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- W4247460981 abstract "The Thurber iterative simultaneous inversion program is used to determine the three-dimensional P-wave velocity structure in the Aswan seismic region of Egypt. The tomographic inversion presented in this study is based on 1131 P-phase observations at 13 stations from 89 local earthquakes, all of which occurred within the Kalabsha fault zone. The assumed initial velocity model is that deduced from local explosion experiments. The results indicate that the Aswan region is characterized by a heterogeneous crust, consisting of a shallow, low-velocity zone and a deeper high-velocity anomaly. Seismic velocity structure within the shallow part demonstrates that the inferred change in velocity exists primarily across the east-west trending Kalabsha fault scarp, whereas the high-velocity zone is located south of this fault. Two well-resolved, low-velocity zones appear within the upper 6 km of the crust. The first coincides with a graben structure located between the Kalabsha and Seiyal faults and the second exists between the N-S Kurkur fault and the main axis of Lake Aswan. Both low-velocity zones occupy an area of approximately 30 × 40 km, located along the western bank of the lake. The most significant result of this study is that the location of the deeper, high-velocity anomaly coincides with the concentration of seismic activity in the lower crustal layer." @default.
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- W4247460981 date "1995-01-01" @default.
- W4247460981 modified "2023-10-18" @default.
- W4247460981 title "Tomographic Inversion for the Three-dimensional Seismic Velocity Structure of the Aswan Region, Egypt" @default.
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- W4247460981 doi "https://doi.org/10.1007/978-3-0348-9238-4_16" @default.
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