All data recorded from January 2016 to August 2017 using the three permanently installedrnstations around the city namely AAE, FURI and ANKE together with the newly deployed (onrnDecember 2016) permanent seismic station WLRA (Wolmera) are used in this study. Duringrnthis period81 natural earthquakes and 123 quarry explosions were recorded around AddisrnAbaba. The local magnitude of natural earthquakes registered ranges from 1.3 to 5.1 ML andrnthe local magnitude from quarry explosions ranges from 1.2 to 3.0 ML.rnThe seismic events those from earthquakes clustered around the city of Addis Ababa. However,rnit is not in random fashion; most of the events from natural earthquakes around the city arernconcentrated following the trend of the MER which is NE -SW. Most of the epicentersrnconcentrate SW and NE of the city. Few earthquake events are located on north of the city andrnaround its eastern part. No events are located on the western part within the period of ourrnobservation.rnThe other seismic events registered are explosions from quarry sites in the neighborhood ofrnAddis Ababa within 10-30 Km radius from the city center with the exception to thernsouthwestern part. Epicenters from quarry explosion trend along the location of quarry sites.rnMost of the quarry events cluster east of the city since most of active quarry sites are locatedrnin that area; to be specific east of the Bole International Airport.rnOne of the discrimination methods of earthquakes from quarry blasts is by using origin time ofrnevents. Almost all quarry blasts are conducted in the daytime from 8:00AM to 5:00 PMrnwhereas the natural earthquakes can originate anytime of the day. Locations of event sites arernalso used as a discriminator. Quarry sites, are clustered in close proximity to the city whilernnatural earthquakes are not limited to specific sites and origin time unlike explosions.rnThe other method used for isolation of the two types of events is by comparing the spectra ofrnthe seismogram from natural earthquakes and from the quarry explosion. The spectrogram ofrnevents from natural earthquakes and quarry explosions is analyzed using the seismogramsrnfrom Z component AAE and FURI for this study. The result shows a difference in frequencyrnand energy radiation pattern for the two groups of events. The seismograms from quarryrnblasts have weaker body waves with high frequency content while earthquakes have strongerrnbody wave arrival with low frequency content relative to the explosion events.rnIn addition I tried to discrimination events from quarry blasts and earthquakes by using ratiornof amplitude of body waves to surfaces waves Ap/As. This method is not 100% efficient.rnHowever, I used it together with the above mentioned methods to discriminate quarry blastsrnfrom natural earthquakes.