SUMMARY

Discovery of an active fault system
in the Đà River hydroelectric ladder region by using GIS technology

Phạm Thị Hiền, Đặng Thanh Hải, Phan Thanh Quang, Cao Chiến

The applications of GIS technology in studies of geological hazards are becoming popular. Relevant spatial data can be modeled as DEM, deep cleavage, cleavage level, lithological... used in determining active faults. The combination of these data was earned out on the basis of determining weights for each factor expression of active faulting by using hierarchical analysis model. Factors used as input data were constmcted by identification problem with the Sơn La standard fault (through Tuần Giáo town), where the Tuần Giáo earthquake was occurred in 1983. Using map components and ArcGIS software, through the process of superposition, the authors have established an active fault map at scale 1:200,000. An active fault zone in the Đà river hydroelectric ladder region was detected including: Lai Châu - Điện Biên, Phong Thổ - Than Uyên and Mường La - Bắc Yên, Sông Đà, Tuần Giáo, Mai Châu, Mù Cang Chải, Lào Cai - Ninh Bình, Mường Tè - Nậm Nhé, Nậm Tống and Mường Nhé.

Người biên tập: PGS. TS Nguyễn Ngọc Thạch