海城地区地震波的衰减特征

李兴才1, 顾浩鼎2

海城地区地震波的衰减特征

李兴才1, 顾浩鼎2

1. 国家地震局地球物理研究所 2. 辽宁省地震局

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- 发布日期: 2011-08-31

ON THE ATTENUATION OF SEISMIC WAVES THROUGH THE HAICHENG EARTHQUAKE AREA

LI XING-CAIup, GU HAO-DINGup2com s

1. Institute of Geophysics, State Seismological Bureau; 2. Seismological Bureau of Liaoning Province

摘要

摘要: 本文用文献[1]的结果计算了可以用多台P初动振幅测定Q值的理论曲线, 并使用海城地震的部分余震的资料测定了海城地区地壳上层介质的Q值.通过与由 P_n 资料得到的上地幔顶部介质的 Q_M 值比较, 并对 P_n、P初动半周期进行统计表明, 海城地震区东南部上地幔顶部介质的衰减特征与其他地区的不大相同, 与地壳上部介质的衰减特征也不一样, 说明那里深部物质的熔化程度可能比其他地方的物质的熔化程度高.

Abstract: From the results of [1] a set of theoretical curves used to determine the Q-value by means of the amplitudes of first P arrivals recorded at many stations are obtained in this paper. A portion of the aftershock data of the Haicheng earthquake of 1975 has been employed to determine the Q-value of the upper crust of the Haicheng region. Comparison with the Q_M-value of the top part of the upper mantle in this area obtained by the first P_n amplitudes data recorded at stations on the Liaodong Peninsula from some aftershocks of the 1976 Tangshan Earthquake sequence as well as some statistical results for the first half period of P and P_n suggest that there exist a difference in attenuation of the top part of the upper mantle between the southeastern portion of the Haicheng Earthquake region and other regions. This may imply that the deep materials there are melted in higher degree than in other parts of the area.

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参考文献(1)

[1] 陈运泰等, 巧家、石棉的小震震源参数的测定及其危险性的估计, 地球物理学报, 19, 3, 1976.

[2] G. C. Werth, R. F. Gerbst and D. L. 8pringer, Amplitudes of seismic arrivals from the M discontinuty, J. GeoPhys. Res., 67, 4, 1587—1610, 1962.

[3] M. T. Gladwin and F. D. Stecey, Anelastic degradation of acoustic pulses in rock, Phys. Earth Planet Interiors 8, 332—336, 1974.

[4] L. Reiter 等, Variation in initial pulse width as a function of anelastic properties and surface geology in central california, Bull. Seism. Soc. Am., 60, 5, 1547—1559, 1970.

[5] 顾浩鼎等, 1975年2月4日辽宁省海城地震的震源机制, 地球物理学报, 19, 4, 270—284, 1976.

[6] P. A. Heelan, On the theory of head waves. Geophys., 18, 871—893, 1953.

[7] R. Ryall and J. Dorman, Travel time and amplitudes from nuclear explosions, Naveda Test Site to Ordway, Colorado, J. Geophys., Res., 68, 20, 5821—5838. 1963.

[8] Y. V. Ramana and M. V. M. S. Rao, Q by pulse broading in rocks under presure, Phys. Earth Planet Interiors 8, 337—341, 1974.

[9] C. B. Archamheau, E. A. Flim and D. G. Lambert, Fine structure of the upper mantle, J. Geophys. Res., 74, 25, 5825—5863, 1969.

[10] Z. A. Der and T. W. Mcelfresh, The relationship between anelastie attenuation and regional amplitude anomalies of abort—period P waves North America, Bull. Seism. Soc. Am., 67, 5, 1303—1317, 1977.

[11] W. D. Stuart and M. J. S. Johnston, Intrusive origin of the Matsushiro earthquake Swarm, Geology., 3, 2, 63—67, 1975.

[12] 陈运泰等, 1975年海城地震与1976年唐山地震前后的重力变化, 地震学报, 2, 1, 21—30, 1980.

[13] 林邦慧等, 不对称双侧震源破裂过程方法的探讨及其海城地震的应用, 地震学报, 1, 2, 133—149, 1979.

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文章访问数: 1062
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海城地区地震波的衰减特征

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ON THE ATTENUATION OF SEISMIC WAVES THROUGH THE HAICHENG EARTHQUAKE AREA

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