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- W3144525908 abstract "In this study we obtained the tomography results of Q Lg in Sichuan-Yunnan region,separately for each frequency,by using seismic wave data recorded by Yunnan and Sichuan seismic networks.The spatial resolution of our result is less than 100 km.Our results demonstrate that strong heterogeneity exists in the studied region,showing large difference between the highest and lowest Q value.The obvious high attenuation regions include the southeast edge of Sichuan-Yunnan rhombic block from Xianshuihe fault zone to Anninghe fault zone,the Simao-Lancang-Pu′e region,the Songpan-Maowen region to the west of Longmenshan fault zone,as well as the Batang and Litang strong earthquake region.According to our result,high attenuation of Lg waves corresponds to strong seismic active zones,ruptured area of large earthquakes,high terrestrial heat activity,and low velocity.It demonstrates that broken medium caused by strong tectonic activity or large earthquakes and heat flow upwelling along active faults may be the main reasons of low Q Lg in Sichuan-Yunnan region.The obvious low attenuation regions include the Sichuan basin,the eastern block of Yunnan region,and the middle part of Jinshajiang and Nujiang fault zones.The interior of Dianzhong block also shows lower attenuation than the nearby area.Low attenuation regions correspond to the stable tectonic block,weak tectonic activity and high velocity.It shows that low attenuation of Lg wave in Sichuan-Yunnan region is correlated with small crustal deformation,low seismic activity,weak hydrothermal activities and stable block." @default.
- W3144525908 created "2021-04-13" @default.
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- W3144525908 date "2008-01-01" @default.
- W3144525908 modified "2023-09-23" @default.
- W3144525908 title "Tomography of Q_(Lg) in Sichuan-Yunnan Zone" @default.
- W3144525908 hasPublicationYear "2008" @default.
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