A Shear-Wave Velocity Model in the City of Oued-Fodda (Northern Algeria) from Rayleigh Wave Ellipticity Inversion

The city of Oued-Fodda is located in north-central Algeria on the margins of the Middle-Cheliff Basin. This region has suffered several destructive earthquakes. The strongest was the 1980 El-Asnam earthquake (Ms7.3), whose causative fault was located about 1 km north of the city of Oued-Fodda. There...

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Bibliographic Details
Published in:Applied sciences 2020-03, Vol.10 (5), p.1717
Main Authors: Issaadi, Abdelouahab, Semmane, Fethi, Yelles-Chaouche, Abdelkrim, Galiana-Merino, Juan José, Layadi, Khalissa
Format: Article
Language:English
Subjects:
ambient noise
cheliff basin
Earthquake damage
Earthquakes
Ellipticity
Environmental risk
fundamental frequency
Geology
Inversion
Lying
Methods
oued-fodda
rayleigh wave ellipticity
Rayleigh waves
Resonant frequencies
Seismic activity
Seismic hazard
shear-wave velocity
Soil characteristics
Wave velocity
Wavelet transforms
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Summary:The city of Oued-Fodda is located in north-central Algeria on the margins of the Middle-Cheliff Basin. This region has suffered several destructive earthquakes. The strongest was the 1980 El-Asnam earthquake (Ms7.3), whose causative fault was located about 1 km north of the city of Oued-Fodda. Therefore, a good knowledge of the soil characteristics in this city may allow a better evaluation of the seismic risk and help to minimize damages in the future. With this objective, a detailed microzonation study of Oued-Fodda has been carried out in this study. For that, the horizontal-to-vertical spectral ratio (HVSR) method has been applied on 102 sites along the city, estimating the soil fundamental frequencies and their corresponding amplitudes. Besides, the Rayleigh wave ellipticity inversion has been accomplished in order to estimate the corresponding Vs profiles and provide two cross-sections of the geology under the city. In the central part of the city, high-frequency peaks are observed, between 12.5 and 15 Hz, which correspond to impedance contrasts at shallow depth (
ISSN:2076-3417
2076-3417
DOI:10.3390/app10051717