Dynamic Variation of S-Wave Q Value Beneath <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:City w:st="on">Sichuan-Yunnan</st1:City>, <st1:country-region w:st="on">China</st1:country-region></st1:place>

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PAN class=jzhaiyaobiaotistyle5>yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt" lang=EN-US>Dynamic Variation of S-Wave yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt" lang=EN-US>Qhaiyaobiaotistyle5>yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt" lang=EN-US> Value Beneath hemas-microsoft-com:office:smarttags" />y w:st="on">Sichuan-Yunnany>, y-region w:st="on">Chinay-region>

详细信息

责任者：Pei Shunping (Key Laboratory of Continental Collision and Plateau Uplift ; Institute of Tibetan Plateau Research ; Chinese Academy of Sciences ; Beijing 100085 ; China) ; Liu Jie
刊名：Chinese Journal of Geophysics
出版年：2010
卷期：53(7)
关键词：Q值 ; Q value ; 孕震构造 ; seismogenic tectonics ; 四川 ; Sichuan Province ; 云南 ; Yunnan Province
页码：p.1639-1652
图表：7 illus., 2 tables, 26 refs.
分类号：0500
issnNo：ISSN0001-5733
isbnNo：CN11-2074/P

摘要

yle="MARGIN: 0cm 0cm 0pt" class=MsoNormal>PAN class=jwenzhang>yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ’Times New Roman’; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US>In this study, the amplitude data from the Annual Bulletin of Chinese Earthquake and the provincial earthquake bulletins of hemas-microsoft-com:office:smarttags" />Sichuan and Yunnan were tentatively divided into 6 time segments. Tomographic yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US>Mhang>_{yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ’Times New Roman’; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US>L}yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ’Times New Roman’; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US> amplitude method has been applied for each time segment to obtain temporal yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US>Qhang>yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ’Times New Roman’; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US> value variations. Firstly, a representative time segment with more than 14 000 ray paths was selected to estimate the resolution and error of tomographic attenuation structure by adding random noise to original data and bootstrap method. Then, the same tomographic method with the same parameters was applied for all time segments. The result shows that: 1) the imaging error is small from the observation error of original data and ignoring radiation pattern of earthquake source. The error is less than 6% if 40% random noise is added to the original data; 2) the bootstrap method shows that the maximal error is less than 8% of average yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US>Qhang>yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ’Times New Roman’; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US> value, that means the tomographic results are stable and reliable because of huge data set in Sichuan and Yunnan region; 3) in checkerboard test, the resolution can reach 20’ for the region with more than 50 ray paths in each cell; and 4) the yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US>Qhang>yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ’Times New Roman’; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US> value variations were obtained after imaging for each time segment. A clear positive relation was found between the average yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US>Qhang>yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ’Times New Roman’; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US> value for each time segment and the number of middle and large earthquakes, in other words, the more earthquakes, the larger average yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US>Qhang>yle="FONT-FAMILY: Verdana; FONT-SIZE: 10pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: ’Times New Roman’; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体" lang=EN-US>, that may be resulted from the changes of regional stress.

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