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SOME PRELIMINARY RESULTS FROM STUDY OF CRUSTAL DEFORMATION IN VIETNAM
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作者 Cao Dinh Trieu Le Van Dung +1 位作者 nguyen huu tuyen Pham Nam Hung 《大地测量与地球动力学》 CSCD 2003年第B12期114-118,共5页
In this work, the authors present some results of strain monitoring within the territory of Vietnam from 1984 to 2001. Data analysis shows that (1) the Phu Lien area is tectonically stable with low strain rate, 1×... In this work, the authors present some results of strain monitoring within the territory of Vietnam from 1984 to 2001. Data analysis shows that (1) the Phu Lien area is tectonically stable with low strain rate, 1×10\+\{-6\} /a; (2) the Hoa Binh area has indication of tectonic instability with relatively high strain rate of the earth crust: absolute value of the strain reaching 100×10\+\{-6\}, usual average strain amplitude of 60×10\+\{-6\}, whereas the monthly average strain intensity varies in a range from 30×10\+\{-6\} to 50×10\+\{-6\}; (3) there are clear indications of the strain state of the earth crust before occurrence of earthquakes of medium or higher magnitude. This is a very important indication in the research and short term prediction of earthquakes, especially for the areas with low seismic stability like the NW of Vietnam. 展开更多
关键词 越南 表层变形 应变测量系统 操作原则 应变数据 因变与地震 相对关系 地震活动特性
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Recognition of earthquake-prone nodes,a case study for North Vietnam (M≥5.0)
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作者 nguyen huu tuyen Ngo Thi Lu 《Geodesy and Geodynamics》 2012年第2期14-26,共13页
Morphostructural nodes in North Vietnam are delineated with the morphostructural zoning (MZ) method, and classified into seismogenic and non-seismogenic nodes. The compiled morphostructural map ( scale 1 : 1000000... Morphostructural nodes in North Vietnam are delineated with the morphostructural zoning (MZ) method, and classified into seismogenic and non-seismogenic nodes. The compiled morphostructural map ( scale 1 : 1000000) shows a three-level hierarchical structure of blocks, boundary zones, and nodes. The identified nodes are classified with the pattern-recognition algorithm CORA-3 into those that are prone to generate M≥5.0 earthquakes and those that are not. Some of the earthquake-prone nodes coincide with epicenters of M ≥ 5.0 earthquakes that have occurred ; others may coincide with such events in the future. 展开更多
关键词 North Vietnam morphostructural zoning pattern recognition seismogenic nodes
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