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CHEN PEISHANup, ZUO ZHAORONGup, XIAO HONGCAIup2=/. 1988: SURFACE WAVE MAGNITUDE DETERMINED FROM RECORDS 763 LONG PERIOD SEISMOGRAPH NETWORK. Acta Seismologica Sinica, 10(1): 11-24.
Citation: CHEN PEISHANup, ZUO ZHAORONGup, XIAO HONGCAIup2=/. 1988: SURFACE WAVE MAGNITUDE DETERMINED FROM RECORDS 763 LONG PERIOD SEISMOGRAPH NETWORK. Acta Seismologica Sinica, 10(1): 11-24.
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SURFACE WAVE MAGNITUDE DETERMINED FROM RECORDS 763 LONG PERIOD SEISMOGRAPH NETWORK

  • 1. Institute of Geophysics, State Seismological Bureau; 2. Nanjing Seismic Station, Jiangsu Province

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  • Published Date: September 01, 2011
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    • Abstract
  • The calibration function for surface wave magnitude has been deduced theoretically from surface wave propagation in a layered medium, considering the effect of the linear filter composed of medium absorption, layered earth medium and response of the 763 long period seismograph on the amplitude and period of surface waves: 763(△) =3.9 + 0.16△/Tp + 1/31g△ + l/21g(sin△) + lgTp(1p is period corresponding to Airy phase (i.e. maximum amplitude of surface wave). This calibrating function is consistent with IASPEI(△) recommended by IASPEI at epicentral distance range 20-160 and able to fit quite well with observed data in the broader range 2-178. Extension of epicentral and period ranges for IASPEI(△) has been effected. This case is important for China because most earthquakes occurring in China and recorded by Chinese seismic network are at epicentral distances of 1 -20.The surface wave magnitudes Ms,763 determined in terms of 763(△) for 103 earthquakes recorded by 763 long period seismic network in China have been calculated. The standard deviation is 0.14 magnitude unit, less than that (0.20) measured by median period broadband seismograph (SK) network. In comparison with Msz measured by NEIS using WWSSN, it is shown that there is no systematic difference between Ms,763 and Msz statistically, i.e. the average value of △Ms = Ms,763-Msz, is close to zero (0.009) The standard deviation of △Ms is 0.21.
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    • References (1)
  • [1] Ben——Menahem, A.; M. Rosenman and D. G. Harkrider, Fast evaluation of source paramenter from isolated surface——wave signals, Bull. Seism. Sod. Am., 1970, 60, 1337——1387.

    [2] Harkrider, D. G., Surface wave in multilayered elastic media part II Higher mode spectra and spectral radio from point source in plane layered earth models, Bull. Seism. Sac. Am., 1970, 60, 1937——1987.

    [3] Aki, K. and P. G. Richards, Quantitative Seismology theory and methods, Chap. 7, 259——335, 1980, W. H.Freeman and Company.

    [4] Nuttli, O. W., Seismic wave attenuation and magnitude relations for Eastern North America, J. Geophys.Res., 1973, 78, 876——885.

    [5] Evernden, J. F., Variation of Rayleigh wave amolitude with distance, Bull. Seism. Soc. Am., 1971, 61,231——240.

    [6] Kanamori, H. and J. W. Given, Use of long——period surface waves for fast determination of earthquake source parameters, Phys. Earth Planet. Inter., 1981. 27. 8——31.

    [7] Anderson, D. L. and J. W. Given, Absorption band Q model for the earth, J. Geophys. Rer., 1982, 87, BS3893——3904.

    [8] 陈培善、胡瑞华、周坤根、李文香,中国大陆地区的均一震级系统,地震学报,19,i4, 6, 369——394,

    [9] 陈培善、胡瑞华、周坤根、李文香,面波震级的量规函数和台毖校正值,地震学报,1984, 6,增刊,510——524.

    [10] 陈培善、叶文华,论中国地震台,J测得的面波震级,地球物理学报,1987, 30, 39——51.

    [1] Ben——Menahem, A.; M. Rosenman and D. G. Harkrider, Fast evaluation of source paramenter from isolated surface——wave signals, Bull. Seism. Sod. Am., 1970, 60, 1337——1387.

    [2] Harkrider, D. G., Surface wave in multilayered elastic media part II Higher mode spectra and spectral radio from point source in plane layered earth models, Bull. Seism. Sac. Am., 1970, 60, 1937——1987.

    [3] Aki, K. and P. G. Richards, Quantitative Seismology theory and methods, Chap. 7, 259——335, 1980, W. H.Freeman and Company.

    [4] Nuttli, O. W., Seismic wave attenuation and magnitude relations for Eastern North America, J. Geophys.Res., 1973, 78, 876——885.

    [5] Evernden, J. F., Variation of Rayleigh wave amolitude with distance, Bull. Seism. Soc. Am., 1971, 61,231——240.

    [6] Kanamori, H. and J. W. Given, Use of long——period surface waves for fast determination of earthquake source parameters, Phys. Earth Planet. Inter., 1981. 27. 8——31.

    [7] Anderson, D. L. and J. W. Given, Absorption band Q model for the earth, J. Geophys. Rer., 1982, 87, BS3893——3904.

    [8] 陈培善、胡瑞华、周坤根、李文香,中国大陆地区的均一震级系统,地震学报,19,i4, 6, 369——394,

    [9] 陈培善、胡瑞华、周坤根、李文香,面波震级的量规函数和台毖校正值,地震学报,1984, 6,增刊,510——524.

    [10] 陈培善、叶文华,论中国地震台,J测得的面波震级,地球物理学报,1987, 30, 39——51.
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