Crustal structure beneath Kottamiya broadband station,northern Egypt,from analysis of teleseismic receiver functions |
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| Institution: | 1. Department of Land Surveying and Geo-Informatics, Hong Kong Polytechnic University, Hong Kong;2. School of Geomatics Science and Technology, Nanjing Tech University, Nanjing, China |
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| Abstract: | We analyzed a total of 206 receiver functions beneath Kottamiya broadband station in northern Egypt to study the crustal structure and any azimuthal variations in the crustal thickness. The computed receiver functions are subdivided according to their azimuth into eight subgroups and analyzed separately using a genetic algorithm. The genetic algorithm is more appropriate than conventional linearized inversion schemes in regions where there is little a priori information about local crustal structures such as northern Egypt because it does not strongly depend on an initial model. The study region is located on the unstable shelf of Egypt in the northeastern corner of Africa. Little information about the deep structure of the crust beneath this region is available. For this reason, we have adopted the genetic algorithm to seismic waveform data recorded by Kottamiya broadband station. The crustal thickness varies slightly from 32 to 34 km with an average of 32.25 km, which is consistent with previous studies in the region. The crustal thickness shows a tendency of decrease toward the east and northeast being consistent with the general tectonic setting of the region including the opening of the Red Sea in the Tertiary times. Nonetheless, more teleseismic receiver functions from earthquakes recorded at denser seismic stations in northern Egypt and the southeastern Mediterranean combined with surface wave dispersion data as well as other geophysical investigations are necessary for more detailed imaging of the crustal structure which will deepen our understanding of the current tectonic and seismic activities of the region. |
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