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研究生:阮國強
研究生(外文):Quoc-Cuong Nguyen
論文名稱:SIMULTANEOUSDETERMINATIONTHICKNESSANDVELOCITYSTRUCTUREOFLAYEREDVELOCITYMODELOFREDRIVERUSINGGENETICALGORITHMMETHOD
論文名稱(外文):SIMULTANEOUS DETERMINATION THICKNESS AND VELOCITY STRUCTURE OF LAYERED VELOCITY MODEL OF RED RIVER USING GENETIC ALGORITHM METHOD
指導教授:吳逸民吳逸民引用關係
指導教授(外文):Yih-Min Wu
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:地質科學研究所
學門:自然科學學門
學類:地球科學學類
論文種類:學術論文
畢業學年度:97
語文別:英文
論文頁數:50
中文關鍵詞:Red River Fault ZoneVelocity structureGenetic algorithm
外文關鍵詞:Red River Fault ZoneVelocity structureGenetic algorithm
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ABSTRACT
Layered velocity model is important information for seismological study. Actually is being used the three layers model in Vietnam region but it is too simple because of owing to the lack of condition of data in the earthquake catalogues. Thus, it is necessary to build up a good-layered model for earthquake monitoring in Vietnam.
Simultaneous determination of thicknesses and velocities of a layered model is a non-linear problem. Genetic algorithm is one of the methods to solve non-linear problem. In this study, we have tried to apply this method to determine a layered model for Red River.
My results were obtained by separating the new 1D model into 7-8 layers. The first one presents a velocity of 4.3 km/s, instead of 5.8 km/s in the fore studies. For a deeper layer from 0.6 km to 7.6 km P wave velocity becomes larger 5.4 km/s – 5.8 km/s. Thus, I suggest that above the base rocks, there is a layer of crack rocks situating at the depth from 0.6 to 7.6 km. This ideal from new model seems agreeable with territory and tectonic of Vietnam. According to Cao et al. (2000), Nguyen et al. (2004) Conrad layer when depth changes from 17 km to 23 km and P wave velocity changes from 6.1 to 6.7 km/s. Finally when the depth of Moho surface changes from 24 to 35 km the P wave velocity also changes from 7.6 -8.1 km/s.
CONTENT

ACKNOWLEDGMENTS......................................................................iii
Abstract....................................................................................................iv
List of Figures...........................................................................................v
List of Tables..........................................................................................viii

1. Introduction........................................................................1
2. Characteristic of Red River Fault Zone and seismological network.......................................................................................3

2.1 Characteristic of Red River Fault.........................................3
2.2 Seismological network of Vietnam.......................................9
2.3 Seismicity of Northern Vietnam.........................................14
2.4 Data.....................................................................................18

3. Methodology.........................................................................19

3.1 Principle of initial data preprocessing....................19
3.2 Theoretical basic of Genetic Algorithm....................21
3.2.1 Theoretical of Genetic Algorithm................................21
3.2.2 GA program and its parameters................................24
4. Results...................................................................................28
4.1 Results of average 1D Velocity model.................................28
4.2 Results of 1D velocity structure after relocate....................34

5. Discussions............................................................................41
5.1 Single station results and distribution of Stations..............41
5.2 Synthetic test in further study............................................44

6. Conclusion...........................................................................45


References...............................................................................48
REFERENCES

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Bui T T H, Yasuhiro Yamada and Toshifumi Matsuoka (2003). Deformation in Northern Vietnam under the influence of SE Asian Tectonics and its impact to Natural Resources Accommodation. The 8th International Symposium on Recent Advances in Exploration Geophysics in Kyoto, Japan.

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Cao D.T et al. (2000).The earth crust model of the Red River Fault Zone on the territory of Vietnam. Journal of Geosciences., 22/4, 347-354 (in Vietnamese with abstract English).

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Hiroaki Yamanaka and Hiroshi Ishida (1996). Application of genetic algorithms to an inversion of surface-wave dispersion data. Bulletin of the Seismological Society of America., 86, 436 - 444.

Hsin-Hung Wu (2002). A Study on Seismicity of Red-River Fault Zone in Vietnam and the Velocity Structure of Crust and Upper Mantle in Southeast Asia. Doctoral dissertation, NCU, Taiwan., 174. (In Chinese with English abstract)

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Le Tu Son (2005). The activity of the Red River Fault in the Cenozoic time and the Seismicity of the Red River Fault Zone on the territory of Vietnam. Post doc research in Kyoto University.

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Philippe Herve Leloup et al.(1995),The Ailao Shan - Red River shear zone (Yunnan, China), tertiary transform boundary of Indochina. Tectonophysics., 251, 3-84.
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Yih-Min Wu, Li Zhao, Chien-Hsin Chang, and Ya-Ju Hsu (2008), Focal-Mechanism Determination in Taiwan by Genetic Algorithm, Bulletin of the Seismological Society of America., 98, 651 - 661.
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