Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1780702 | NRIAG Journal of Astronomy and Geophysics | 2013 | 9 Pages |
Abstract
We analyze the digital waveform data of about 1000 seismograms, recorded by portable network of 10 vertical component seismographs that are employed in a temporary survey experiment in the Abu Dabbab area in 2004, and the results indicate: firstly, there are similar waveform seismograms, which are classified into three groups. In each group a master event is identified. Then, the arrival time delays of the P and S phases (Îtp and Îts, respectively) are measured between the master event and its slave events. Îtp and Îts range between â0.01 and 0.02 s, respectively. These values are used to relocate the studied events. Secondly, the slowness vector (Îs) in 3-dimensional pattern, which is estimated using the genetic algorithms, is found Îsx = 0.0153, Îsy = 0.00093 and Îsz = 0.2086 s/km in the three spatial coordinates (X, Y and Z), respectively. These analyses demonstrate the inhomogeneities within the upper crust of the study area. Also, Îs shows little dependence of lateral distances and reasonably high slowness along the depth extent, which is consistent with the seismic velocity structure variations.
Keywords
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Physical Sciences and Engineering
Physics and Astronomy
Astronomy and Astrophysics
Authors
Mahmoud Sami, Awad Hassoup, Ahmed Hosny, Gadelkarem A. Mohamed,