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Official thesis title: Study of geo-dynamics condition for Tuan Giao and adjacent area, establish the scientific criteria for earthquakes prediction.
1. Full name: Nguyen Huu Tuyen
2. Sex: Male
3. Date of birth: 25/11/1975
4. Place of birth: Ha Noi
5. Admission decision number: No 2259/SĐH December 07, 2006 by President of Vietnam National University, Hanoi.
6. Changes in academic process: An approval for extension study for 12 months from Rector of Natural Science University by the Decision No. 3345/QĐ-CTSV on December 17, 2009.
7. Official thesis title: Study of geo-dynamics condition for Tuan Giao and adjacent area, establish the scientific criteria for earthquakes prediction.
8. Major: Geotectonic
9. Code: 62 44 55 05.
10. Supervisors: Assoc.Prof.Dr. Chu Van Ngoi; Assoc.Prof.Dr. Cao Dinh Trieu
11. Summary of the new findings of the thesis
Specific results of the study have divided in 06 of the 2nd Geo-dynamic blocks: Hoang Lien Son, Song Da, Son La, Song Ma, Sop Cop and Dien Bien by the faults of the same rank. These 2nd Geo-dynamic blocks are continuosly divided into the higher blocks system by integrated analysis of quantitative results of data set; topography, geomorphology, geophysics and the vertical movement, horizontal movement along these boundaries.
The significant vertical movement on the 2nd Geo-dynamic block are rather high by geomorphology indicator Vf such as; Tu Le Vf = 0.185, Phan Si Pan Vf = 0.199, Song Ma Vf = 0.248, Son La Vf = 0.282, Dien Bien Vf = 0.283, Sop Cop Vf = 0.365; and the remaining of 2nd Geo-dynamic blocks are relatively low (relative subsidence) of Song Da Vf = 0.484, Red River Vf = 0.938.
There is strong differentiation of an average vertical velocity for the Pliocene - Quaternary period (about 5 million years ago) between these 2nd Geo-dynamic blocks such as: The 2nd Geo-dynamic Hoang Lien Son is 0.5 - 0.9 mm/year (the highest speed of Phan Si Pan block > 0.7 mm/year, Tu Le block of 0.5-0.6 mm/year and Hung Khanh block of <0.5 mm/year); these 2nd Geo-dynamic of Son La, Song Ma, Sop Cop and Dien Bien are in range of evarage velocity at 0.3 - 0.5 mm/year; And these 2nd Geo-dynamic Song Da and Song Hong are rather low velocity with an average of 0.1 to 0.3 mm/year and <0.1 mm/year in respectively.
There are strong horizontal deformation along the 2nd Geo-dynamic block boundaries by calculated the geomorphology index of sinuosity (Smf) such as: Son La fault Smf = 1.5 to 2.1; Dong Tuan Giao fault Smf = 1, 3 to 2.0; Pu Ma faulti Smf = 1.6 to 1.9; Muong Than - Khanh Yen fault Smf = 1.5 to 1.6. There are moderate of horizontal deformation along the 2nd Geo-dynamic block boundaries by geomorphology index of sinuosity (Smf) such as; Song Ma fault Smf = 2.1 to 2.3; Muong La - Bac Yen fault Smf = 2.1 to 2.5; Phong Tho fault Smf = 1, 7 to 2.3; Lai Chau - Dien Bien fault Smf = 1.6 to 2.7; Song Da fault Smf = 1.5 to 2.3. These other one are rather low of horizontal deformation along the 2nd Geo-dynamic block boundaries including Red River fault Smf = 2.3 to 2.7; Phan Sipan Smf = 2.2 to 2.7; West Tuan Giao Smf = 2.1 - 3, 0; Song Chay Smf = 3.2 to 3.5.
Research result of paleo-earhquake investigation has shown the possibility of maximum ancient earthquakes with magnitude greater than 7.5 (in Richter scale) had appeared in the study area. In the study area are able to predict the risk of nodes with threshold magnitude earthquake ³ 4.0 and Mo Mo> 5.0 by CORA application: The possibility of nodes with Mo> 4.0 including V9, V16, V25, v31, V38, V41, V42 , V44, V48, V49, V57, V60, V61, V64, V66, V69; The possibility of nodes with Mo ³ 5.0 Mo including V1, V2, V6, V8, V9, V10, V11, V12, V13, V15, v23, V58 , V61, V69, V70. The areas with the risk of strong earthquakes with magnitude 6.7 ¸ 6.8 (the largest observed earthquake) distributed mainly along the 2nd Geo-dynamic boundary such as; Son La, Song Ma, Tuan Giao, Lai Chau - Dien Bien, Fumatun, Phong Tho - Mu Cang Chai, Than Uyen and Lao Cai-Sapa.
The thesis has selected an appropriate analytical methods and criteria of geology, geophysics, geomorphology, seismic for classification of geo-dynamics block, earthquake hazard and earthquake prediction of Tuan Giao and adjacent area. In addition, these results will provide the new research results and contribute additional research methodology for Geodynamics study, earthquakes prediction and geodynamic mapping.
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