DYNAMIC SOURCE PARAMETERS OF THE 12TH OCTOBER 1992 EARTHQUAKE, CAIRO,EGYPT

On 12th October 1992 Egypt was hit by one of the largest earthquakes i n its recent history with magnitude of m(B) = 5.8. This event shook Ca iro and the northern part of the Nile valley and was felt in much of E gypt from Alexandria to Aswan causing widespread damage. The intensity in the epicentral area was of VIII degree on the Modified Mercalli in tensity scale. The focal mechanism solution indicates a normal faultin g with a strike-slip component. Dynamic source parameters derived from P-wave spectrum shows stress drop of about Delta sigma = 11 bar, seis mic moment of M(0) = 0.0410(25) dyn*cm, fault length of L = 6.01 km a nd relative displacement of 16.5 cm.