http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/63 2026-05-18T00:22:52Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/9003 Title: Spatial variation of the active stress field in the North West of Vietnam: implication for related geohazard mitigation Authors: Nguyen, Van Vuong; et al. Abstract: The NW of Vietnam is currently affected by a stress field characterizing by approximately NS and EW sub-horizontal maximum and minimum principal stress axis respective1y. The results obtained from field investigations and numeric modelisation reveal that the present stress field varies not only in relative magnitude but also in orientation of principal stress axes from point to point and in depth. The tectonic stress variation strong1y depends on the geometry and active kinematics of faults as well as on their earthquake history. The modeling shows that the tectonic stress field tends to simplity from the subsurface downward to 40km depth. At this level depth, the stress concentrates a1ong the Dien Bien-Lai Chau fault while other faults release stress. Horizontally, the high tectonic stress accumulates in some area such as western side of the Dien Bien-Lai Chau fault, the area from Dien Bien Dong to Lai Chau, a1ong the Son La, Song Ma faults and in some segments of Song Ca fault. These stress anomalies link close1y to historic earthquakes. 2009-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/9002 Title: Land resources usage and agricultural production organization for resettled people in Son La hydro-electric power station project ((Case study in Yen Chau District, Son La Province) Authors: Tran, Van Tuan Abstract: Recently, the resettlement activities of Son La hydroelectric power station (SHPS) have been carrying out within three provinces: Son La, Lai Chau, and Dien Bien. The main problem is that with limited land fund for resettlement (each household has about 1-2 ha of agricultural land in average [6]), the land use and argicultural production organization should be ensure favorable conditions for resettled people. Yen Chau District, Son La Province is one of the resettlement areas of SHPS project. Until 2008, 273 households have resettled in 8 areas belonging to 5 communes of the district. Based on the assessment of present conditions of land use, land use plarming, and argicultura1 production organization for resettled people, the arctic1e have proposed some measurements for sustainable land use and the models of ecological economic, household that have high economic, social, and environmental effectiveness. 2009-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/9001 Title: Changing of shoreline during the Late Quatemary in relationship with geodynamics and their affect to the coastal environment of the Red River Authors: Chu, Van Ngoi Abstract: In many years, changing of shoreline has caused a lot of difficulties for the sustainable development of socio-economics in the coastal zone of the Red River delta. Here, in after the Flandrian transgression, accretion process of expanding delta has continuously deve1oped. The eroded sections of shoreline appeared at the beginning of the Twentieth century (1905). The most intensive segment is in Hai Hau district. The Erosion re1ated mainly to the lack of sediment caused by exogenous and human activities. Affect of endogenous process to erosion is very weak. The Erosion in Hai Hau has continuously developed because sediment at the Red River mouth is mainly being transported to the SW to the depth of 5-25m, 62 percent of which is transported cross-shore. In order to use land effectively in the coastal zone, at intensive eroded shorelines geotechnical measures have to be applied such as strong sea dyke and groins. In case of areas typhoon landing at the spring tide, people in the vu 1crable areas at the coast have to move to safe areas. 2009-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/9000 Title: Sequence stratigraphy of Quatemary depositions on the land and at the continental shelf of Vietnam Authors: Tran, Nghi; et al. Abstract: The sequence stratigraphy units of the Quaternary sediments at the continental shelf of Vietnam have been compared with the lithofacies and depositional cycles in relation to sea level changes. During the regression phases corresponding to the lowstand systems tract has being formed the alluvial lithofacies, shelf deltaic complex and shelf edge fans complex. The maximum regression remarked by erosion boundaries has corresponded with the lowstand sea level characterized by the slope fan turbiditte complex. The transgression phase ilas lcaded to forru the ravinement surfaces and the transgressive systems tract deposits for the end of each sequence (depositional cycle). 2009-01-01T00:00:00Z