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dc.contributor.author
Adly, Ashraf
dc.contributor.author
Poggi, Valerio
dc.contributor.author
Fäh, Donat
dc.contributor.author
Hassoup, Awad
dc.contributor.author
Omran, Awad
dc.date.accessioned
2022-08-04T07:06:45Z
dc.date.available
2017-10-06T02:55:55Z
dc.date.available
2017-10-17T09:25:24Z
dc.date.available
2022-08-04T07:06:45Z
dc.date.issued
2017-07
dc.identifier.issn
0956-540X
dc.identifier.issn
1365-246X
dc.identifier.other
10.1093/gji/ggx176
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/191208
dc.identifier.doi
10.3929/ethz-b-000191208
dc.description.abstract
The geology at Kottamiya, Rehab City and Zahraa–Madinat–Nasr to the East of Cairo (Egypt) is composed of low-velocity sediments on top of a rigid rock basement. Such sediments include the loose sands of the Gebel Ahmar formation, marl and shales of Maadi formation, in addition to sparse quaternary soil covers. Due to the contrast of the seismic impedance with the underlying bedrock, these soft sediments have the potential of considerably amplifying the ground motion during an earthquake. For the evaluation of site-specific seismic hazard, we computed the seismic site response in these areas by developing 1-D velocity models and derived average seismic velocities, including Vs30. To do that, we applied different active and passive source techniques, including the horizontal to vertical Fourier spectral ratio of ambient vibration recordings and multichannel analysis of artificially generated surface waves. A set of models representing the velocity structure of the site is then obtained by combined inversion of Rayleigh wave dispersion curves and ellipticity functions. While dispersion curves are used to constrain the uppermost low-velocity part of the soil profile, ellipticity helps in resolving the structure at the depth of the sediment–bedrock interface. From the retrieved velocity models, numerical ground-motion amplification is finally derived using 1-D SH-wave transfer function. We account for uncertainty in amplification by using a statistical model that accounts for the misfit of all the inverted velocity profiles. The study reveals that the different sites experience an important frequency-dependent amplification, with largest amplification occurring at the resonance frequencies of the sites. Amplification up to a factor of 5 is found, with some variability depending on the soil type (Vs30 ranges between 340 and 415 m s−2). Moreover, amplification is expected in the frequency range that is important for buildings (0.8–10 Hz), which is additional confirmation for the need of microzonation analysis of the area. The obtained results will be used for the development of a new seismic hazard model.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Oxford University Press
en_US
dc.rights.uri
http://rightsstatements.org/page/InC-NC/1.0/
dc.subject
Joint inversion
en_US
dc.subject
Seismic noise
en_US
dc.subject
Site effects
en_US
dc.title
Combining active and passive seismic methods for the characterization of urban sites in Cairo, Egypt
en_US
dc.type
Journal Article
dc.rights.license
In Copyright - Non-Commercial Use Permitted
dc.date.published
2017-04-28
ethz.journal.title
Geophysical Journal International
ethz.journal.volume
210
en_US
ethz.journal.issue
1
en_US
ethz.journal.abbreviated
Geophys. j. int.
ethz.pages.start
428
en_US
ethz.pages.end
442
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.
en_US
ethz.identifier.wos
ethz.publication.place
Oxford
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00003 - Schulleitung und Dienste::00022 - Bereich VP Forschung / Domain VP Research::02818 - Schweiz. Erdbebendienst (SED) / Swiss Seismological Service (SED)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00003 - Schulleitung und Dienste::00022 - Bereich VP Forschung / Domain VP Research::02818 - Schweiz. Erdbebendienst (SED) / Swiss Seismological Service (SED)
ethz.date.deposited
2017-10-06T02:55:57Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-10-17T09:25:25Z
ethz.rosetta.lastUpdated
2020-02-15T08:03:33Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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