[1]QIN Jia-zheng,QIAN Xiao-dong,ZHAO Xiao-yan,et al.Stress Images of Yunnan-Burma Arc and Andaman Seismic Zone[J].Journal of Seismological Research,2008,31(04):340-346.
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Stress Images of Yunnan-Burma Arc and Andaman Seismic Zone
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
31
Number of periods:
2008 04
Page number:
340-346
Column:
Public date:
2008-04-23
- Title:
- Stress Images of Yunnan-Burma Arc and Andaman Seismic Zone
- CLC:
- P315.72+7
- DOI:
- -
- Abstract:
- In order to provide scientific basis for the seismicity tendency analysis of the Yunnan region,we build the relation to estimate shear stress value τ0 with seismic moment M0 and body wave magnitude mb based on the Haskell two-dimensional seismic dislocations model.We use the relation to estimate the τ0 value in the Yunnan-Burma arc and Andaman seismic zone according to the 1977-2005 data from USGS in the area,and analyze the image of stress and the characteristics of intraplate dynamic mechanism in the area.The analytical results indicate that the earthquakes in Burma arc and Andaman seismic zone mainly characterize interplate seismicity,and the average τ0 value is 8.8 Mpa; the earthquakes in the other areas mainly characterize intraplate seismicity,and the average τ0 value is 13.5 Mpa,about 1.5 times as much as that of interplate earthquakes.In the Himalaya mountains arc area,the compressive stress is in NE direction,while in the Yunnan region southeast of Qinghai-Tibet Plateau,the compressive stress shows a remarkable rotation toward SE direction,which may be caused by the joint effect of the continental collision and extrusion between the India and Eurasia plates and the back-arc extension in the Burma arc region.
- References:
- -
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Last Update:
2008-04-23