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| Characteristics of coda wave attenuation in Yunnan area | |
| 作者姓名： | 王伟君 刘杰 陈凌 |
| 作者单位： | [1]Institute of Earthquake Sciences, China Earthquake Administration, Beifing 100036, China [2]China Earthquake Network Center, Beijing 100036, China [3]Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
| 基金项目： | Youth Seismological Science Foundation of China （140102-134-03） and the National Key Problem Tackling Pro gram of the tenth Five-year Plan （2004BA601B01-04-03）. |
| 摘 要： | The characteristic of seismic coda wave attenuation in Yunnan area in 7 frequency-bands range from 1 Hz to 20 Hz was estimated by using the local earthquake's waveform data recorded from 22 Yunnan digital seismic stations.Coda attenuation Q-c1 of each station was firstly calculated by single scattering method. Then, mean free path Le and seismic albedo Bo of each station were calculated, and scattering attenuation Q-1s and intrinsic attenuation Q-1i were separated from total attenuation Q-1t by multiple lapse time window analysis based on the multiple scattering model in uniform random isotropic scattering medium. The attenuating characteristics in Yunnan show that most value of Le are in 10～30 km, with maximal within 2～6 Hz;Bo are about 0.5 at 1～2 Hz, but less than 0.5at other frequency-bands, which means Q-1i is comparable with Q-1s at 1～2 Hz, and after 1～2 Hz, Q-1i is greater than Q-1s and dominates the attenuation process. Q-1c is close to Q-1i at other frequency bands except 1～2 Hz.Results show that Q-1 especially Qs-1 varies spatially, Q-1 in eastern Yunnan zone is a bit higher than in northwestern Yunnan zone;northwestern Yunnan zone higher than southwestern Yunnan zone. Comparing with other results in global, Qs-1 in Yunnan is lower than the global average value among these results, Q-1i is higher than the global average value, and Q-1t lies the middle among these results. |
| 文章编号： | 1000-9116（2006）01-0008-12 |
| 收稿时间： | 2005-05-30 |
| 修稿时间： | 2005-09-21 |
Characteristics of coda wave attenuation in Yunnan area |
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| WANG Wei-jun,LIU Jie,CHEN Ling.Characteristics of coda wave attenuation in Yunnan area[J].Acta Seismologica Sinica(English Edition),2006,19(1):8-19. | |
| Authors: | WANG Wei-jun LIU Jie CHEN Ling |
| Institution: | 1. Institute of Earthquake Sciences, China Earthquake Administration, Beijing 100036, China 2. China Earthquake Network Center, Beijing 100036, China 3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
| Abstract: | The characteristic of seismic coda wave attenuation in Yunnan area in 7 frequency-bands range from 1 Hz to 20 Hz was estimated by using the local earthquake’s waveform data recorded from 22 Yunnan digital seismic stations. Coda attenuation Q c −1 of each station was firstly calculated by single scattering method. Then, mean free path L e and seismic albedo B 0 of each station were calculated, and scattering attenuation Q s −1 and intrinsic attenuation Q i −1 were separated from total attenuation Q t −1 by multiple lapse time window analysis based on the multiple scattering model in uniform random isotropic scattering medium. The attenuating characteristics in Yunnan show that most value of L e are in 10–30 km, with maximal within 2–6 Hz; B 0 are about 0.5 at 1–2 Hz, but less than 0.5 at other frequency-bands, which means Q i −1 is comparable with Q s −1 at 1–2 Hz, and after 1–2 Hz, Q i −1 is greater than Q s −1 and dominates the attenuation process. Q c −1 is close to Q i −1 at other frequency bands except 1–2 Hz. Results show that Q −1 especially Q s −1 varies spatially, Q −1 in eastern Yunnan zone is a bit higher than in north-western Yunnan zone; northwestern Yunnan zone higher than southwestern Yunnan zone. Comparing with other results in global, Q s −1 in Yunnan is lower than the global average value among these results, Q i −1 is higher than the global average value, and Q t −1 lies the middle among these results. Foundation item: Youth Seismological Science Foundation of China (140102-134-03) and the National Key Problem Tackling Program of the tenth Five-year Plan (2004BA601B01-04-03). |
| Keywords: | coda attenuation intrinsic attenuation scattering attenuation Yunnan area |
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