北京1990年大海坨山地震尾波Q－1sup>随时间的变化
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摘要: 利用中国数字地震台网(CDSN)北京台记录, 计算了北京地区1987年1月至1991年8月近90个地方震尾波Q－1,研究了大海坨山5.4级地震前后尾波Q－1随时间的变化和与该区地震活动性的关系。结果表明, 在频率1-16HZ、尾波持续时间10-60S内, 尾波Q－1在该期间出现明显的时间变化, 且与该区地震活动有关。在地震前后, 主震区的尾波Q－1值显示出震前低震后高, 而在外部区域则为震前高震后低。同时发现, 尾波Q－1与频率的幂函数关系式Q－1=Q(f/f0)-中的幂次数及相当于频率1Hz时的品质因素Q0也随时间而变。实测结果表明, 三个分向的尾波Q－1在各频率上随时间的变化表现并不一致。
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[17] Su, F. and Aki, K., 1990. Temporal and spatial variation on coda口——' associated with the North Palm Springs earthquake of July 8, 1986. Pure Appli. Geoyhys., 133, 23——52.[1] 程乾生(编)。1982.信号数字处理的数学原理, 79——90.石油工业出版社, 北京.
[2] 华正兴、高龙生、舒曦, 1991.内蒙古中部和新疆乌恰地区尾波P及其随时间的变化.地震, 6: 31——41.
[3] 高龙生、石汝斌、华正兴、李瑞暄, 1986.唐山一北京地区Q因子随频率的变化.地震学报, 8, 354——366.
[4] 郑治真(编)。1983.波谱分析基础, 197——206.地震出版社, 北京.
[5] 周概容(编), 1987.概率沦与数理统计, 993——509.车教存出版社.北京.
[6] Aki, K., 1989.地震强震動の预测.国立防災科学技术セ, ヌ——研究速报, 80: 1——3.
[7] Aki, K., 1991. Summary of discussions on coda waves at the Insianbul IASPEI meeting. Phys. Earth Planet. Inter., 67, 1——3.
[8] Aki. K. and Chouet. B., 1975. Origin of coda waves: Source,attenuation and scattering effect. J. Geoyhys. Res., 80, 3322——3342.
[9] Correig, A. M., Mitchell, B. J. and Ortiz, R., 1990. Seismicity and coda Q values in the eastern Pyrenees; first results from the La Cerdanya seismic network. Pure Ayyle. Ggophys., 132. 311——329.
[10] Frankel.A. and Wennerberg,L., 1978, Energy——flux model of seismic coda, separation of scattering and intrinsic attenuation. Bull. Sexsm. Soc. Amer. 77. 1223——1251.
[11] Gao, L. S. and Li, S. L., 1990. Time domain solution for multiple scattering and envelopes. Pure Applz. Geophys., 132, 123——150.
[12] Jin, A. and Aki,K., 1989, Spatial and temporal correlation between coda Q——1 and seismicity and its physical mechanism. J. Geophys. Res., 94, 19091——19059.
[13] Peng, J. Y., Aki, K., Lee, W. H., Chouet, B., Johnson, P., Marks, S., Newberry, J. T., Ryal, A. S., Stewart, S. W. and Tottingham, D. M., 1987. Temporal change in coda心associated with the Round Va11ey,California, earthquake of November 23, 1989. J. Geophys. Bes., 92, 3507——3536.
[14] Pulli, J., 1989. Attenuation of coda waves in New England. Bull. Sexsm. Suc. Araer., 74, 1149——1166.
[15] Sato, H., 1977. Energy propagation including scattering effect; single isotropic scattering approximation. J. Phys. Earth., 25, 27——41.
[16] Sato, H., 1988a. Temporal change in scattering and attenuation associated with the earthquake occurrence——a review of re—— cent studies on coda waves. Pure ApPlx. Geophys., 129, 465——998.
[17] Su, F. and Aki, K., 1990. Temporal and spatial variation on coda口——' associated with the North Palm Springs earthquake of July 8, 1986. Pure Appli. Geoyhys., 133, 23——52.
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