The simplified seismic soil classification in many countries relies on the Vs30 parameter as a proxy to the amplification factor. The pros and cons of this approach have already been extensively debated in the literature. We present an alternative subsoil seismic classification which is based on expedite geophysical field procedures (passive/active single station and multichannel surveys, all relying on surface waves analysis) aimed at determining the resonance frequencies and the very shallow Vs profile. We show how the major drawbacks of the Vs30-based classification cab ne effectively overcome. In particular, the new approach 1) brings in the concept that the site class is not a universal concept but is strictly linked to the type of structure which is planned to be built on that site, 2) introduces a shift from the ‘depth-domain’ concept (30 m or 20 m or 10 m suggested by different authors) to the ‘frequency-domain’ concept and 3) does not take into account an ‘average’ stiffness but the abrupt stiffness changes, which play a major role in seismic amplification

Seismic soil classification from a different perspective / Castellaro S.; Mulargia F.. - STAMPA. - (2011), pp. 1-4.

Seismic soil classification from a different perspective

CASTELLARO, SILVIA;MULARGIA, FRANCESCO
2011

Abstract

The simplified seismic soil classification in many countries relies on the Vs30 parameter as a proxy to the amplification factor. The pros and cons of this approach have already been extensively debated in the literature. We present an alternative subsoil seismic classification which is based on expedite geophysical field procedures (passive/active single station and multichannel surveys, all relying on surface waves analysis) aimed at determining the resonance frequencies and the very shallow Vs profile. We show how the major drawbacks of the Vs30-based classification cab ne effectively overcome. In particular, the new approach 1) brings in the concept that the site class is not a universal concept but is strictly linked to the type of structure which is planned to be built on that site, 2) introduces a shift from the ‘depth-domain’ concept (30 m or 20 m or 10 m suggested by different authors) to the ‘frequency-domain’ concept and 3) does not take into account an ‘average’ stiffness but the abrupt stiffness changes, which play a major role in seismic amplification
2011
XIV Convegno ANIDIS "L'Ingegneria Sismica in Italia"
1
4
Seismic soil classification from a different perspective / Castellaro S.; Mulargia F.. - STAMPA. - (2011), pp. 1-4.
Castellaro S.; Mulargia F.
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/124297
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact