Enhancement of long period components of recorded and synthetic ground motions using InSAR

José A. Abell*, Juan Carlos de la Llera, Charles W. Wicks

*Autor correspondiente de este trabajo

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

4 Citas (Scopus)

Resumen

Tall buildings and flexible structures require a better characterization of long period ground motion spectra than the one provided by current seismic building codes. Motivated by that, a methodology is proposed and tested to improve recorded and synthetic ground motions which are consistent with the observed co-seismic displacement field obtained from interferometric synthetic aperture radar (InSAR) analysis of image data for the Tocopilla 2007 earthquake (Mw=7.7) in Northern Chile. A methodology is proposed to correct the observed motions such that, after double integration, they are coherent with the local value of the residual displacement. Synthetic records are generated by using a stochastic finite-fault model coupled with a long period pulse to capture the long period fling effect.

It is observed that the proposed co-seismic correction yields records with more accurate long-period spectral components as compared with regular correction schemes such as acausal filtering. These signals provide an estimate for the velocity and displacement spectra, which are essential for tall-building design. Furthermore, hints are provided as to the shape of long-period spectra for seismic zones prone to large co-seismic displacements such as the Nazca-South American zone.
Idioma originalInglés
Páginas (desde-hasta)817-829
Número de páginas13
PublicaciónSoil Dynamics and Earthquake Engineering
Volumen31
N.º5-6
DOI
EstadoPublicada - may. 2011

Palabras clave

  • 1999 hector mine
  • 14 november 2007
  • Tocopilla earthquake
  • Response spectra
  • Coseismic slip
  • Fault
  • Model california
  • Radar: chile

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