SUMMARY

A seismic regime of the Đà River hydroelectric ladder region

Lê Văn Dũng, Cao Đình Triều, Cao Đình Trọng, Nguyễn Đắc Cường

In this paper, the authors present some primary results of learning about the seismic regime of the Đà River ladder of hydroelectric plants. The following results have shown that natural earthquakes occurred in the Đà River ladder of hydroelectric plants are strongest in the Việt Nam territory. The largest earthquakes with the magnitude of 6.7 have been observed in Tuần Giáo and Lai Châu areas. The b coefficient of the Gutenberg - Richter function has the value of -0.935; The earthquake with the maximum magnitude in the range of 6.0-6.9 can be observed in 13 seismic sources: Muờng Tè, Nậm Nhé, Mường Nhé, Lai Châu - Điện Biên, Sơn La, Tuân Giáo, Phong Thổ, Mường La - Bắc Yên, Sông Đà, Nậm Tống, Mù Căng Chải, Lào Cai - Ninh Bình (Phan Sipan) and Mai Châu. In these sources, the danger of earthquake with the magnitude of 6.9 can be occurred on the areas of Mường Tè, Lai Châu, Tuân Giáo, Yên Châu and Mai Châu.

Người biên tập: TS. Lê Tử Sơn