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

On 12th October 1992 Egypt was hit by one of the largest earthquakes in its recent history with magnitude of m(B) = 5.8. This event shook Cairo and the northern part of the Nile valley and was felt in much of Egypt from Alexandria to Aswan causing widespread damage. The intensity in the epicentral area was of VIII degree on the Modified Mercalli intensity scale. The focal mechanism solution indicates a normal faulting with a strike-slip component. Dynamic source parameters derived from P-wave spectrum shows stress drop of about Delta sigma = 11 bar, seismic moment of M(0) = 0.04*10(25) dyn*cm, fault length of L = 6.01 km and relative displacement of 16.5 cm.