中国的地震烈度衰减率分区
REGIONALIZATION OF ATTENUATION OF SEISMIC INTENSITY IN CHINA
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摘要: 本文采用1900年至1980年发生在中国的198个地震的等震线图,用公式 lnIi/I0=a——blnRi——cRi计算了烈度随距离的衰减率。式中I0为震中烈度,Ri为某烈度Ii等震线昕围面积的等效半径。按上式结果可将中国分成12个区,对于等震线明显受构造控制的地区,用上式分别计算了沿等震线长、短轴方向上不同的衰减率。在近场区,采用了一个与深度有关的修正量（深度因子）D,将上式改写为 ln（Ii/I0）=a——bln（Ri+D）——cRi得出了更适用的结果。对所得的分区结果和上两式中各量的意义进行了某些研究。Abstract: In this paper, isoseismal maps of 198 Chinese earthquakes occurring between 1900 and 1980 were used in calculating the rate of attenuation of seismic intensity with distance by using the equation lnIi/I0=a-blnRi-cRi where I0 is the epioentral intensity, I1 is the equivalent radius of the area surrounded by the isoseismal of intensity A. As a result, China was divided into 12 regions. For regions in which the form of the isoseismals is apparently influenced by the tectonic background, attenuation of intensity along the major and the minor axes of the ellipses of seismals were calculated separately. For the near field, a depth-factor, D, was added, and the following equation was obtained lnIi/I0=a-bln(Ri+D)-cRi The results of regionalization and the effect of the different factors in the two equations were discussed.
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[1] Nuttli, O. W., Magnitude, intensity and ground motion relations for earthquakes in the Central United Slates,Proc. Inten. Conf. Microzonation, Seattle, Washinton, I, 1972, 307——318.
[2] Evernden, J. F., Seismic intensities, "size" of earthquakes, and related phenomena, Bull. Seism Soc. Amen,1975, 65, 1287——1315.
[3] Howell, B. F., and Schultz, T. R., Attenuation of Modified Mercalli intensify with distance from epicenter,Bull. Seism. Soc. rfmer., 1975, 65, 651——665.
[4] Кондорская, Н. В., Н, В. Шебалин. Новый Каталог Сильнх Землегрясений на Территорин СССР С Древнейших время До 1975 Г., М., 1977, Наука.
[5] Chandra, U., J. G. McWhorter., and A. A. Nowrouzi, Attenuation of intensities in Iran, Bull. Seism. Soc.Amen, 1979, 69, 237——250.
[6] 周炳荣、肖桂清,云南地震烈度随距离的衰减规律,地震研究,1983 4,673——684
[7] Chen, P. S., and O. W. Nuttli, Estimates of magnitudes and short——period wave attenuation of Chinrse earthquakes from M. M. intensity data, Bull. Seism. 5w. Anzrr,1984, 74, 957——968.
[8] Tilford, N. R., L. Chandra, D. C, Amick, R. Moran, and F. Snider, Attenuation of intensities and effect of local site conditions on observed intensities dureing the Corinth, Greece, earthquakes of 24——25 Fchrury and 4 March 1981, Bull. Seirm. Soc. Amen, 1985, 75, 923——937.
[9] 赵晓敏,中国地震烈度衰减规律的区域性特征(硕士论文),1985.
[10] 谢毓寿、蔡美彪,中国地震历史资料汇编,第五卷,1983,科学出版社.
[11] 谢毓寿、蔡美彪,中国地震历史资料汇编,第四卷,1985,科学出版社.
[12] 顾功叙,中国地震目录,1983,科学出版社.[1] Nuttli, O. W., Magnitude, intensity and ground motion relations for earthquakes in the Central United Slates,Proc. Inten. Conf. Microzonation, Seattle, Washinton, I, 1972, 307——318.
[2] Evernden, J. F., Seismic intensities, "size" of earthquakes, and related phenomena, Bull. Seism Soc. Amen,1975, 65, 1287——1315.
[3] Howell, B. F., and Schultz, T. R., Attenuation of Modified Mercalli intensify with distance from epicenter,Bull. Seism. Soc. rfmer., 1975, 65, 651——665.
[4] Кондорская, Н. В., Н, В. Шебалин. Новый Каталог Сильнх Землегрясений на Территорин СССР С Древнейших время До 1975 Г., М., 1977, Наука.
[5] Chandra, U., J. G. McWhorter., and A. A. Nowrouzi, Attenuation of intensities in Iran, Bull. Seism. Soc.Amen, 1979, 69, 237——250.
[6] 周炳荣、肖桂清,云南地震烈度随距离的衰减规律,地震研究,1983 4,673——684
[7] Chen, P. S., and O. W. Nuttli, Estimates of magnitudes and short——period wave attenuation of Chinrse earthquakes from M. M. intensity data, Bull. Seism. 5w. Anzrr,1984, 74, 957——968.
[8] Tilford, N. R., L. Chandra, D. C, Amick, R. Moran, and F. Snider, Attenuation of intensities and effect of local site conditions on observed intensities dureing the Corinth, Greece, earthquakes of 24——25 Fchrury and 4 March 1981, Bull. Seirm. Soc. Amen, 1985, 75, 923——937.
[9] 赵晓敏,中国地震烈度衰减规律的区域性特征(硕士论文),1985.
[10] 谢毓寿、蔡美彪,中国地震历史资料汇编,第五卷,1983,科学出版社.
[11] 谢毓寿、蔡美彪,中国地震历史资料汇编,第四卷,1985,科学出版社.
[12] 顾功叙,中国地震目录,1983,科学出版社.
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