000010946 001__ 10946
000010946 005__ 20141205155819.0
000010946 04107 $$aeng
000010946 046__ $$k2008-10-12
000010946 100__ $$aMeireles, Helena A.
000010946 24500 $$aEstimation of Site Specific Ground Motion for the Downtown Area of Lisbon

000010946 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000010946 260__ $$b
000010946 506__ $$arestricted
000010946 520__ $$2eng$$aThe downtown area of Lisbon, Portugal, is an important historical site of the capital, which has been completely reconstructed with a typical XVIII century building after the major earthquake of 1755. The selected site is set on an alluvium filled valley of soft unconsolidated sediments where considerable seismic site amplification of ground motion is expected. Albeit the importance and susceptibility of the site, not much information is available in the literature for seismic ground site characterization. A collection of data has been made on geological, geotechnical and seismic surveys. Additional measurements of ambient vibrations have been done based on the H/V spectral ratio technique (HVSRT). Based on the combination of geological and geotechnical data with HVSRT, it was possible to characterize the alluvium site in terms of average shear wave velocity of the soil (Vs,av) and depth to bedrock (H) estimates based on the characteristic soil frequency, as well as mapping the site blocks where seismic ground amplifications are expected. The site Vs,av of the soil is estimated at ~194 m/s. Additional information can be obtained with the HVSRT. 1D structure assumption may predict the average response of the soil near the centre of the valley but will probably not at the edges. This is explained by the mapping of changes in the H/V curves, although not too strong 2D/3D effects are expected for this relatively shallow basin (H/w=0.15).

000010946 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000010946 653__ $$asite characterization, ambient vibrations, H/V ratio technique, Lisbon downtown

000010946 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000010946 720__ $$aMeireles, Helena A.$$iBento, R.
000010946 8560_ $$ffischerc@itam.cas.cz
000010946 8564_ $$s718368$$uhttps://invenio.itam.cas.cz/record/10946/files/07-0060.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 07-0060.
000010946 962__ $$r9324
000010946 980__ $$aPAPER