Recovering Seismic Displacements from Underground Strong-Motion Acceleration Records of the 2011 M_W9.0 Tohoku Earthquake in Japan

Abstract:

The borehole strong-motion (SM) records from the 2011 MW9.0 Tohoku earthquake are analyzed, and we find ground tilt is the main error source of the SM records. The assumption is made that the time in when ground tilt fluctuates tempestuously (transient tilt) can be determined by the vertical velocity time-series. Then, we propose a two-step algorithm to correct these errors, which involves fitting a straight line to the tail portion of velocity for permanent tilt and average error processing of the transient tilt and noises caused by it. The transient tilt is unknown, but its final influence can be estimated as the velocity at the time when strong shaking ceased. The horizontal accelerograms are corrected and the displacements are obtained by double integration. Comparing with the GPS data, seismic displacements can be recovered by the corrected underground SM acceleration records.

• Periodical: Advanced Materials Research (Volumes 671-674)
• Pages: 1418-1422
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.671-674.1418
• Online since: March 2013
• Authors: Heng Li, Shui Ming Zheng, Chen Song, Qian Feng
• Keywords: Baseline Correction, Ground Tilt, Seismic Displacement, Underground Strong-Motion

References

[1] S.W. Park, H. Ghasemi, J. Shen, P.G. Somerville, W.P. Yen and M. Yashinsky: Earthquake Engineering and Structure Dynamics. Vol. 33 (2004), pp.1249-1270.

DOI: 10.1002/eqe.395

[2] J.C. Hu, L.W. Cheng, H.Y. Chen, Y.M. Wu, J.C. Lee, Y.G. Chen, K.C. Lin, R.J. Rau, H. Kuochen, H.H. Chen, S. B Yu and J. Angelier: Geophysical Journal International. Vol. 169 (2007), pp.667-674.

DOI: 10.1111/j.1365-246x.2007.03359.x

[3] S. Akkar and D.M. Boore: Bulletin of the Seismological Society of America. Vol. 99 (2009), pp.1671-1690.

[4] W.D. Iwan, M.A. Moser and C.Y. Peng: Bulletin of the Seismological Society of America. Vol. 75 (1985), pp.1225-1246.

[5] M.D. Trifunac and M.I. Todorovska: Soil Dynamics and Earthquake Engineering. Vol. 21 (2001), pp.275-286.

[6] D.M. Boore, C.D. Stephens and W.B. Joyner: Bulletin of the Seismological Society of America. Vol. 92 (2002), pp.1543-1560.

[7] G.Q. Wang, D.M. Boore, H. Igel, et al.: Bulletin of the Seismological Society of America. Vol. 93 (2003), pp.674-693.

[8] V.M. Graize: Soil Dynamics and Earthquake Engineering. Vol. 25 (2005), pp.197-204.

[9] D.M. Boore: Bulletin of the Seismological Society of America. Vol. 91. (2001), pp.1199-1211.

[10] L.E. Gordon, S.H. Jennifer, C. Kyuhong, et al.: Bulletin of the Seismological Society of America. Vol. 97 (2007), pp.357-378.

[11] H. Li, D. Wang, Y.J. Cai, et al.: Advanced Materials Research. Vol. 378-379 (2011), pp.247-250.

[12] A. Cochard, H. Igel, B. Schuberth, et al., in: Rotational Motions in Seismology: Theory, Observation, Simulation, in Earthquake Source Asymnetry, Structural Media and Rotation Effects. SpringerVerlag, Heidelberg (2006).

DOI: 10.1007/3-540-31337-0_30

[13] S. Kinoshita: Bulletin of the Seismological Society of America. Vol. 98 (2008), pp.1887-1897.

[14] S.K. Mitra and J.M. Kaiser: Handbook for Digital Signal Processing. Wiley, New York (1993).