Guided Love- and Rayleigh-waves in Parkway Valley, Wainuiomata, N.Z.
DOI:
https://doi.org/10.5459/bnzsee.35.4.255-265Abstract
A detailed analysis of one earthquake recorded by a dense array of seismographs on the surface of an alluvial valley shows two locally-generated waves which propagate down-valley. The faster travelling one is a Rayleigh wave, and the slower one is similar to a Love wave, but has a vertical component thought to arise from the need to meet lateral boundary conditions. These waves can mimic normal modes, and their interaction provides a basis for explaining directional resonances.
References
Marsh, J., Larkin, T. J., Haines, A. J. and Benites, R. A. (1995) "Comparison of linear and nonlinear seismic responses of two-dimensional alluvial basins", Bulletin of the Seismological Society of America, 85, 874-889.
Graves, R. W., Pitarka, A. and Somerville, P. G. (1998) "Ground-motion amplification in the Santa Monica area; effects of shallow basin-edge structure", Bulletin of the Seismological Society of America, 88, 1224-1242.
Hisada, Y., Bao, H., Bielak, J., Ghattas, O. and O’Hallaron, D. (1998). "Simulations of Long-Period Ground Motions during the 1995 Hyogoken-Nanbu (Kobe) Earthquake using 3D Finite Element Method", Paper presented at the Proceedings of the 2nd International Symposium on Effect of Surface Geology on Seismic Motion, Yokohama, Japan, December, 1998, pg. 59-66.
Bielak, J., Xu, J. and Ghattas, O. (1999) "Earthquake Ground Motion and Structural Response in Alluvial Valley", Journal of Geotechnical and Geoenvironmental Engineering, 125, 404-412. DOI: https://doi.org/10.1061/(ASCE)1090-0241(1999)125:5(413)
Olsen, K. B. (2000) "Site amplification in the Los Angeles Basin from three-dimensional modeling of ground motion" in "Accounting for site effects in probabilistic seismic hazard analyses of Southern California", Bulletin of the Seismological Society of America, 90, S77-S94. DOI: https://doi.org/10.1785/0120000506
Satoh, T., Kawase, H., Sato, T. and Pitarka, A. (2001) "Three-dimensional finite-difference waveform modeling of strong motions observed in the Sendai Basin, Japan", Bulletin of the Seismological Society of America, 91, 812-825. DOI: https://doi.org/10.1785/0120000086
Chavez-Garcia, F. J., Rodriguez, M., and Stephenson, W.R. (1998). "1D vs 2D site effects. The case of Parkway basin, New Zealand". Paper presented at the European Conference on Earthquake Engineering (11th: 1998).
Chavez-Garcia, F. J., Stephenson, W.R and Rodriguez, M. (1999) "Lateral propagation effects observed at Parkway, New Zealand: a case history to compare ID versus 2D site effects", Bulletin of the Seismological Society of America, 89 (3), 718-732.
Stephenson, W. R. and Chavez-Garcia, F.J. (1998) "Preliminary assessment of resonant phenomena recorded by the Parkway Network", Institute of Geological & Nuclear Sciences, Science Report 98/18.
Stephenson, W. R. (2000) "The dominant resonance response of Parkway Basin" in World Conference on Earthquake Engineering (12th: 2000: Auckland, NZ).
Gledhill, K. R., Randall, M. J. and Chadwick, M. P. (1991) "The EARSS digital seismograph: system description and field trials", Bulletin of the Seismological Society of America, 81 (4), 1380-1390.
Beetham, R. D. (1999) "Microzoning project Parkway Basin subsurface investigations, Wainuiomata" Institute of Geological & Nuclear Sciences, Science Report 99/14.
Stephenson, W. R. and Barker, P.R. (2000) "Seismic CPT in strong soils" Institute of Geological and Nuclear Sciences, Science Report 2000/47.
Bath, M. (1974) "Spectral analysis in geophysics", Elsevier, Amsterdam.
Nelder, J. A. and Mead, R. (1965) "A Simplex Method for Function Minimization." Comput. J., 7, 308-313. DOI: https://doi.org/10.1093/comjnl/7.4.308
Bard, P.-Y. and Bouchon, M. (1985) "The two-dimensional resonance of sediment-filled valleys", Bulletin of the Seismological Society of America, 75, 519-541.
Paolucci, R., Faccioli, E., Chiesa, F. and Cotignola, R. (2001) "Searching for 2D/3D Site Response Patterns in Weak and Strong Motion Array Data from Different Regions", Paper presented at the 6th Int. Conf on Seismic Zonation, Palm Springs.
Stephenson, W.R. (1974) "Earthquake induced resonant motion of alluvium", Bulletin of the New Zealand National Society for Earthquake Engineering, 7 (3), 144-146.
Stephenson, W. R. (1989) "Observation of a directed resonance in soil driven by transverse rock motion", Bulletin of the New Zealand National Society for Earthquake Engineering, 22 (2), 81-89. DOI: https://doi.org/10.5459/bnzsee.22.2.81-89
Bonamassa, O. and Vidale, J. E. (1990) "Investigation of directional site resonances using aftershocks from the Loma Prieta earthquake" in 85th annual meeting of the Seismological Society of America Santa Cruz, CA, United States.
