## 7 Conclusions
The calculated Vp/Vs ratio for the sedimentary column is 1.95. For the bedrock formations, the ratio is 1.76. The obtained velocity and resistivity profiles highlight the existence of important lateral variations in the velocity and resistivity of the whole sedimentary column. This variation is directly linked with variations in lithology (lateral change of facies), caused by different factors that have affected the sedimentation process in the Middle-Chelif Basin (marine regression and transgression episodes during the Miocene and Pliocene, erosions, faults, etc.). The sedimentary layers show a synclinal aspect in the plain of Carnot, unlike the Oued-Fodda and Ain-Defla regions, where the underground structures are rugged, affected by different faults, folds, and outcrops. The depocenters in the Middle-Chelif Basin appear to be located in a narrow band extending from the western part of the town of El-Abadia to the northern part of the town of Rouina. The maximum observed depth to bedrock is 760 m.  
The thickness of the sedimentary layers is different beneath the cities situated in the northern and southern parts of the Middle-Chelif Plain. In the city of Ain-Defla, which backs onto the northern flank of the epimetamorphic Doui Massif, the sedimentary column does not exceed 60 m. While in the cities of Oued-Fodda and El-Attaf, which were built around the western and eastern parts of the Temoulga Massif, respectively, the sedimentary column reaches a thickness of 200 m. However, the cities of Rouina, El-Abadia, and El-Amra are lying over a thick sedimentary cover that exceeds 300 m.  
The cities cited in this study extend over a region where strong earthquakes with secondary effects (liquefaction, landslides, etc.) have already occurred several times before. Therefore, this study would like to be a contribution to a better assessment of the seismic hazard in the Chelif-Basin. The results obtained in this study can be used, for example, in the modeling of strong ground motions in order to update the Algerian seismic code. **Author Contributions:** [PERSON] acquired and processed the data and wrote the paper. [PERSON] proposed the methodology and reviewed the paper. [PERSON] reviewed and supervised the paper. [PERSON] helped with array processing and reviewed the paper. [PERSON] performed the electrical prospecting. All authors have read and agreed to the published version of the manuscript. **Funding:** This study was funded by the Conselleria de Participacion, Transparencia, Cooperacion y Calidad Democratica de la Generalitat Valenciana, and by Research Group VIGROB-116 (University of Alicante). **Institutional Review Board Statement:** Not applicable. **Informed Consent Statement:** Not applicable. **Data Availability Statement:** The data presented in this study are available upon request from the corresponding author. The data are not publicly available because of their large size. **Acknowledgments:** We would like to thank [PERSON] for providing the equipment for the resistivity measurements. We also thank [PERSON] for her help with the lithological cross-sections. A special thanks to the CRAAG team that participated in field measurements: [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], and [PERSON]. **Conflicts of Interest:** The authors declare no conflict of interest.