中国地区地震P波和S波走时表
P AND S TRAVEL TIMES FROM EARTHQUAKES IN THE CHINESE REGION
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摘要: 本文搜集了1952-1971年发生在我国境内及边境地区266次地震的观测资料,得到国内外五百多个地震台的 P 和 S 震相到时约二万条;根据我国地区大爆炸观测及其他地壳结构的研究成果,结合上述地震观测资料,提出了中国地区双层平均地壳速度模型,以便由深度走时校正把各种震源深度上的走时折算为表面震源走时,并进行剥壳处理.用迭代法校正震中和发震时刻.采用1970年寇蒂斯(curtis)所述的立方样条函数平滑数据的方法,得到表面震源 P 波和 S 波的走时表.运用海格劳兹-维谢尔特-贝特曼(Herglotz-Wiechert-Bateman)速度反演的方法求得中国地区地幔中,P 波和 S 波速度随深度的分布.算出震中距离=0-104,各种震源深度的一整套 P 波和 S 波走时表.经过试用的实践表明,用它来测定震中参数比用国外的走时表具有较高的精确度.Abstract: In this work, we collected the observed data of 266 earthquakes occurred in China and its bordering region during the years 1952-1971. A total of some 20,000 arrivals of P and S waves were available from more than 500 seismological stations at home or abroad. In order to reduce the travel time data of all earthquake focal depths to that of surface foci, and to strip the earth's crust, a 2-layer average velocity model of the crust for the region was proposed based on observations of large explosions and results of some other studies of crustal structure, combined with the above mentioned data of seismological observations. All of the earthquake epicenters and origin times have been revised by an iteration procedure. The smoothing technique of cubic splines as described by Curtis (1970) was applied for the P and S travel times for surface foci. The Herglotz-Wiechert-Bateman method was used to inverse P and S velocity distribution with depths in the mantle for this region. Finally, a set of travel times tables of P and S waves for various focal depths were constructed in the epicentral distance range of △= 0-104. Practical experiences show that the new tables have been relatively improved in accuracy for epicentral location of earthquakes of this region than other tables.
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[1] Jeffreys, Sir Harold and K.E. Bnllen (1940). Seismological Tables, Brit.Assn Gray——Milne Trust.及1970年重印版.
[2] W. Tucker, E. Herein and H W. Freedman Statistical aspects of the estimation of seismic travel times Bull.seism.Soc.Am.,58,1243——1260,1968
[3] E.R.Engdahl, J. N. Tagga.rt, Jolin L. Lobdell, E. P. Arnold and G. E. Clawson, Compnta tional methods, Bull. Seism. Soc,Am., 58, 1339——1344, 1968.
[4] E. Ilerrin, Introduction to“1968 Seismological Tables for P phases", Bull. Seism. Soc.Am, 58,1193——1241 1968.
[5] 曾融生、滕吉文等,我国西北地区地壳中的高速夹层,地球物理学报,14,,94——106, 1965
[6] 滕吉文等,柴达木东盆地的深层地震反射波和地壳构造,地球物理学报,17, 2, 122——134, 1974.
[7] 滕吉文、陈学波等,华北平原中部地区深部构造背景及邢台地震(一),地球物理学报,17,4, 255——271, 1974.
[8] 中国科学院地球物理研究所,临汾盆地地壳界面的反射波和地壳结构,地球物理学报,17, ", 239——245,1974.
[9] 宋仲和、谭承业,用瑞雷和乐夫面波群速度确定我国地壳厚度,地球物理学报,14, 1, 33——43, 1965.
[10] 曾融生、宋子安,我国境内瑞雷波的相速度,地球物理学报,12, 2, 143——165, 1963.
[11] 丁韫玉,SP',波与我国地壳厚度,地球物理学报,14, 3, 168——171, 1965.
[12] 孙广忠、吕梦麟,地壳结构的轮廓和形成,地质科学,4, 331——340, 1964.
[13] 刘正荣,用宏观方法测定震源深度的量板,地球物理学报,10, 2, 1961.
