| 云南及周边地区Lg尾波Q值的分布特征 |
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| 引用本文： | 胡家富,丛连理,苏有锦,康国发.云南及周边地区Lg尾波Q值的分布特征[J].地球物理学报,2003,46(6):809-813. |
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| 作者姓名： | 胡家富 丛连理 苏有锦 康国发 |
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| 作者单位： | 1.云南大学地球科学系，昆明 650091 2 云南省地震局，昆明 650041 |
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| 基金项目： | 云南省自然科学基金 ( 98D0 0 3R)，国家自然科学基金 ( 4 99740 12 ,40 2 740 3 0 ) |
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| 摘 要： | 收集了昆明台1990～2000年间大于4.0级的地震宽频记录资料，以及分布在云南境内的23个昆明数字化台网1999～2000年的资料，使用单台叠加谱比方法处理了280个Lg尾波信号. 在假定Lg尾波Q与频率f有Q =Q0fη关系的基础上，计算出各射线1Hz时的Q值及频率相关因子η. 在此基础上，运用反投影技术反演得到云南及周边地区0.5°×0.5°网格内的Q0和η的分布图像. 结果表明：云南及周边地区的Q0在150～300之间变化，滇东地区的Q0明显高于滇西地区；η的变化范围在0.3～0.8之间，绝大部分地区η的变化范围为0.5～0.6.
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| 关 键 词： | Lg尾波 叠加谱比 反投影技术 Q成像 |
| 文章编号： | 0001-5733(2003)06-0809-05 |
| 收稿时间： | 2002-6-13 |
| 修稿时间： | 2003-6-13 |
DISTRIBUTION CHARACTERISTICS OF Q VALUE OF THE Lg CODA IN YUNNAN AND ITS ADJACENT REGIONS |
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| HU JIAFU.DISTRIBUTION CHARACTERISTICS OF Q VALUE OF THE Lg CODA IN YUNNAN AND ITS ADJACENT REGIONS[J].Chinese Journal of Geophysics,2003,46(6):809-813. |
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| Authors: | HU JIAFU |
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| Institution: | 1.Earth Science Department of Yunnan University，Kunming 650091, China 2 Seismological Bureau of Yunnan Province，Kunming 650041, China |
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| Abstract: | We have collected broadband seismograms of earthquakes with magnitudes greater than 4.0 recorded by the Kunming station during the period 1990～2000 and 23 Kunming digital network stations located in Yunnan province during the period 1999～2000. The total 280 Lg coda traces are studied using the stack spectral ratio (SSR) method. Supposing Q of Lg coda correlates with frequency, f by Q=Q0fη, the Q value at 1Hz, Q0 and η for each record are calculated. Based on the calculated results, the distribution maps of Q0 and η for 0.5°×0.5° cells are obtained using the back projection technique. The results indicate Q0 in Yunnan and its adjacent regions exhibits low values, varying between 150 and 300. Q0 in eastern Yunnan is higher than that in western Yunnan. η varies between 0.3 and 0.8. For most of the study regions η is within the range between 0.5 and 0.6. |
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| Keywords: | Lg coda Stack spectral ratio Back-projection technique Q tomography |
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