Abstract
The spectral analysis of fifty-five KEG VBB records from the October 12, 1992 Cairo earthquake source region was performed to obtain the seismic moment. We obtained this parameter in turn to develop empirical local magnitude (ML), seismic moment (Mo), coda duration (D) relations for that region. In this study the data consist of Lg-waves on the vertical component seismograms for the recorded earthquakes with ML ranging from 1.7 to 4.7. The derived empirical relation between the seismic moment (Mo) and magnitude ML for the aftershocks sequence with 1.7 = ML < 3.5 is Log (Mo) = (0.96 ± 0.05) ML + (17.88 ± 0.13). We found a correlation between the coda duration (D) and Log of the moment (Log (Mo)) as follows: Log (Mo) = (2.35 ± 0.27) Log (D) + (16.33 ± 0.48).
Highlights
On 12th of October 1992 a moderate size earthquake of Mw = 5.8 occurred at epicentral distance of about 25 km south west of Cairo city downtown in Dahshour region at a depth of 22 km
We found a correlation between the coda duration (D) and Log of the moment (Log (Mo)) as follows: Log (Mo) = (2.35 ± 0.27) Log (D) + (16.33 ± 0.48)
Seismic moment Mo, logarithm of the coda duration and the local magnitude empirical relations were derived for the aftershocks of 1992 Cairo earthquake source area, providing a simple and straightforward way to quantify the source strength Mo through such relationships, which is superior to any magnitude scale
Summary
On 12th of October 1992 a moderate size earthquake of Mw = 5.8 occurred at epicentral distance of about 25 km south west of Cairo city downtown in Dahshour region This earthquake was felt from Alexandria to Aswan. It registered a maximum observed intensity of 7 + in MSK intensity scale in Dahshour region (Maamoun et al, 1993). The only significant earthquake reported in this region during the historical period occurred in 1847. This mainshock was followed by an aftershock sequence. Within twenty two days after the occurrence of the Cairo earth-
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