Estimation of errors in determination of main parameters of earthquake hypocenter, recorded by the national seismic network of VietnamThe results of error estimation of epicenter coordinates and focal depth, recorded by the national network of 30 seismic stations of Vietnam allow drawing the following conclusions: The existing national seismic station network of Vietnam allows determining epicenter coordinates and focus depth in most of Vietnam territory with the errors Δh ≤...
16 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 706 | Lượt tải: 0
Land cover mapping in Yok Don National Park, Central Highlands of Viet Nam using Landsat 8 OLI imagesFor developing a detailed forest cover map, where the region is the tropical monsoon, along of the rainy season and the dry season is distinctive, with evergreen and deciduous forests. The first: optical satellite data from the dry season to help us accurately distinguish of evergreen forests and deciduous forests. The results indicated that to...
14 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 736 | Lượt tải: 0
Assessment and Simulation of Impacts of Climate Change on Erosion and Water Flow by Using the Soil and Water Assessment Tool and GIS: Case Study in Upper Cau River basin in VietnamFrom the results, in Upper Cau River system, it includes that the total annual runoff tends to increase compared with the baseline under the climate-change scenario B2. The change's rate of the later periods is bigger than the previous ones, appropriate with the changing tendency of evaporation and rainfall, which are the most important factor...
17 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 763 | Lượt tải: 0
Application of directional derivative method to determine boundary of magnetic sources by total magnetic anomaliesBy studying and applying the directional gradient of magnetic anomaly field to determine the boundaries of magnetized objects based on numerical models as well as actual magnetic anomaly data in Tuan Giao area, it is possible to make the following remarks: In case the magnetic anomaly sources are narrow in width and their structure extends in...
16 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 668 | Lượt tải: 0
Mapping land cover using multi-Temporal sentinel-1A data: A case study in HanoiThe proposed method in this paper allows classifying land cover maps in delta area with complex land cover types. However, the limitations of SAR image, including terrain shadows, speckle noise, and similarity in the surface texture of land cover objects can cause confusions in classification result. By combining standard deviation, mean backsca...
15 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 673 | Lượt tải: 0
Preliminary study on phytogeography of Dipterocarpaceae Blume family in VietnamAnalyzing geographical distribution of the Dipterocarps family of Vietnam shows that family has concentrately distributed in Indochinese floristic region, concurring with originative centre in Burma (Myanmar). There are 5 endemic species for 4 floristic provinces, covering whole Vietnam territory, belonging to Indochinese floristic region, whil...
8 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 774 | Lượt tải: 0
Mineralogical characteristics of graphite ore from Bao Ha deposit, Lao Cai Province and proposing a wise useBao Ha graphite ore occurs in massive form. The graphite is characterized as disseminated flake graphite, which occurs as distorted clusters of flaky plates/flakes within 50÷500 m (Figures 2-5). Graphite flakes associated intimately with the impurities even at very small scale (~10 m) (Figures 9-11). Based on XRD measurement combining with B...
13 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 634 | Lượt tải: 0
U-Pb detrital zircon geochronology of sedimentary rocks in NE Vietnam: Implication for Early and Middle Devonian PalaeogeographyDetrital zircons from two Devonian siliciclastic rocks, the Van Canh and the Van Huong Formations from the Do Son Peninsular (NE Vietnam) were analyzed for U, Th, and Pb isotopes by LA-SF ICP-MS techniques. The youngest zircon of each formation exhibits maximum ages of sedimentation at 407.1±9.5 Ma (Van Canh Formation) and 406.3±4.0 Ma (Van H...
21 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 665 | Lượt tải: 0
Identification of geothermal reservoir from exploration data in the Bang hot spring area, Central VietnamAmong more than 280 exposed hot water sources discovered in Vietnam, the geothermal sources with the indication of magmatic origin reflecting from their geochemical characteristics, geologicaltectonic conditions, and geothermal regime are concentrated in the Central Region. Since the geothermal sources of this type were recognized as aspirin...
14 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 682 | Lượt tải: 0
Geochemistry of late Miocene-Pleistocene basalts in the Phu Quy island area (East Vietnam Sea): Implication for mantle source feature and melt generationThis paper was conducted under a project within the framework of prioritized scientific and technological research projects of the Vietnam Academy of Science and Technology ‘Study of geochemistry and petrology of basalts in the coastal and offshore areas in south- Central Vietnam with implications to mantle and lithospheric dynamics’ coded ...
19 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 659 | Lượt tải: 0
