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Coupling characteristics of stress and strain at different layers of different sub-regions in Yunnan and its adjacent areas

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Acta Seismologica Sinica

Abstract

In this paper, we collect 6 361 waveform data to calculate the shear wave splitting parameters from a regional seismic network of 22 digital stations in Yunnan and its adjacent area from July 1999 to June 2005. By using the cross-correlation method, 64 splitting events of 16 stations are processed. We also collect the splitting results of eight earthquake sequences to present the characteristics of shear wave splitting in Yunnan and its adjacent areas. The orientations of maximum principal compressive stress of three sub-regions in this area are derived from the CMT focal mechanism solutions of 43 moderate-strong earthquakes provided by Harvard University by the P axis azimuth-averaging method. The principal strain rate at each observatory is deduced from the observations of Crustal Movement Observation Network of China during the period from 1999 to 2004. In addition, the data of Pn aniso-tropy and SKS splitting of Yunnan and its adjacent areas are also collected. We have discovered from this study that the continental lithosphere, as a main seismogenic environment for strong earthquake, can be divided into blocks laterally; the mechanical behavior of lithosphere varies with depth and can be divided into different layers in the vertical orientation; the information of crustal deformation obtained from GPS might be affected by the type of blocks, since there are different types of active blocks in Yunnan and its adjacent areas; the shear wave splitting in this region might be affected mainly by the upper crust or even the surface tectonics.

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Authors and Affiliations

  1. Institute of Earthquake Science, China Earthquake Administration, Beijing, 100036, China

    Ma Hong-sheng  (马宏生), Zhang Guo-min  (张国民), Jiang Zai-sen  (江在森), Wang Hui  (王辉) & Wang Xin-ling  (王新岭)

  2. Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China

    Ma Hong-sheng  (马宏生) & Hua Wei  (华卫)

  3. China Earthquake Networks Center, China Earthquake Administration, Beijing, 100036, China

    Liu Jie  (刘杰)

  4. Earthquake Administration of Guangdong Province, Guangzhou, 510070, China

    Hua Wei  (华卫)

Authors
  1. Ma Hong-sheng  (马宏生)
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  2. Zhang Guo-min  (张国民)
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  3. Liu Jie  (刘杰)
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  4. Jiang Zai-sen  (江在森)
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  5. Hua Wei  (华卫)
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  6. Wang Hui  (王辉)
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  7. Wang Xin-ling  (王新岭)
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Corresponding author

Correspondence to Ma Hong-sheng  (马宏生).

Additional information

Foundation item: National Program on Key Basic Projects (2004CB418406), Social Commonweal Research Project of the Ministry of Science and Technology (2004DIA3J010), Joint Seismological Science Foundation of China (106016).

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Ma, Hs., Zhang, Gm., Liu, J. et al. Coupling characteristics of stress and strain at different layers of different sub-regions in Yunnan and its adjacent areas. Acta Seimol. Sin. 20, 133–146 (2007). https://doi.org/10.1007/s11589-007-0133-9

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  • DOI: https://doi.org/10.1007/s11589-007-0133-9

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