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Research of the Seismogenic Mechanical Mechanism of Wenchuan Earthquake

Author: ZhaoLiang
Tutor: CaoJunXing
School: Chengdu University of Technology
Course: Solid Geophysics
Keywords: Wenchuan earthquake Earthquake fault Coseismic displacement Seismic dynamic action Strong earthquake recurrence cycle
CLC: P315
Type: Master's thesis
Year: 2011
Downloads: 25
Quote: 0
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Abstract


2008 Wenchuan earthquake occurred in the the Longmenshan in the northern section of the China 's most devastating since the Tangshan earthquake , a major earthquake , more than 87,000 compatriots Kidnapped earthquake . According to the survey after the earthquake , Wenchuan earthquake , a thrust and dextral strike-slip tectonic fault earthquake , widely considered a Songpan - Ganzi block east , migration stable on the Yangtze block, block after the release of accumulated stress . GPS observations but according to the announcement , the Sichuan Basin also occurred west of coseismic displacement . This table Ming Wenchuan earthquake the seismogenic mechanism may be far more complexity manifested . The Wenchuan earthquake seismogenic mechanism ascertain the basis for evaluation Longmenshan earthquake risk in the future . The coseismic displacement into both sides of the seismogenic fault plots , to start analyzing the Wenchuan earthquake seismogenic mechanism . Full chapters: The first chapter introduces domestic Wenchuan earthquake seismogenic mechanism Research ; The second chapter describes the distribution and characteristics of the Longmen Shan fault ; third chapter describes the Wenchuan earthquake coseismic rupture into seismogenic fault footwall seismogenic mechanism coseismic displacement and based on this analysis ; fourth chapter describes the prediction based on the coseismic strain analysis strong earthquake recurrence cycle . The analysis showed that the Wenchuan earthquake seismogenic mechanism Songpan - Ganzi block and the Sichuan block opposite compressive stress along the the Longmenshan central fault zone of dextral strike-slip shear stress composite role . Analysis and measurement results show that the footwall of Sichuan Basin, near the maximum horizontal displacement of the earthquake area west vertical Longmen Shan fault zone approximately 1.9m ; maximum horizontal displacement of nearly the earthquake area eastwards vertical Longmen Shan fault zone hanging wall Songpan - Ganzi block about 0.7m; hanging wall near earthquake area north east to the maximum horizontal displacement of approximately 1m; near earthquake zone of the footwall to the southwest to the maximum horizontal displacement of about 1.4m . Concluded that the Wenchuan earthquake Songpan - Ganzi block and the Sichuan block opposite compressive stress along the the Longmenshan central fault zone of dextral strike-slip shear stress composite role . The coseismic strain derived the Longmenshan 8 earthquake recurrence cycle for the 2858-5716 year .

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CLC: > Astronomy,Earth Sciences > Geophysics > Earth ( rock circles ) physics ( geophysics ) > Seismology
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