| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
INSTITUTO DE INGENIERÍA, UNAM CIUDAD UNIVERSITARIA, APDO, 70-472, COYOACÁN 04510, MÉXICO, D.F. cMéxico
CENTRO DE INVESTIGACIÓN SÍSMICA, A.C. FUNDACIÓN J. BARROS SIERRA CARR. AL AJUSCO 203, COL. H DE PADIERNA, TLALPÁN 14200, MÉXICO D.F. México
OBSERVATOIRE DE GRENOBLE UNIVERSITÉ JOSEPH FOURIER L.G.I.T.-I.R.I.G.M., B.P. 53X, 38041 GRENOBLE CEDEX France
Abstract
A method is presented to compute the diffraction of P, SV, and Rayleigh waves by an irregular topographic feature in an elastic half-space. It is based on an integral representation of the diffracted elastic fields in terms of single-layer boundary sources that is derived from Somigliana's identity. Introduction of boundary conditions leads to a Fredholm integral equation of the second kind for boundary sources. A discretization scheme based on the numerical and analytical integration of exact Green's functions for displacements and tractions is employed. Calculations are performed in the frequency domain and synthetic seismograms are obtained using the fast Fourier transform.
In order to give perspective on the range of effects caused by topographic anomalies, various examples that cover extreme cases are presented. It is found that topography may cause significant effects both of amplification and of deamplification at the irregular feature itself and its neighborhood, but the absolute level of amplification is generally lower than about four times the amplitude of incoming waves. Such facts must be taken into account when the spectral ratio technique is used to characterize topographical effects.
This article has been cited by other articles:
|
|
 |
|
  H. Mogi and H. Kawakami Analysis of Scattered Waves on Ground with Irregular Topography Using the Direct Boundary Element Method and Neumann Series Expansion Bulletin of the Seismological Society of America, August 1, 2007; 97(4): 1144 - 1157. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Park and E. Kausel Response of Layered Half-Space Obtained Directly in the Time Domain, Part I: SH Sources Bulletin of the Seismological Society of America, October 1, 2006; 96(5): 1795 - 1809. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
F. J. Sanchez-Sesma and M. Campillo Retrieval of the Green's Function from Cross Correlation: The Canonical Elastic Problem Bulletin of the Seismological Society of America, June 1, 2006; 96(3): 1182 - 1191. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Z. Ge, L.-Y. Fu, and R.-S. Wu P-SV Wave-Field Connection Technique for Regional Wave Propagation Simulation Bulletin of the Seismological Society of America, August 1, 2005; 95(4): 1375 - 1386. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. De Luca, S. Marcucci, G. Milana, and T. Sano Evidence of Low-Frequency Amplification in the City of L'Aquila, Central Italy, through a Multidisciplinary Approach Including Strong- and Weak-Motion Data, Ambient Noise, and Numerical Modeling Bulletin of the Seismological Society of America, August 1, 2005; 95(4): 1469 - 1481. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L.-Y. Fu Rough Surface Scattering: Comparison of Various Approximation Theories for 2D SH Waves Bulletin of the Seismological Society of America, April 1, 2005; 95(2): 646 - 663. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. Frischknecht and J.-J. Wagner Seismic Soil Effect in an Embanked Deep Alpine Valley: A Numerical Investigation of Two-Dimensional Resonance Bulletin of the Seismological Society of America, February 1, 2004; 94(1): 171 - 186. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Energy Partition and Attenuation of Regional Phases by Random Free Surface Bulletin of the Seismological Society of America, June 1, 2002; 92(5): 1992 - 2007.
|
|
|
|
|
|
C. Ortiz-Aleman, F. J. Sanchez-Sesma, J. L. Rodriguez-Zuniga, and F. Luzon Computing topographical 3D site effects using a fast IBEM/Conjugate gradient approach Bulletin of the Seismological Society of America, April 1, 1998; 88(2): 393 - 399. [Abstract] [PDF]
|
|
|
|
|
|
F. J. Chavez-Garcia, L. R. Sanchez, and D. Hatzfeld Topographic site effects and HVSR. A comparison between observations and theory Bulletin of the Seismological Society of America, October 1, 1996; 86(5): 1559 - 1573. [Abstract] [PDF]
|
|
|
|
|
|
H. Karabulut and J. F. Ferguson SH wave propagation by discrete wavenumber boundary integral modeling in transversely isotropic medium Bulletin of the Seismological Society of America, April 1, 1996; 86(2): 524 - 529. [Abstract] [PDF]
|
|
|
|
|
|
M. Bouchon, C. A. Schultz, and M. Nafi Toksoz A fast implementation of boundary integral equation methods to calculate the propagation of seismic waves in laterally varying layered media Bulletin of the Seismological Society of America, December 1, 1995; 85(6): 1679 - 1687. [Abstract] [PDF]
|
|
|
|
|
|
A. M. Dainty and C. A. Schultz Crustal reflections and the nature of regional P coda Bulletin of the Seismological Society of America, June 1, 1995; 85(3): 851 - 858. [Abstract] [PDF]
|
|
|
|
|
|
J. Gagnepain-Beyneix, J. C. Lepine, A. Nercessian, and A. Hirn Experimental study of site effects in the Fort-de-France area (Martinique island) Bulletin of the Seismological Society of America, April 1, 1995; 85(2): 478 - 495. [Abstract] [PDF]
|
|
|
|
|
|
F. J. Sanchez-Sesma and F. Luzon Seismic response of three-dimensional alluvial valleys for incident P, S, and Rayleigh waves Bulletin of the Seismological Society of America, February 1, 1995; 85(1): 269 - 284. [Abstract] [PDF]
|
|
|
|
|
|
H. Pedersen, B. Le Brun, D. Hatzfeld, M. Campillo, and P.-Y. Bard Ground-motion amplitude across ridges Bulletin of the Seismological Society of America, December 1, 1994; 84(6): 1786 - 1800. [Abstract] [PDF]
|
|
|
|
|
|
M. Bouchon and O. Coutant Calculation of synthetic seismograms in a laterally varying medium by the boundary element-discrete wavenumber method Bulletin of the Seismological Society of America, December 1, 1994; 84(6): 1869 - 1881. [Abstract] [PDF]
|
|
|
|
|
|
J. LERMO and F. J. CHAVEZ-GARCIA Site effect evaluation using spectral ratios with only one station Bulletin of the Seismological Society of America, October 1, 1993; 83(5): 1574 - 1594. [Abstract] [PDF]
|
|
|
|
|
|
R. PAOLUCCI, M. M. SUAREZ, and F. J. SANCHEZ-SESMA Fast computation of SH seismic response for a class of alluvial valleys Bulletin of the Seismological Society of America, October 1, 1992; 82(5): 2075 - 2086. [Abstract] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
