Site Effects Assessment Using Ambient Excitations sesame european Commission – Research General Directorate Project No. Evg1-ct-2000-00026 sesame report of the wp04



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SESAME Project WP04-D20.04 H/V Technique: Empirical Evaluation

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Site Effects Assessment Using Ambient

Excitations

SESAME
European Commission – Research General Directorate

Project No. EVG1-CT-2000-00026 SESAME


Report of the
WP04
H/V Technique : Empirical Evaluation


Deliverable D20.04

Comparisons of Damage Distribution in Modern Urban Areas with Results from (H/V) Spectral Ratio

July 2004

List of Contents

Summary ........................................................................................................…..................…......…………….p.2

Acknowledgements ...................................................................................................................………………..p.2

Chapter 1: Introduction ……………………………............................................….......................……….. …..p.3

Chapter 2: Correlation between (H/V) ratio and seismic damage:The case of the city of Thessaloniki ………..p.5

Chapter 3: Correlation between (H/V) ratio and seismic damage: The case of the city of Kalamata …………..p.17

Chapter 4: Correlation between (H/V) ratio and seismic damage: The case of the city of Rome ………………p.27

Chapter 5: Correlation between (H/V) ratio and seismic damage: The case of the city of Palermo …………....p.37

Chapter 6: Correlation between (H/V) ratio and seismic damage: The case of the city of Angra-do-Heroismo. p.51

Chapter 7: Correlation between (H/V) ratio and seismic damage: The case of the city of Fabriano …………...p.61

List of Contributors (in alphabetical order)

Bordoni Paula INGV, Roma, Italy

Cara Fabrizio INGV, Roma, Italy

Cultrera Giovanna INGV, Roma, Italy

Dimitriu Petros ITSAK, Thessaloniki, Greece

Di Giulio Giuseppe INGV, Roma, Italy

Hatzidimitriou Panagiotis ITSAK/AUTH-Geolab, Thessaloniki, Greece

Lenti Luca INGV, Roma, Italy

Marra Fabrizio INGV, Roma, Italy

Marcellini Alberto CNR, Milano, Italy

Milana Giuliano INGV, Roma, Italy

Oliveira Carlos Inst. Superior Tecnico, Lisbon, Portugal

Pagani Marco CNR, Milano, Italy

Panou Areti ITSAK, Thessaloniki, Greece

Papazachos Costas ITSAK/AUTH-Geolab, Thessaloniki, Greece

Rovelli Antonio INGV, Roma, Italy

Savvaidis Alexandros ITSAK, Thessaloniki, Greece

Senos M. Luisa Inst. Meteorology, Lisbon, Portugal

Tento Alberto CNR, Milano, Italy

Tertulliani Andrea INGV, Roma, Italy

Teves-Costa Paula ICTE/UL, Lisbon, Portugal

Theodulidis Nikos ITSAK, Thessaloniki, Greece



Project coordinator: Pierre-Yves Bard LGIT, Grenoble, France

Task A Leader: Kuvvet Atakan UiB, Bergen, Norway

WP04 Leader: Nikos Theodulidis ITSAK, Thessaloniki, Greece



Summary

In this Report comparisons of seismic damage distribution with the (H/V) spectral ratio results is attempted, under the framework of the SESAME Project (Site Effects Assessment Using Ambient Excitations, EC-RGD, Project No. EVG1-CT-2000-00026 SESAME), Task A (H/V technique), Work Package 04 (WP04– H/V Technique: Empirical Evaluation).


Acknowledgements

This project (Project No. EVG1-CT-2000-00026 SESAME) is supported by the European Commission – Research General Directorate. We thank all the technical personnel from all the participating institutions, who have helped in data collection.

Chapter 1: Introduction

The aim of the WP04 is - parallel to the theoretical and numerical analyses - to achieve a purely empirical, experimental assessment of the meaning of the horizontal to vertical component spectral ratio (H/V ratio) based on ambient noise measurements, in order to answer the following questions:




  • Does H/V ratio provide a reliable estimate of the fundamental frequency at a given site ?

  • Does H/V ratio indicate the frequency band over which the ground motion is amplified ?

  • Does H/V ratio provide a quantitative estimate of the corresponding amplification or a lower bound estimate ?

  • Can we learn anything about the limitations in noise H/V technique related to non-linear soil behavior ?

  • How does H/V spectral ratio compare with damage distribution in modern cities ?

The basic work of the WP consist in comparing the site effect estimates obtained with classical, well accepted methods (site to reference spectral ratio on earthquake recordings) with H/V noise and earthquake ratios obtained at the same sites. To accomplish this task all available data within the consortium decided to be compiled in order to analyse them in a common and homogeneous way. All the partners have agreed and provided their earthquake and noise recordings obtained for site effect estimation at many different sites throughout Europe and elsewhere to the task leader. In addition, some more noise recordings have been acquired at sites where site effects have been reliably estimated, in particular, at numerous strong motion sites where strong motion recordings are available. After the noise recordings compiled they processed with the technique developed and agreed upon in Work Package 3 of the SESAME project.

Then the experimental (H/V) spectral ratios were compared with seismic damage distribution in six modern cities of Europe, namely, Thessaloniki, Kalamata (Greece), Rome, Fabrianno, Palermo (Italy), and Angra-do-Heroismo (Portugal). Qualitative and quantitative correlation of (H/V) specral ratio characteristics [fundamental frequency, corresponding amplitude] was attempted and showed from good, to fuzzy and to no-correlation, indicating thus the complex character of the parameters involved.
In this Report [“Comparisons of Damage Distribution in Modern Urban Areas with Results from (H/V) Spectral Ratio” , Deliverable D20.04] experimental (H/V) spectral ratio characteristics with seismic damage distribution for six modern European cities are compared. This sub-task started at the 28th month and the final Report integrated at the 39th month of the project. There was a shift / delay of about 10 months in the final Deliverable submission [see next diagram of Milestones and Expected Results]. This delay is due to the following reasons:


  1. Additional data, enriched the SESAME noise/earthquake recordings database and consequently caused a time shift in converting existing data set from various formats to SAF.




  1. The JSESAME software development integrated with a certain delay.



  1. For a number of sites noise measurements were repeated due to “bad” noise recordings initially acquired.

WP04 - H/V Technique: Empirical Evaluation

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