Earthquake Hazard Assessment With The Help Of Remote Sensing And Gis Techniques

The earthquake hazard in an area depends mainly on three factors: - 1) The Regionalrnearthquake sources and seismic wave propagation characteristics, 2) The local geology’srnresponse to, and modification of, Earth- quake ground shaking and 3) Type and use ofrnbuildings and life lines constructed in the area, which includes the:- the number of peoplernliving under the roof, the time the earthquake happened ,night, rush hour, day time etc. Inrnthis study the study area is assessed in terms of these controlling factors, it is found to bernthe most earthquake hazard prone area in terms of earthquake frequency, in terms ofrnpopulation density, though it is not densely populated now(around 7000), the populationrnin Semera town is expected to grow to around 18,000 by the year 2025, and the type ofrnbuildings in the area are from single to two storey concrete type of buildings, anrnearthquake intensity level of VIII and IX are expected in the area, these earthquakernintensities have a power that can damage these buildings, the Ethiopian building codernstandard uses the same building regulations for all towns in the rift(Arbaminch, Ziway,rnNazret, Semera, Dessie, michew, Mekelle, Adigrat, etc),hence the building code needsrnupdating, because the intensity levels expected in semera area is higher than the otherrnareas in the rift.

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