Repository logo
 
Publication

An approach for the estimation of the magnitude of historical earthquakes: a sensitivity study of the 1980 and 1998 earthquakes in Azores

2020-10Conference object Open Access
Simple item page
dc.contributor.authorDe Azevedo Charters Fuentes Morais, Eduardo José
dc.contributor.authorFerreira, Tiago Miguel
dc.contributor.authorEstêvão, João M. C.
dc.contributor.authorOliveira, Carlos Sousa
dc.date.accessioned2020-10-12T13:34:04Z
dc.date.available2020-10-12T13:34:04Z
dc.date.issued2020-10
dc.description.abstractIn regions with low-to-moderate seismicity, the return-period of seismic events with large magnitudes is relatively high. Nevertheless, historical seismic events are relevant for the evaluation of seismic hazard in those regions. Thus, seismologists study the records of the effects of historical earthquakes to map the distribution intensity points, using an Intensity Scale. Afterwards, the maximum intensity point is identified as well as the probable epicentral location and magnitude. Another method, introduced by earthquake engineers, incorporates the knowledge of the behaviour of structures into posterior distributions of magnitude using fragility functions and the damage reported in historical documents. The method uses the total probability theorem to combine the uncertainty in the structural behaviour, ground motion intensity, site-to-source distance. Then, the Bayes’s theorem is employed to update a prior magnitude model into a posterior magnitude distribution. Thus, the reduction of the uncertainty in the final estimates requires the preliminary application of the method to instrumental events in order to validate the appropriate framework to address historical seismicity, namely ground motion and structural response. This paper investigates the earthquakes of January 1st 1980 with Mw=6.8-7.2 and of July 9th 1998 with Mw=5.9-6.2 in Azores Islands (Portugal) as study cases to test the sensitivity to different attenuation models Ambraseys et al. (2005) and Akkar et al. (2014). A single set of fragility functions, derived from a detailed vulnerability assessment in Faial, is assumed to model the structural response in both events. The results show that, for both events, the attenuation model from Akkar et al. (2014) and the fault source model presented results closer to those of detailed methods. Discrepancies can also be explained by differences in the prior distance model resulting from source models assumptions. The intervals Mw=5.96±0.53 and Mw=6.91±0.42 have been estimated for the 1998 and the 1980 earthquake, respectively.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationEduardo Charters Morais; Tiago Miguel Ferreira; Estêvão, João M. C.; Carlos Sousa Oliveira. "An Approach for the Estimation of the Magnitude of Historical Earthquakes: a sensitivity study of the 1980 and 1998 Earthquakes in Azores". International Meeting 40 Years of the 1980 Azores Earthquake, p.40-43, 2020.pt_PT
dc.identifier.isbn978-972-778-168-3
dc.identifier.urihttp://hdl.handle.net/10400.1/14760
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherUniversidade de Évorapt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectFragility functionspt_PT
dc.subjectHistorical seismicitypt_PT
dc.subject1998 earthquakept_PT
dc.subject1980 earthquakept_PT
dc.titleAn approach for the estimation of the magnitude of historical earthquakes: a sensitivity study of the 1980 and 1998 earthquakes in Azorespt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.citation.endPage44pt_PT
oaire.citation.startPage40pt_PT
oaire.citation.titleInternational Meeting 40 Years of the 1980 Azores Earthquakept_PT
person.familyNamede Azevedo Charters Fuentes Morais
person.familyNameFerreira
person.familyNameEstêvão
person.familyNameOliveira
person.givenNameEduardo José
person.givenNameTiago Miguel
person.givenNameJoão Manuel Carvalho
person.givenNameCarlos
person.identifier163756
person.identifierLh0jYe0AAAAJ&hl
person.identifier.ciencia-idD21E-0392-9F2A
person.identifier.ciencia-id001A-8761-A164
person.identifier.ciencia-id2E1F-3EC3-C04A
person.identifier.orcid0000-0002-4341-3513
person.identifier.orcid0000-0001-6454-7927
person.identifier.orcid0000-0002-7356-9893
person.identifier.orcid0000-0002-5967-7126
person.identifier.ridD-8112-2015
person.identifier.ridN-3525-2013
person.identifier.scopus-author-id57191280728
person.identifier.scopus-author-id55509289200
person.identifier.scopus-author-id56268965500
person.identifier.scopus-author-id7202422562
rcaap.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
relation.isAuthorOfPublication6aa46adc-3dc2-4ecc-96b1-aea39fe77b3d
relation.isAuthorOfPublication5303fd30-9e5f-47db-986f-b4ef91d69db7
relation.isAuthorOfPublication39e5f28b-fdf6-4823-b622-87f4177dd013
relation.isAuthorOfPublication66e2ac6d-45b4-4e31-845b-fb39eaeb44c0
relation.isAuthorOfPublication.latestForDiscovery6aa46adc-3dc2-4ecc-96b1-aea39fe77b3d

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
An Approach for the Estimation of the Magnitude of Historical Earthquakes.pdf
Size:
789.43 KB
Format:
Adobe Portable Document Format
Download

Collections

ISE4-Vários