TAILIEUCHUNG - Báo cáo "Spatial variation of the active stress field in the North West of Vietnam: implication for related geohazard mitigation "

The NW of Vietnam is currently affected by a stress field characterizing by approximatc1y 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. . | VNU Journal of Science Earth Sciences 25 2009 56-63 Spatial variation of the active stress field in the North West of Vietnam implication for related geohazard mitigation Nguyen Van Vuong1 Vu Van Tích1 Ta Trong Thang1 Bui Van Duan2 1 College of Science VNU 2Institute of Geophysics Vietnam Academy of Science and Technology Received 4 January 2009 received in revised form 21 January 2009 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 respectively. 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 strongly 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 simplify from the subsurface downward to 40km depth. At this level depth the stress concentrates along the Dion Bien-Lai Chau fault while other faults release stress. Horizontally die liigh tectonic stress accumulates in some area such as western side of the Dien Bien-Lai Chau fault tire area from Dien Bien Dong to Lai Chau along the Son La Song Ma faults and in some segments of Song Ca fault. These stress anomalies link closely to historic earthquakes. Keywords Stress field Geohazard Active tectonics Geodymanics Earthquake. 1. Introduction The NW of Vietnam is limited to the north east and to the east by the Red River fault system to the south by the Song Ca fault to the west by the Dien Bien-Lai Chau fault. The whole region is sliced by NW-SE trending faults net that inherited from the Indosinian shear zones 4 . Most of them are active as sinistral strike slip faults dining Late Oligocene to Middle Miocene and subsequent dextral strike slip in Late Pliocene up to presence. Corresponding .

• Báo cáo khoa học
• Stress field
• earth sciences
• Research
• scientific research
• scientific reports
• Drought stress
• Split plot design
• Water stress tolerance in field conditions
• Field conditions
• Inbred lines of maize
• Recent approach
• Heat stress
• Agricultural production
• Response mechanism
• Field crops
• Transpiration suppressant agents
• Water stress
• Stress in field crops
• Effective approach to mitigate
• Antitranspirants in soybean
• Field veterinarians
• Job performance
• Coping mechanism
• Ground level analysis
• Field veterinary personnel on job stress
• Kruskal wallis
• Work stress
• Animal husbandry
• While delivering livestock services
• Modified MTS criterion
• Elastic stress field
• Bi material notch tip
• First nonsingular stress
• Modified maximum tangential stress
• Carrera unified formulation
• Three dimensional stress field
• Second Piola–Kirchhoff stress
• Refined 2D shell theory
• Geometrical nonlinearity
• Moisture stress
• Field capacity
• Stress tolerance
• Various morpho physiological traits
• Maximum relative water content
• Journal of Earth Sciences
• Stress inversion
• Stress regime
• Focal mechanism solution
• Active tectonic
• NW Iran SE Turkey
• Cohesive zone model
• Stress gradient
• Crack evolution
• Two dimensional elastic structures
• Non uniform stress
• Magnetic field stimulation
• Mitotic activity
• Antioxidant enzyme
• Ameliorate soil water stress
• Lupin Lupinus angustifolius L
• Cyclic Nucleotides
• Nucleotide
• Stress Responses
• Stress Induced
• Phytaspase Connection
• Membrane H+ ATPase
• Genes and Genomes
• Genomics Era
• Germin Gene Products
• Under Salt Stress
• Adaptation and Tolerance
• Chlorophyll content
• Magnetic field
• Yield of chickpea plants alleviated
• Salt stress by magnetopriming
• Chickpea plants alleviated
• Magnetic field apparatus
• Stress concentration zone
• Integrity assessment
• Defect detection
• Self magnetic flux leakage
• Butt joint
• Finite element
• MIG welding
• Residual stress
• Stainless steel
• BMC Plant Biology
• Low phytate seed
• Field emergence
• Glycine max
• Plant hormones
• Anti stress
• báo cáo của tạp chí Vietnam Journal of Mathematics
• tài liệu báo cáo nghiên cứu khoa học
• cách trình bày báo cáo
• kiến thức toán học
• báo cáo toán học
• Abiotic Stress
• SRO Family
• Characterization
• Plant Antioxidative
• Heavy Metal Toxicity
• Genetic and Molecular
• Báo cáo lâm nghiệp hay
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp
• Tree induced changes
• Terra rossa soil
• Stress features
• Illite like minerals
• Red Mediterranean soil