SUMMARY

Analysis of contemporaneous geodynamic features of the East Việt Nam sea region

Ngô Thị Lư, Rogozhin E.A.

On the basis of applying methods of the complex analysis of the geologo-geophysical, geomorphological, seismological and GPS data, is examined the geodynamic regime of the different sea troughs: Black Sea, Adriatic, Caspian, Ligurian, Tirrenian and East Việt Nam Sea. There were distinctly and uniquely revealed spatial relations and transition between all stages of the manifestation of depressive regime (taphrogenesis), as well as between depressive (taphrogenic) and platform regime. On this basis is shown the relationship between contemporaneous and ancient geodynamic processes and features of underwater seismicity for the East Việt Nam Sea. The got results show that in the studied area exist all stages of manifestation of the depressive regime. However, only one of them is dominant, occupying about 50% of the total area. This is the stage T3, in whose sphere of manifestation the bevelled thickness of the Earth crust reaches from 10 to 15 km. This stage is the most widespread in such troughs, as Black Sea, Tirrenian and East Việt Nam Sea. The manifestation of other stages differs one from another for different troughs. Particularly, the contemporaneous stages T5 and T6 represent only for East Việt Nam Sea troughs.

Ngày nhận bài: 28/12/2006.

Người biên tập: Trần Văn Trị