Ground-Motion Simulation in the Lower Tagus Valley Basin

详细信息    查看全文

• 作者：J. F. Borges ; M. Bezzeghoud ; B. Caldeira ; Jo?o Carvalho
• 刊名：Pure and Applied Geophysics
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：172
• 期：9
• 页码：2411-2420
• 全文大小：3,012 KB
• 参考文献：Bensaude , A. (1910). Le Tremblement de Terre de la Vallee du Tage du 23 Avril 1909 (Note prelim- inaire), Extrait du Bull. de Ia Soc. Portugaise des Sciences Naturelles -Tome IV -fasc 2-, Lisbonne, Imprimerie Typ. de Ia Librairie Ferin, Lisbon.
  Bezzeghoud , M., Borges , J.F., and Caldeira , B. 2011. Ground Motion Simulations of the SW Iberia Margin: Rupture Directivity and Earth Structure Effects. Natural Hazard 69, 2, 1229-245.
  Beresnev , I. A. and G. M. Atkinson (1997). Modeling finite-fault radiation from the omega**n spectrum, Bulletin of the Seismological Society of America 87, 67-4.
  Borges , J. F., Fitas , A. J. S., Bezzeghoud , M. & Teves - Costa , P. (2001). Seismotectonics of Portugal and its adjacent Atlantic area. Tectonophysics 337, 373-87.
  Borges , J. F; Silva , H.G.; Torres , R.J.G.; Caldeira , B.; Bezzeghoud , M. Furtado , J. A. and Carvalho , J, 2015. Inversion of ambient seismic noise HVSR to evaluate velocity and structural models of the Lower Tagus Basin, Portugal. submitted to Seismological Research Letters.
  Brune J.N., 1970. Tectonic stress and spectra of seismic shear waves. J Geophys Res, 75: 4997-009
  Cabral , J., Moniz , C., Ribeiro , P., Terrinha , P., Matias , L., 2003. Analysis of seismic reflection data as a tool for the seismotectonic assessment of a low activity intraplate basin—the Lower Tagus Valley (Portugal). Journal of Seismology 7, 431-47.
  Cabral , J., Ribeiro , P., Figueiredo , P., Pimentel , N., Martins , A., 2004. The Azambuja fault: an active structure located in an intraplate basin with significant seismicity (Lower Tagus Valley, Portugal). Journal of Seismology, 8, 347-62.
  Carvalho , J., Cabral , J., Gon?alves , R., Torres , L., and Mendes -Victor , L., 2006. Geophysical methods applied to fault characterization and earthquake potential assessment in the Lower Tagus Valley, Portugal, Tectonophysics, 418, 277-97
  Carvalho , A., Zonno , G., Franceschina , G., Bilé Serra J. and Campos Costa , A., 2008, Earthquake shaking scenarios for the metropolitan area of Lisbon. Soil Dynamics and Earthquake Engineering, 28, 347-64.
  Carvalho , J., Matias , H., Rabeh , T., Menezes , P., Barbosa , V., Dias , R., Carrilho , F., 2012, Connecting Onshore Structures in the Algarve with the southern Portuguese continental margin: The Carcavai Fault Zone. Tectonophysics, 570-571, 151-162, DOI: 10.1016/j.tecto.2012.08.011.
  Carvalho , J., Rabeh , T., Dias , R., Dias , R., Pinto , C.C., Oliveira , T., Cunha , T. and Borges , J.F. (2014) Tectonic and Neotectonic Implications of a New Basement Map of the Lower Tagus Valley, Portugal. Tectonophysics, 617, 88-00. http://?dx.?doi.?org/-0.-016/?j.?tecto.-014.-1.-17 .
  Grandin , R., Borges , J.F., Bezzeghoud , M., Caldeira , B. and Carrilho , F., 2007a, Simulations of strong ground motion in SW Iberia for the 1969 February 28 (MS?=?8.0) and the 1755 November 1 (M?~?8.5) earthquakes -I. Velocity model, Geophys. J. Int., 171, 3, 1144-161. doi:10.-111/?j.-365-246X.-007.-3570.?x.-/span>
  Grandin , R., Borges , J.F., Bezzeghoud , M., Caldeira , B. And Carrilho , F., 2007b, Simulations of strong ground motion in SW Iberia for the 1969 February 28 (MS?=?8.0) and the 1755 November 1 (M?~?8.5) earthquakes -II. Strong ground motion simulations, Geophys. J. Int., 171, 2, 807-22, November 2007.doi:10.-111/?j.-365-246X.-007.-357.?x
  Hartzell , S., Leeds , A., Frankel , A., Williams , R.A., Odum , J., Stephenson , W., and Silva , W. (2002). Simulation of broadband ground motion including nonlinear soil effects for a magnitude 6.5 earthquake on the seattle fault, Seattle, Washington, BSSA, 92, 2, 831-53. doi:10.-785/-120010114 .
  Hartzell , S., Harmsen , S., Williams , R.A., Carver , D., Frankel , A., Choy , G., Liu , P.-C., Jachens , R.C., Brocher , T.M., and Wentworth , C.M. 2006. Modeling and Validation of a 3D Velocity Structure for the Santa Clara Valley, California, for Seismic-Wave Simulations, Bull. Seism. Soc. Am., 9, 5, 1851-881. doi:10.-785/-120050243
  Henriques , M.C., Mouzinho , M.T. and Ferr?o , N.M. 1988. Sismicidade de Portugal. O Sismo de 26 de Janeiro de 1531. Comiss?o para o Catálogo Sísmico Nacional, Lisbon, 100?pp.
  Justo JL and Salwa C (1998). The 1531 Lisbon earthquake. Bull. Seismol. Soc. America, 88, 319-28.
  Larsen , S.C. & Schultz , C.A., 1995. ELAS3D, 2D/3D Elastic Finite-Difference Wave Propagation Code, Lawrence Livermore National Laboratory, UCRLMA-121792, 18?pp.
  Le Goff B., Borges J.F. and Bezzeghoud M. (2014). Intensity-Distance attenuation laws for the Portugal mainland using intensity data points, Geophysical Journal International, 199, 1278-285. doi:10.-093/?gji/?ggu317 .
  Levander , A.R., 1988. Fourth-order finite-difference P-SV seismograms, Geophysics, 53, 1425-436.
  Madariaga R (1976) Dynamics of an expanding circular fault. Bull Seismol Soc Am, 66, 3, 639-66
  Miranda , J., Batlló , J., Ferreira , H., Matias , L.M., and Baptis
• 作者单位：J. F. Borges (1)
  M. Bezzeghoud (1)
  B. Caldeira (1)
  Jo?o Carvalho (2)
  
