CAJ | 학술논문

利用云南省地震局遥测台网记录的地震波形资料,采用多流逝时间窗分析方法,得到了云南地区不同台站的散射衰减和吸收衰减,并通过单次散射模型得到了不同台站的尾波衰减.研究结果显示,云南地区的散射衰减、吸收衰减、总衰减和尾波衰减空间分布以金沙江-红河断裂带为界,均表现出西部低,东部高的特征.云南地区地震波衰减以吸收为主,2～4 Hz、4～8 Hz、8～16 Hz三个频带各台站的吸收衰减Q1-1均大于散射衰减Qs-1,1～2 Hz除个别台站的吸收衰减明显小于散射衰减,其它台站均大于或接近散射衰减.尾波衰减Qc-1在1～2 Hz稍大于吸收衰减而小于总衰减,在2～4 Hz、4～8 Hz、8～16 Hz与总衰减接近,个别台站大于总衰减Qt-1.云南地区散射衰减与频率的关系为Qs=0.0138f-1.61,吸收衰减与频率的关系为Qi-1=0.0119f-0.86,总衰减与频率的关系为Qt-1=0.0247f-1.1,尾波衰减与频率的关系为Qc-1=0.0129f-0.71.与世界其它地区相比,云南地区的散射衰减处于中等偏低的水平,吸收衰减处于中等偏高的水平.
이용운남성지진국요측태망기록적지진파형자료,채용다류서시간창분석방법,득도료운남지구불동태참적산사쇠감화흡수쇠감,병통과단차산사모형득도료불동태참적미파쇠감.연구결과현시,운남지구적산사쇠감、흡수쇠감、총쇠감화미파쇠감공간분포이금사강-홍하단렬대위계,균표현출서부저,동부고적특정.운남지구지진파쇠감이흡수위주,2～4 Hz、4～8 Hz、8～16 Hz삼개빈대각태참적흡수쇠감Q1-1균대우산사쇠감Qs-1,1～2 Hz제개별태참적흡수쇠감명현소우산사쇠감,기타태참균대우혹접근산사쇠감.미파쇠감Qc-1재1～2 Hz초대우흡수쇠감이소우총쇠감,재2～4 Hz、4～8 Hz、8～16 Hz여총쇠감접근,개별태참대우총쇠감Qt-1.운남지구산사쇠감여빈솔적관계위Qs=0.0138f-1.61,흡수쇠감여빈솔적관계위Qi-1=0.0119f-0.86,총쇠감여빈솔적관계위Qt-1=0.0247f-1.1,미파쇠감여빈솔적관계위Qc-1=0.0129f-0.71.여세계기타지구상비,운남지구적산사쇠감처우중등편저적수평,흡수쇠감처우중등편고적수평.
The scattering and the intrinsic attenuations below stations in the Yunnan area are obtained by using the earthquake waveform data recorded through the remote digital seismic network of the Earthquake Administration of Yunnan Province,and by adopting the multiple lapse time window analysis method.The code attenuation of different stations is obtained through the single scattering model.The study result shows that,as for the spatial distribution of scattering attenuation,intrinsic attenuation,total attenuation and code attenuation,the Jinshajiang-Honghe fault serves as the border between low attenuation in the western area and high attenuation in the eastern area.The earthquake wave attenuation in the Yunnan area is mainly intrinsic,since the intrinsic attenuation Qi-1 of all stations is larger than the scattering attenuation Qs-1 on three respective frequency bands of 2～4 Hz,4～8 Hz and 8～16 Hz,while on the frequency band of 1～2 Hz,the intrinsic attenuation of individual stations is obviously smaller than the scattering attenuation but the intrinsic attenuation of most stations is larger than or equal to the scattering attenuation Qs-1.The code attenuation Qc-1,on the frequency band of 1～2 Hz,is slightly larger than the intrinsic attenuation but smaller than the total attenuation,while the code attenuation Qc-1,on the frequency band of 2～4 Hz,4～8 Hz and 8～16 Hz,is close to the total attenuation and,at individual stations,is larger than the total attenuation.The relationship between the scattering attenuation and the frequency in the Yunan area can be expressed as Qs-1=0.0138f-1.61;for the intrinsic attenuation and the frequency,it isQ1-1=0.0119f-0.86;and for the total attenuation and the frequency,it is Qt-1=0.0247f-1.1;for the code attenuation and the frequency,it is Qc-1=0.0129f-0.71.Compared with other areas worldwide,the scattering attenuation in the Yunan area is of a lower middle level and the intrinsic attenuation is of an upper middle level.