Large-Scale Seismic Vulnerability Assessment Method for Urban Centres. An Application to the City of Florence

Ripepe, Maurizio; Lacanna, Giorgio; Deguy, Pauline Isabelle; Stefano, Mario De; Mariani, Valentina; Tanganelli, Marco

doi:10.4028/www.scientific.net/kem.628.49

Cited by 10 publications

(9 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For its elevation characteristics, the most affected area in 1966 was the Santa Croce neighbourhood (outside the study area), with flood depths of the order of 4-5 m. The ancient nucleus of the city (the study area) was also affected with water depths lower than 2 m, according to the elevation of historical marble plates. Although the seismic and flood risks in the city of Florence have been separately investigated in the past, they have been carried out at different spatial scales or excluded this portion of the historical city (D'Agostino et al, 2019;Arrighi et al 2018;Ripepe et al 2018Ripepe et al , 2015Matassoni et al 2017;SISMED 2016, Lacanna et al 2016.…”

Section: Earthquakes and Floods In Florencementioning

confidence: 99%

Multi-risk assessment in a historical city

et al. 2022

View full text Add to dashboard Cite

Natural hazards pose a significant threat to historical cities which have an authentic and universal value for mankind. This study aims at codifying a multi-risk workflow for seismic and flood hazards, for site-scale applications in historical cities, which provides the Average Annual Loss for buildings within a coherent multi-exposure and multi-vulnerability framework. The proposed methodology includes a multi-risk correlation and joint probability analysis to identify the role of urban development in re-shaping risk components in historical contexts. The workflow is unified by exposure modelling which adopts the same assumptions and parameters. Seismic vulnerability is modelled through an empirical approach by assigning to each building a vulnerability value depending on the European Macroseismic Scale (EMS-98) and modifiers available in literature. Flood vulnerability is modelled by means of stage-damage curves developed for the study area and validated against ex-post damage claims. The method is applied to the city centre of Florence (Italy) listed as UNESCO World Heritage site since 1982. Direct multi-hazard, multi-vulnerability losses are modelled for four probabilistic scenarios. A multi-risk of 3.15 M€/year is estimated for the current situation. In case of adoption of local mitigation measures like floodproofing of basements and installation of steel tie rods, multi-risk reduces to 1.55 M€/yr. The analysis of multi-risk correlation and joint probability distribution shows that the historical evolution of the city centre, from the roman castrum followed by rebuilding in the Middle Ages, the late XIX century and the post WWII, has significantly affected multi-risk in the area. Three identified portions of the study area with a different multi-risk spatial probability distribution highlight that the urban development of the historical city influenced the flood hazard and the seismic vulnerability. The presented multi-risk workflow could be applied to other historical cities and further extended to other natural hazards.

show abstract

Section: Earthquakes and Floods In Florencementioning

confidence: 99%

Multi-risk assessment in a historical city

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Il presente studio propone una metodologia per la valutazione della vulnerabilità sismica urbana della città di Firenze attraverso l'uso della tecnologia GIS allo scopo di creare un sistema informativo del patrimonio edilizio (residenziale, pubblico e produttivo) e sulla popolazione (residente o turistica). I dati sono stati ottenuti da studi precedenti sulla geologia e la sismologia dell'area , da ISTAT e altri strati informativi messi a disposizione dal Comune di Firenze oltre che da rilievi sismici in-situ su un campione rappresentativo dell'edificato fiorentino al fine di definirne il periodo naturale di oscillazione (Ripepe et al 2015).…”

Section: Introduzioneunclassified

Geodatabase per la valutazione speditiva a larga scala della vulnerabilità sismica di un’area urbana complessa: applicazione alla città di Firenze

Deguy

Ripepe

Lacanna

et al. 2022

BSGI

Self Cite

View full text Add to dashboard Cite

The seismic vulnerability assessment of a city is usually based on buildings’ characteristics, underground geophysical properties, socio-economic activities, and population density. This research highlights the value of a complete and manageable database for large-scale seismic vulnerability assessment of urban areas: such databases are often missing or partially developed for the majority of Italian cities. This study is based on the creation of a GIS database containing useful information to identify and valuate some indicators of seismic vulnerability in order to understand an earthquake’s effect for the actual configuration of a city. This system could be a growing source of information on cities and, if used in the proper way, a useful tool for monitoring, for seismic vulnerability assessment, and for spatial urban planning. The experience gained in this field of application can be transferred to other situations, both for the procedures and the workflow system.

show abstract

“…The recent seismic activity in the northern Apennines, and the destructive earthquakes that affected Tuscany in the previous millennium, would suggest to shed light on its seismotectonic pattern. Moreover, one should also consider the potentially involved population (over 3.7 million inhabitants) and the vulnerability of the huge cultural heritage housed in cities such as Florence, Pisa, Siena and many other smaller towns [7].…”

Section: Introductionmentioning

confidence: 99%

Active Tectonics in Tuscany (Central Italy): Ten Years of Seismicity (2009-2019)

Viti¹

2020

IJG

View full text Add to dashboard Cite

Strong earthquakes (moment magnitude M W ≥ 5.5) are uncommon in Tuscany and surroundings (central Italy). The last strong seismic event occurred a century ago (September 7, 1920 Garfagnana, M W = 6.53). The paucity of seismic instrumental recordings hinders the identification of the tectonic regime active in Tuscany. On the other hand, the geological and geomorphological pieces of evidence collected so far, concerning potential active and capable faults, are scarce, fragmentary and ambiguous. In this work I shed light on the active deformation of Tuscany by using two independent approaches: earthquake source mechanisms and GNSS (GPS) geodetic measurements. I have considered 41 small seismic events (M W ≤ 5.1) that occurred in the study area during the last decade. The related source mechanisms (retrieved by the Time Domain Moment Tensor method) define a relatively clear picture of the active deformation: extension along the northern Apennine watershed and strike-slip regime within inner Tuscany, up to the Tyrrhenian coast. This pattern broadly agrees with the horizontal strain field reconstructed by the geodetic velocity field. The latter has been constrained by a network of 840 GPS stations located in Italy and neighboring countries, operating in the last 20 years.

show abstract

Large-Scale Seismic Vulnerability Assessment Method for Urban Centres. An Application to the City of Florence

Cited by 10 publications

References 6 publications

Multi-risk assessment in a historical city

Multi-risk assessment in a historical city

Geodatabase per la valutazione speditiva a larga scala della vulnerabilità sismica di un’area urbana complessa: applicazione alla città di Firenze

Active Tectonics in Tuscany (Central Italy): Ten Years of Seismicity (2009-2019)

Contact Info

Product

Resources

About