  1. Departamento de Física and Instituto de Ciências da Terra, Escola de Ciências e Tecnologia, Universidade de évora, Rua Rom?o Ramalho, 59, 7002-554, évora, Portugal
  2. Laboratório Nacional de Energia e Geologia, Lisboa, Portugal
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  
• 出版者：Birkh盲user Basel
• ISSN：1420-9136

文摘

Throughout history, the Lower Tagus Valley (LTV) region has been shaken by several earthquakes, including some with moderate to large magnitudes and with sources located inside the basin, for example the 1344 (M6.0) and 1909 (M6.0) earthquakes. Previous simulations (Bezzeghoud et al. Natural Hazard 69: 1229-245, 2011) have revealed strong amplification of the amplitude waves in the region, because of the effect of the low-velocity sediments that fill the basin. The model used in those simulations was updated in this work by including new high-resolution geophysical and geotechnical data available for the area (seismic reflection, aeromagnetic, gravimetric, deep wells, standard penetration tests, and geological data). To contribute to improved assessment of seismic hazard in the LTV, we simulated propagation of seismic waves produced by moderate earthquakes in a 3D heterogeneous medium by using elastic finite-difference wave propagation code. The method, successfully used by Grandin et al. (Geophys J Int 171: 1144-161, 2007), involves evaluation of the seismic potential of known faults in the area studied and three-dimensional seismic ground motion modelling by use of finite difference methods. On the basis of this methodology, we calculated the ground motion for the April 23, 1909, Benavente (Portugal) earthquake (Mw = 6.0) in dense grid points, then computed the synthetic isoseismic map of the area by use of appropriate relationships between seismic intensity (MMI) and peak ground velocity (PGV). The synthetic results, in contrast with available macroseismic and instrumental data, enable validation of the source models proposed for the area, identification of the sources of historical earthquakes, and could also indicate which areas are more exposed to seismic ground motion.