Analysis of Strong Ground Motion Characterization in the 2013 Lushan Earthquake

Abstract:

Lushan earthquake on 20th April, 2013 was another thrust fault earthquake occurred at Longmen Mountain Fault Zone after 2008 Wenchuan Ms8.0 earthquake. Based on ground motion attenuation model, this paper has chosen 45 strong motion records with rupture distance less than 200km, to analyze the hanging wall effect, topographic effect and rupture directivity effect of Lushan earthquake. The results show that hanging wall effect in Lushan earthquake was not obvious as 2008 Wenchuan earthquake; ground motion in mountain areas attenuated with increasing rupture distance more quickly than that in plain areas; rupture directivity effect is obvious for two components of horizontal ground motion, which are fault-perpendicular and fault-parallel components. PGA in the forward rupture area is larger than those in the backward rupture area. With the period increased, the gap between backward and forward rupture area become small, and finally PGD in backward rupture area is greater than those in the forward rupture area.

• Periodical: Applied Mechanics and Materials (Volumes 580-583)
• Pages: 1499-1505
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.580-583.1499
• Online since: July 2014
• Authors: Tian Yu*, Ming Lu, Xiao Jun Li
• Keywords: Directivity Effect, Ground Motion, Hanging Wall Effect, Lushan Earthquake, Topographic Effect

References

[1] X.W. Xu, G.H. Chen, G.H. Yu, et al. Seismogenic structure of Lushan earthquake and its relationship with Wenchuan earthquake. Earth Science frontiers, Vol. 20(3)(2013), p.11.

[2] N. A. Abrahamson, P.G. Somerville. Effects of the hanging wall and footwall on ground motions recorded during the Northridge earthquake．Bull Seism Soc Amer, Vol. 86(1B)(1996),P. 93.

DOI: 10.1785/bssa08601b0s93

[3] Y.X. Yu, M.T. Gao. Effect of the hanging wall and footwall on peak acceleration during the Chi-Chi earthquake, Taiwan. Acta Seismologica Sinica(in Chinese), Vol. 23(6)(2001),P. 615.

DOI: 10.1007/bf02718076

[4] D. Wang, L.L. Xie. Geometric effects resulting from the asymmetry of dipping fault：Hanging wall/footwall effects. Acta Seismologica Sinica(in Chinese), Vol. 30(3)(2008), P. 271.

DOI: 10.1007/s11589-008-0275-4

[5] T.Y. Chang, F. cotton, Y.B. Tsai et al. Quantification of hanging—wall effects on ground motion：Some insights from the 1999 Chi-Chi earthquake．Bull Seism Soc Amer，Vol. 94(6)(2004), P. 186.

[6] P.G. Somerville, N.F. Smith and R.W. Graves. Modification of empirical strong ground motion attenuation relations to include the amplitude and duration effects of rupture directivity. Seismological research letters, Vol. 68(1)(1997),P. 199.

DOI: 10.1785/gssrl.68.1.199

[7] Y. Zhang, L.S. Xu and Y.T. Chen. Rupture process of the Lushan 4. 20 earthquake and preliminary analysis on the disaster-causing mechanism. Chinese J. Geophys (in Chinese), Vol. 56(4)(2013), P. 1408.

[8] C.L. Liu, Y. Zheng, C. Ge et al. Rupture process of the 2013 Lushan Ms 7. 0 earthquake. Science China: Earth Sciences, Vol. 43(6)(2013), P. 1020.

[9] D.M. Boore, J.W. Lamprey and N.A. Abrahamson. Orientation-Independent measures of ground motion. Bull Seism Soc Amer, Vol. 96(4A)(2006), P. 1502.

[10] R.Z. Wen, Y.F. Ren, W.H. Qi et al. Maximum acceleration recording from Lushan earthquake on april 20, 2013. Journal of Southwest Jiaotong University(in Chinese), Vol. 48(5)(2013),P. 783.

[11] X.J. Li, L. Liu, Y.S. Wang et al. Analysis of Horizontal Strong-Motion Attenuation in the Great 2008 Wenchuan Earthquake. Bull Seism Soc Amer, Vol. 100(5B)(2010), P. 2440.

DOI: 10.1785/0120090245