BEM analysis of seismic wave amplification in Caracas

J. F. Semblat; P. Dangla; A. M. Duval

BEM analysis of seismic wave amplification in Caracas

J. F. Semblat, P. Dangla, A. M. Duval

Service de Mathématiques, Laboratoire Central des Ponts et Chaussees

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The main purpose of the paper is the analysis of seismic site effects in Caracas (Venezuela). The analysis is performed considering the Boundary Element Method and is compared with experimental results (damage of real earthquakes, in situ microtremors measurements). A numerical model including a part of the local topography is considered, it involves an homogeneous alluvial deposit on an elastic bedrock. The amplification of seismic motion (SH-waves) is analyzed in terms of level, occuring frequency and location. In this specific site of Caracas, the amplification factor is found to reach a maximum value of 25. Site effects occur in the thickest part of the bassin for low frequencies (below 1.0 Hz) and in two intermediate thinner areas for frequencies above 1.0 Hz. The influence of incidence is also investigated. A comparison with H/V ratio obtained from microtremor records is presented afterwards. The analysis of the damages observed in Caracas after the strong 1967 earthquake are also compared with the numerical results (amplification level and location). The results of both numerical and experimental approaches are in good agreement in terms of frequency and location of maximum amplification. The boundary element method appears to be a reliable and efficient approach for the analysis of seismic site effects.

Original language	English
Title of host publication	Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.
Editors	G. N. Pande, S. Pietruszczak, H. F. Schweiger
Publisher	A. A. Balkema
Pages	275-280
Number of pages	6
ISBN (Print)	9058090957, 9789058090959
Publication status	Published - 1 Jan 1999
Externally published	Yes
Event	Proceeding of the 1999 seventh international symposium on numerical models in geomechanics, NUMOG VII - Duration: 1 Sept 1999 → 3 Sept 1999

Publication series

Name	Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.

Conference

Conference	Proceeding of the 1999 seventh international symposium on numerical models in geomechanics, NUMOG VII
Period	1/09/99 → 3/09/99

Cite this

Semblat, J. F., Dangla, P., & Duval, A. M. (1999). BEM analysis of seismic wave amplification in Caracas. In G. N. Pande, S. Pietruszczak, & H. F. Schweiger (Eds.), Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999. (pp. 275-280). (Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.). A. A. Balkema.

Semblat, J. F. ; Dangla, P. ; Duval, A. M. / BEM analysis of seismic wave amplification in Caracas. Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.. editor / G. N. Pande ; S. Pietruszczak ; H. F. Schweiger. A. A. Balkema, 1999. pp. 275-280 (Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.).

@inproceedings{14cdc945c852428a83f7125beb373e74,

title = "BEM analysis of seismic wave amplification in Caracas",

abstract = "The main purpose of the paper is the analysis of seismic site effects in Caracas (Venezuela). The analysis is performed considering the Boundary Element Method and is compared with experimental results (damage of real earthquakes, in situ microtremors measurements). A numerical model including a part of the local topography is considered, it involves an homogeneous alluvial deposit on an elastic bedrock. The amplification of seismic motion (SH-waves) is analyzed in terms of level, occuring frequency and location. In this specific site of Caracas, the amplification factor is found to reach a maximum value of 25. Site effects occur in the thickest part of the bassin for low frequencies (below 1.0 Hz) and in two intermediate thinner areas for frequencies above 1.0 Hz. The influence of incidence is also investigated. A comparison with H/V ratio obtained from microtremor records is presented afterwards. The analysis of the damages observed in Caracas after the strong 1967 earthquake are also compared with the numerical results (amplification level and location). The results of both numerical and experimental approaches are in good agreement in terms of frequency and location of maximum amplification. The boundary element method appears to be a reliable and efficient approach for the analysis of seismic site effects.",

author = "Semblat, \{J. F.\} and P. Dangla and Duval, \{A. M.\}",

year = "1999",

month = jan,

day = "1",

language = "English",

isbn = "9058090957",

series = "Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.",

publisher = "A. A. Balkema",

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editor = "Pande, \{G. N.\} and S. Pietruszczak and Schweiger, \{H. F.\}",

booktitle = "Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.",

note = "Proceeding of the 1999 seventh international symposium on numerical models in geomechanics, NUMOG VII ; Conference date: 01-09-1999 Through 03-09-1999",