[14] M. J. Randall, A revised travel time for S, Gecplays. J., R. Astr. Soc., 22, 229——334, 1971.
[15] A. R.. Curbs and M. Shimshoni, The smoothing of seismological travel time tables using cubic spumes., Bull. Seism. Soc, 9rn., 60, 1077——1087, 1970.
[16] K. E. Bullen, The Earth's Density, London, Chapman and Hall, 1975.
[17] R .C. Agrawal, Travel times of P from deep——focus Indian eartliquakes, Pleys. Earth Plantet. Zest.,17, 232——248, 1978.
[18] R .C. Agrawal. S times from deep——focus Indian earthquakes, Geophys, J. R. astr. Soc., 54,461——473, 1978.
[19] M. A. Enayatollah, Travel times of P——waves for the Swedish——Finnish Seismograpli Network, Pur.&Appl. Geophys., 94, 101——135, 1972.
[20] 国家地震局地球物理所编,新编地震走时表,地震出版社,1980年.
[21] 国家地震局地球物理所九室编,震相便查表,地震出版社,1980年.[1] Jeffreys, Sir Harold and K.E. Bnllen (1940). Seismological Tables, Brit.Assn Gray——Milne Trust.及1970年重印版.
[2] W. Tucker, E. Herein and H W. Freedman Statistical aspects of the estimation of seismic travel times Bull.seism.Soc.Am.,58,1243——1260,1968
[3] E.R.Engdahl, J. N. Tagga.rt, Jolin L. Lobdell, E. P. Arnold and G. E. Clawson, Compnta tional methods, Bull. Seism. Soc,Am., 58, 1339——1344, 1968.
[4] E. Ilerrin, Introduction to“1968 Seismological Tables for P phases", Bull. Seism. Soc.Am, 58,1193——1241 1968.
[5] 曾融生、滕吉文等,我国西北地区地壳中的高速夹层,地球物理学报,14,,94——106, 1965
[6] 滕吉文等,柴达木东盆地的深层地震反射波和地壳构造,地球物理学报,17, 2, 122——134, 1974.
[7] 滕吉文、陈学波等,华北平原中部地区深部构造背景及邢台地震(一),地球物理学报,17,4, 255——271, 1974.
[8] 中国科学院地球物理研究所,临汾盆地地壳界面的反射波和地壳结构,地球物理学报,17, ", 239——245,1974.
[9] 宋仲和、谭承业,用瑞雷和乐夫面波群速度确定我国地壳厚度,地球物理学报,14, 1, 33——43, 1965.
[10] 曾融生、宋子安,我国境内瑞雷波的相速度,地球物理学报,12, 2, 143——165, 1963.
[11] 丁韫玉,SP',波与我国地壳厚度,地球物理学报,14, 3, 168——171, 1965.
[12] 孙广忠、吕梦麟,地壳结构的轮廓和形成,地质科学,4, 331——340, 1964.
[13] 刘正荣,用宏观方法测定震源深度的量板,地球物理学报,10, 2, 1961.
[14] M. J. Randall, A revised travel time for S, Gecplays. J., R. Astr. Soc., 22, 229——334, 1971.
[15] A. R.. Curbs and M. Shimshoni, The smoothing of seismological travel time tables using cubic spumes., Bull. Seism. Soc, 9rn., 60, 1077——1087, 1970.
[16] K. E. Bullen, The Earth's Density, London, Chapman and Hall, 1975.
[17] R .C. Agrawal, Travel times of P from deep——focus Indian eartliquakes, Pleys. Earth Plantet. Zest.,17, 232——248, 1978.
[18] R .C. Agrawal. S times from deep——focus Indian earthquakes, Geophys, J. R. astr. Soc., 54,461——473, 1978.
[19] M. A. Enayatollah, Travel times of P——waves for the Swedish——Finnish Seismograpli Network, Pur.&Appl. Geophys., 94, 101——135, 1972.
[20] 国家地震局地球物理所编,新编地震走时表,地震出版社,1980年.
[21] 国家地震局地球物理所九室编,震相便查表,地震出版社,1980年.
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