| 利用ML振幅研究地壳横波Q值I: 不同构造区的衰减特征 |
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| 引用本文： | 汪素云,裴顺平,许忠淮,张国民,俞言祥,潘华.利用ML振幅研究地壳横波Q值I: 不同构造区的衰减特征[J].地球物理学报,2007,50(6):1740-1747. |
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| 作者姓名： | 汪素云 裴顺平 许忠淮 张国民 俞言祥 潘华 |
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| 作者单位： | 1.中国地震局地球物理研究所，北京 100081;2.中国科学院青藏高原研究所，北京 100085;3.中国地震局地震预测研究所，北京;100036 |
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| 基金项目： | 国家自然科学基金(40674031,40374017)，国家科技支撑计划(2006BAC13B01)资助，中国地震局地球物理研究所论著号07AC1017 |
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| 摘 要： | 本文利用《中国地震年报》中测定震级ML时所用的区域地震图中水平向的最大振幅及周期资料，研究了地壳内横波的衰减及介质品质因子Q0特征. 结果表明，中国整个区域平均的Q0值为367，以华南地台最高，为460，塔里木盆地为442，鄂尔多斯高原为419，华北地区最低，为294，其次是川滇地区为295. 由这个结果可知，Q0与地质构造之间存在明显的相关特征，在构造上稳定的克拉通地台，如塔里木盆地、鄂尔多斯高原、华南地台等具有较高的Q0值；而构造上活动的强烈剪切变形带和新生代扩张盆地，如川滇地区和华北断陷盆地往往是Q0值低的地区，这和Pn速度分布特征也很相似，在Pn速度高的地区地壳Q0值亦高，在Pn速度低的地区Q0值亦低.
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| 关 键 词： | 衰减特性 地壳 横波 Q0值 |
| 文章编号： | 0001-5733（2007）06-1740-08 |
| 收稿时间： | 2007-1-29 |
| 修稿时间： | 2007-01-29 |
Crustal S-wave Q estimated from ML amplitude I: attenuation in different tectonic regions of China |
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| WANG Su-Yun,PEI Shun-Ping,XU Zhong-Huai,ZHANG Guo-Min,YU Yan-Xiang,PAN Hua.Crustal S-wave Q estimated from ML amplitude I: attenuation in different tectonic regions of China[J].Chinese Journal of Geophysics,2007,50(6):1740-1747. |
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| Authors: | WANG Su-Yun PEI Shun-Ping XU Zhong-Huai ZHANG Guo-Min YU Yan-Xiang PAN Hua |
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| Institution: | 1.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;2.Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China;3.Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China |
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| Abstract: | S wave maximum amplitude and period data reported in the Annual Bulletin of Chinese Earthquakes are used to study the S wave attenuation in crust and the regional variation of material quality factor Q_0 in China.We obtained an average Q_0(Q at 1 Hz) value of 367 for the entire area of China.The highest values of regional Q_0 we found are 460 for the South China platform,442 for the Tarim basin and 419 for the Ordos plateau,while we obtained a lower regional Q_0 of 294 for North China,and a similarly low value of 295 for the Sichuan-Yunnan region.Our results indicate that for tectonically stable cratonic regions,such as the Tarim basin,Ordos plateau and South China platform,Q_0 is usually high,in contrast,for tectonically active regions,such as the deforming Sichuan-Yunnan shear zone that lies on the eastern margin of the Tibetan plateau,and the extensional North China basin,the Q_0 is generally low.This regional Q_0 variation closely parallels the observed Pn velocity patterns: in regions of fast Pn velocity the S wave Q_0 is high,while the regions having slow Pn velocity often exhibit a low Q_0. |
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| Keywords: | Attenuation Crust S-wave Q_0 value |
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