}

Semblat, JF, Dangla, P & Duval, AM 1999, BEM analysis of seismic wave amplification in Caracas. in GN Pande, S Pietruszczak & HF Schweiger (eds), Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.. Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999., A. A. Balkema, pp. 275-280, Proceeding of the 1999 seventh international symposium on numerical models in geomechanics, NUMOG VII, 1/09/99.

BEM analysis of seismic wave amplification in Caracas. / Semblat, J. F.; Dangla, P.; Duval, A. M.
Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.. ed. / G. N. Pande; S. Pietruszczak; H. F. Schweiger. A. A. Balkema, 1999. p. 275-280 (Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - BEM analysis of seismic wave amplification in Caracas

AU - Semblat, J. F.

AU - Dangla, P.

AU - Duval, A. M.

PY - 1999/1/1

Y1 - 1999/1/1

N2 - The main purpose of the paper is the analysis of seismic site effects in Caracas (Venezuela). The analysis is performed considering the Boundary Element Method and is compared with experimental results (damage of real earthquakes, in situ microtremors measurements). A numerical model including a part of the local topography is considered, it involves an homogeneous alluvial deposit on an elastic bedrock. The amplification of seismic motion (SH-waves) is analyzed in terms of level, occuring frequency and location. In this specific site of Caracas, the amplification factor is found to reach a maximum value of 25. Site effects occur in the thickest part of the bassin for low frequencies (below 1.0 Hz) and in two intermediate thinner areas for frequencies above 1.0 Hz. The influence of incidence is also investigated. A comparison with H/V ratio obtained from microtremor records is presented afterwards. The analysis of the damages observed in Caracas after the strong 1967 earthquake are also compared with the numerical results (amplification level and location). The results of both numerical and experimental approaches are in good agreement in terms of frequency and location of maximum amplification. The boundary element method appears to be a reliable and efficient approach for the analysis of seismic site effects.

AB - The main purpose of the paper is the analysis of seismic site effects in Caracas (Venezuela). The analysis is performed considering the Boundary Element Method and is compared with experimental results (damage of real earthquakes, in situ microtremors measurements). A numerical model including a part of the local topography is considered, it involves an homogeneous alluvial deposit on an elastic bedrock. The amplification of seismic motion (SH-waves) is analyzed in terms of level, occuring frequency and location. In this specific site of Caracas, the amplification factor is found to reach a maximum value of 25. Site effects occur in the thickest part of the bassin for low frequencies (below 1.0 Hz) and in two intermediate thinner areas for frequencies above 1.0 Hz. The influence of incidence is also investigated. A comparison with H/V ratio obtained from microtremor records is presented afterwards. The analysis of the damages observed in Caracas after the strong 1967 earthquake are also compared with the numerical results (amplification level and location). The results of both numerical and experimental approaches are in good agreement in terms of frequency and location of maximum amplification. The boundary element method appears to be a reliable and efficient approach for the analysis of seismic site effects.

M3 - Conference contribution

AN - SCOPUS:0033428421

SN - 9058090957

SN - 9789058090959

T3 - Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.

SP - 275

EP - 280

BT - Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.

A2 - Pande, G. N.

A2 - Pietruszczak, S.

A2 - Schweiger, H. F.

PB - A. A. Balkema

T2 - Proceeding of the 1999 seventh international symposium on numerical models in geomechanics, NUMOG VII

Y2 - 1 September 1999 through 3 September 1999

ER -

Semblat JF, Dangla P, Duval AM. BEM analysis of seismic wave amplification in Caracas. In Pande GN, Pietruszczak S, Schweiger HF, editors, Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.. A. A. Balkema. 1999. p. 275-280. (Numerical models in geomechanics. Proceedings of the 7th international symposium, Graz, September 1999.).

BEM analysis of seismic wave amplification in Caracas

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