1National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Egypt
In September 03, 2015, an earthquake with magnitude MB = 4.5 occurred in a seismically quiet area located at 40 km south of El Alamein city, north western desert, where there are some 20 million pieces of unexploded ordnance. This study aims to review the widespread seismicity over interval periods of seismic monitoring of Egypt and argue El Alamein event as a new active source. The seismic catalog of Egypt was updating to January 2017, including the historical and instrumental earthquakes since -2200 BC. The seismicity of Egypt was compared over four periods based on significant evolution in the seismic monitoring system. Seismic source zones were delineated for each period based on the earthquake catalog, geologic structure trends and focal mechanisms. The new local seismic area was argued from entire historical, instrumental and modern observations and interpreted in view of the local and regional tectonic movements.