地震学报（英文版）2006，Vol.19Issue(1)：8-19,12.
Characteristics of coda wave attenuation in Yunnan area
Characteristics of coda wave attenuation in Yunnan area
摘要
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-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.关键词
coda attenuation/intrinsic attenuation/scattering attenuation/Yunnan areaKey words
coda attenuation/intrinsic attenuation/scattering attenuation/Yunnan area分类
天文与地球科学引用本文复制引用
..Characteristics of coda wave attenuation in Yunnan area[J].地震学报（英文版）,2006,19(1):8-19,12.基金项目
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). （140102-134-03）
