caa a22 4500 463172175 CHVBK 20180406164816.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s10950-007-9051-5 doi (NATIONALLICENCE)springer-10.1007/s10950-007-9051-5 Source mechanism and source parameters of May 28, 1998 earthquake, Egypt [Elektronische Daten] [K. Abou Elenean, H. Hussein] On May 28, 1998, a moderate size earthquake of mb 5.5 occurred offshore the northwestern part of Egypt (latitude 31.45°N and longitude 27.64°E). It was widely felt in the northern part of Egypt. Being the largest well-recorded event in the area for which seismic data from the global digital network are available, it provides an excellent opportunity to study the tectonic process and present day stress field occurring along the offshore Egyptian coast. The source parameters of this event are determined using three different techniques: modeling of surface wave spectral amplitudes, regional waveform inversion, and teleseismic body waveform inversion. The results show a high-angle reverse fault mechanism generally trending NNW-SSE. The P-axis trends ENE-WSW consistently with the prevailed compression stress along the southeastern Hellenic arc and southwestern part of the Cyprean arc. This unexpected mechanism is most probably related to a positive inversion of the NW trending offshore normal faults and confirms an extension of the back thrusting effects towards the African margin. The estimated focal depth ranges from 22 to 25km, indicating a lower crustal origin earthquake owing to deep-seated tectonics. The source time function indicates a single source with rise time and total rupture duration of 2 and 5s, respectively. The seismic moment (M o) and the moment magnitude (M w) determined by the three techniques are 1.03 × 1017Nm, 5.28; 1.24 × 1017Nm, 5.33; and 1.68 × 1017Nm, 5.42; respectively. The calculated fault radius, stress drop, and the average dislocation assuming a circular fault model are 7.2km, 0.63Mpa, and 0.11m, respectively. Springer Science+Business Media, Inc., 2007 Source mechanism nationallicence Source parameter nationallicence Surface wave amplitude spectra nationallicence Waveform inversion nationallicence 28 May 1998 earthquake nationallicence Continental margin of Egypt nationallicence Abou Elenean K. Seismology Department, National Research Institute of Astronomy and Geophysics, 11421, Helwan, Egypt aut Hussein H. Seismology Department, National Research Institute of Astronomy and Geophysics, 11421, Helwan, Egypt aut Journal of Seismology Kluwer Academic Publishers 11/3(2007-07-01), 259-274 1383-4649 11:3<259 2007 11 10950 https://doi.org/10.1007/s10950-007-9051-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10950-007-9051-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Abou Elenean K. Seismology Department, National Research Institute of Astronomy and Geophysics, 11421, Helwan, Egypt aut NATIONALLICENCE 700 1- Hussein H. Seismology Department, National Research Institute of Astronomy and Geophysics, 11421, Helwan, Egypt aut NATIONALLICENCE 773 0- Journal of Seismology Kluwer Academic Publishers 11/3(2007-07-01), 259-274 1383-4649 11:3<259 2007 11 10950 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer