults, Proceedings of Conference VIII, Analysis of Actual Fault Zones in Bedrock, U. S.Geol. Surv. Open File Rep., 79——1239, 101——120, 1979.

    [6] Segall, P, and D. D. Pollard, Nucleation and growth of strike slip faults in granite, J. Geophys. Res., 88,555——568, 1983.

    [7] Kanamori, H. and G. S. Stewart, Seismological aspects of the Guatemala earthquake of February 4, 1976,J. Geophys. Res., 83, 3427——3434, 1978.

    [8] Kanamori, H., Use of seismic radiation to infer source parameters, Proceedings of Conference III, Fault Mechanics and Its Relation to Earthquake Prediction, Geol. Surv. Open File Rep. U. S., 78——380, 283——318, 1978.

    [9] Das, S. and K. Aki, Fault plane with barriers: A versatile earthquake model, J. Geophyt. Res., 82, 5658——5670, 1977.

    [10] Aki, K., Characterization of barriers on an earthquake fault, J. Geophys. Res., 84, 6140——6148, 1979.

    [11] Mikumo, T. and T. Miyatake, Earthquake sequences on a frictional fault model with non——uniform strengths and relaxation times, Geophys. J. R. Astron. Soc., 59, 497——522, 1979.

    [12] Ishiad, M. and H. Kanamori, The foreshock activity of the 1971 San Fernando, California earthquake, Bull.Seismol. Soc. Am., 68, 1265——1279, 1978.

    [13] Ishiad, M. and H. Kanamori, Temporal variation of seismicity and spectrum of small earthquakes preced——ing the 1952 Kern County, California earthquake, Bull. Seismol. Sac. Am., 70, 509——528, 1980.

    [14] Lay, T. and H. Kanamori, Earthquake doublets in the Solomon Islands, Phys. Earth Planet. Inter., 21,283——304, 1980.

    [15] Dmowska, R. and V. C. Li, A mechanical model of precursory source processes for some large earthquake,Ceophys. Res. Lett., 9, 393——396, 1982.

    [16] Niu Zhiren(牛志仁)and Zhang Yi(张逸),Analysis for slip——softening instability on a heterogeneous fault by finite element method,地震研究,8, 281——302, 1985.

    [17] 陈运泰、黄立人、林邦慧、刘妙龙、王新华,用大地测量资料反演的1976年唐山地震的位错模式,地球物理学报, 22, 201——216, 1979

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