Characteristics of triggered earthquake
activity
in the Đà River hydroelectric ladder region
Cao Đình Trọng, Nguyễn
Anh Dương, Thải Anh Tuấn, Cao Đình Triều
The characteristics of the triggered earthquake
activity of the Đà River ladder of hydropower plants have been carrying out in this study.
The results have shown that: The reservoir triggered earthquakes occurrence in
the places of strong metamorphosed rocks (gneiss, marble...), granitites and
thick limestone that have been strongly broken and with the value of the Vp/Vs ratio equal to 1.63-1.67. In the case of Đà
River ladder of hydropower plants, the
reservoir triggered earthquakes occurrence needs the additional condition that
the height of the reservoir water level is more than 100 m; The danger of the
triggered earthquake occurrence must be occurring in the following places: The
segment of the Mường La - Bắc Yên seismic source connected with the Sơn
I La reservoir, from lowland of the Huội
Quảng dam to the lowland of Son La dam. The
maximum of the triggered earthquake magnitude, Mmax.kt
= 5.0-5.1; The segment I from The Pa Uon bridge to
the Son La dam of the Đà River seismic source has the I dangerous of triggered earthquake with
the maximum of the magnitude, Mmax.kt = 5.4- I 5.7;
Almost the whole of Mường Tè seismic source and a segment of the Mường
Nhé I source that connected with the Lai Châu reservoir have the dangerof triggered
earthquake with the maximum magnitude, Mmax.kt =
4.8-5.1.
Người biên tập: PGS. TS Nguyễn
Hồng Phương.