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The murdjadjo (Oran) geological structure which consists of an asymmetricfold has been studied. The anticline has a length of about 32 km and isN050 trending. Its relationship with the relatively high historical seismicityof the region is analysed. New critical investigations of contemporary documents enabled us to re-evaluate the December, 12, 1959(Ms = 4.7) and the May 12, 1889 (Ms = 4.6) earthquakes...
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