SUMMARY
Recent
geodynamic characteristics of Vietnamese coastal zones
Cao Đình
Triều, Lê Duy Bách, Ngô Gia Thắng, Bùi Anh Nam, Trần Nghi,
Chu Văn Ngợi, Nguyễn Văn Vượng, Phạm Huy
Long, Đỗ Văn Lĩnh, Nguyễn Tài Thinh
In this article, the authors attempt to present the principles of establishment of recent geodynamic map for Vietnamese coastal zones. The obtained results show that:
1/ The Earth’s crust in the Vietnamese coastal zones is in the equilibre and compressed state.
The compression has the N-NE (5-100) direction gradually changing
to longitudinal direction from Móng
Cái to Nghệ-Tĩnh areas; N-NW direction to sublatitudinal
direction from Quảng Bình to Đà Nẵng areas; sublatitudinal to latitudinal
from Quảng Ngãi to Phú Yên areas and; from N-NW (20-300) to S-SE in coastal zone of South Trung Bộ, Nam Bộ and Kiên Giang - Cà Mau areas.
2/ Strongest earthquake can occur in the Vietnamese coastal zone with maximal magnitude
of 6.5-7.5 Richter degree, and with Mmax = 7.0-7.5 in almost all
source areas of the studied region. In the Ba Tơ - Củng Sơn, Biên Hòa - Tuy Hòa, East Côn Sơn, Phú Quý - Cảnh
Dương, Hòn Chuối and Cà Mau source areas, earthquake
may occur with Mmax of about 6.5-7.0 Richter
degree. The Nha Trang source area has the earthquake
danger with Mmax not surpassing 6.5.
3/ In recent time, endogenous dynamic activities continue to occur
with various scales, such as manifestations
of heat flows, volcanic activities and tectonic
movements. They have the tendency of concentrating in basic
tectono-geodynamic boundaries of the region.
Người biên tập: TS.