A review of the Egyptian National Seismological Network after 20 years of operation

摘要

On 12 October 1992, a moderate earthquake with magnitude, Mw 5.8 was occurred in Cairo; the epicentre is located 25 km south west of Cairo, resulted in great damage in the surrounding area and extended 300 km away from the epicentre. Subsequently, the government established Egyptian National Seismological Network (ENSN) under the supervision of National Research Institute of Astronomy and Geophysics (NRIAG) with 66 stations of different recording bands (e.g. short period, broadband) for monitoring the seismic activity in and around Egypt. The network started operation since mid-1997 up till now, consider revising 20?years of operation, a lot of changes were done (sensors, digitisers, station locations and even stations name), there is still the absence of adequate documentation of the type of changes made. This article is the first attempt to study the recorded data to track all changes done in the network, as a first step towards a different studies regarding determination of the detection capabilities of ENSN’s stations and proposed an optimisation solutions for the current faced problems. A software code was designed under Matlab programme to read around 55,000 recorded events and track different changes that took place during the operational time. The output of this study will affect all related research work including magnitude determination and hazard analysis.