Publication Date:
2020-11-30
Description:
Buildings close to each other can perform different behaviour despite its similar seismic
vulnerability. This effect is mainly due to the local seismic response connected to the
characteristics of the shallow soil layers, especially when we move away from the epicentral
area and the near field motion reduces its importance among the total amount of shaking. In
this paper we show some results of the microzonation project of the Avezzano municipality, a
town located in the southwestern portion of the Abruzzi region, which experienced the severe
effects of the January 13th, 1915 M 7.0 earthquake. Starting from a particularly detailed
knowledge of the geological characteristics of outcropping lithologies and inferring the trend
of subsoil geometries, we explored the role played by the near-surface geology in causing
variability of the ground motion by analysing a large database of earthquakes and microtremor
recordings acquired by temporary seismological networks using classical site-reference and
non-reference spectral techniques. Based on the obtained results we can seismically
characterize all the municipal territory not only in terms of fundamental resonance frequency,
useful in drawing maps of seismic microzonation and design geological sections, but also of
amplification factors helpful in verifying numerical modelling of seismic response as required
by national microzonation guidelines. We have also found many criticisms that need a more
detailed analysis in order to establish the cause of these anomalies.
Description:
Published
Description:
1153-1157
Description:
5T. Sismologia, geofisica e geologia per l'ingegneria sismica
Keywords:
Microzonation
;
Site response
;
Spectral techniques
;
Seismic amplification
;
04.06. Seismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
book chapter
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