الفهرس 
Seismicity of the Northern Part of EgyptOnly 14 pages are availabe for public view
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Abstract
Crustal deformation study is very important of geodynamical research for the properties of our planet in regional or global scale. The study of crustal movement means the determination of the magnitude; direction and rate of thesemovements. The world-wide tools for such a study are mainly the repeated geodetic terrestrial and space technique measurements. The successful progress of the global positioning system (GPS) has given a new momentum to study recent crustal movements and their relation to earthquakes occurrence. Recently, in Egypt, GPS has been applied around seismoactiveregions to monitor the recent crustal movements in those areas.
In the last few years, the Egyptian Government was planning many projects in the vital part of Egypt as Red Sea, Gulf of Suez, Sinai and coastal regions. One of these projects is to transform of these regions into an international attractive and economical regions. For this purpose the seismic hazards and risk assessment are needed to mitigate the hazards. A Geodetic network has been selected at Northern Egypt is consist of thirteen stations.
The geological and seismic studies are collected and studied carefully to know the main seismic active trend which passes through the area under study. The analysis of focal mechanism solution of the studied area showed that there is a normal faulting with strike slip component oriented in NE-SW & WNW-ESE. These studies have been taken into consideration during the reconnaissance procedure and the selection of network stationsand consequently network design. For monitoring horizontal movement at the northern Egypt, a geodetic network with special configuration has to be selected and periodical measurements have to be carried out using GPS technique.
The analysis of these measurements gathered with the frequency and intensity of seismic activity may have led to earthquake prediction and reduce earthquake risk within the area under investigation. Three campaigns were carried out with dual frequency Trimble 5700 and NETR5.The initial GPS measurements were performed in the first of, 2013to the end of, 2014. The observed session time span was 24 hourswith 30 seconds sampling rate and 15° mask angle.
Bernese software version 5.2 was used for processing GPS data. Other software for adjustment and deformation parameters calculation was used. International GPS service (IGS) stations were used in the processing of GPS data. The network is tied with IGS stations to compute the precise coordinate of all stations of the network with International Terrestrial Reference Frame (ITRF2008). The displacement vectors at each GPS stations were determined under the assumption that free network approach and all station in the network are minimized. The horizontal components of the velocity vectors used to estimate the strain parameters which include Dilatation and Maximum Shear strain.