由SK地震仪的尾波持续时间快速测定面波震级
FAST DETERMINATION OF SURFACE WAVE MAGNITUDE M_s FROM DURATION OF CODA WAVES RECORDED BY SK SEISMOGRAPH
-
摘要: 本文根据Aki提出的地震尾波是由于随机非均匀分布在地壳和上地幔中的散射体产生的反向散射结果,导出了持续时间的对数IgtDu在不太长的持续时间范围内与面波震级MS呈线性关系。用21个地震台的SK地震仪记录的129个地震资料统计得到如下关系式: 对水平向的tDu为 Ms=2.0 lgtDu——0.6(103Du3s,5.4ss=1.5 lgtDu+0.9 (60Du3s,3.5sDu为 Ms=2.0lgtDu——0.5 (103Du3s,5.5ss=1.5lgtDu。+1.0 （3.5ss。Abstract: We have derived the linear relations between the logarithm of duration of coda waves lg(tDu) and surface wave magnitude Ms for not very large duration, based on the theory given by Aki (1969). He suggested that the coda is a result of superposition of backscattered waves from numerous randomly distributed heterogeneities in the crust and upper mantle.From the statistical results of data of 129 earthquakes recorded at 21 seismic stations the following relations are obtained:Ms = 2.0lgtDu - 0.6 (103Du 3s,5.4 s s = 1.5lgt + 0.9 (60 3s,3.5 s= 2.0lgtDu - 0.5 (103Dul3s, 5.5 s s = 1.5lgtDu + 1.0 (3.5 s s can then be quickly determine directly from the duration according to the above relations.
-
-
[1] Btsztricsany, E. A., A new method for the determination of magnitude of earthquakes, Geofiz. Kozl., 1958.7, 69——96.
[2] Solovicv, S. L., $eismicity of Sakhalin, Bull. Earthyua JRes. Insr., Tokyo Univ., 1965, 43, 95——102,
[3] Tsumura, K., Detcmination of earthquake magnitude from total duration of oscitllation, Bull. Earthqunkes Res. Inst., Tokyo Univ., 1967, 45, 7——18.
[4] Lee, W. H. K., R. E, Bennet, and K. L. Meaghe:、A method of estimating magnitude of local earthquakes from signal duration, U. S. Geol. Surv., Open——Filc Rrpnrz., 1972, 28.
[5] Real, C. R, and T. L. Teng, Local Richter magnitude and total signal duration in southern California,Bull. Seism. Soc. Amen, 1973, 63, 1809——1327.
[6] Aki, K. Analysis of the seismic coda of local earthquakes as scattered waves, J. Geophys. Res., 1969, 74,615——631
[7] Prishan, C,U. W. Nuttli, Wenhua Ye, and Jiazheng Qin, Estimates of short——period Q values and seismie moments from coda waves for earthquakes of the Beijing and Yun——non regions of China, Bull. Seism. Soc.ilmcr., 1984, 74, 1189——1207.
[8] Hanks, T. C. and H. kanamori, A moment magnitude scale, J. Geophys. Res., 1977, 84, 2348——2350.
[9] 秦嘉政、陈培善,用地震波的持续时间测定川滇地区的近震震级,地震学报,1984,6,58——65,
[10] 陈培善、刘祖荫、阐荣举、秦嘉政,由中小地震的震级Mt,和Ms估算197。年通海地震前后其周围地区的剪应力值,地震学报,1982,4,227——238,
[11] 陈培善、胡瑞华、周坤根、李文香,面波震级的量规函数和台基校正值,地震学报,1984,6,增刊,510——524,
[12] 陈培善、叶文华,论中国地震台网测得的面波震级,地球物理学报,1987,30,39——51,[1] Btsztricsany, E. A., A new method for the determination of magnitude of earthquakes, Geofiz. Kozl., 1958.7, 69——96.
[2] Solovicv, S. L., $eismicity of Sakhalin, Bull. Earthyua JRes. Insr., Tokyo Univ., 1965, 43, 95——102,
[3] Tsumura, K., Detcmination of earthquake magnitude from total duration of oscitllation, Bull. Earthqunkes Res. Inst., Tokyo Univ., 1967, 45, 7——18.
[4] Lee, W. H. K., R. E, Bennet, and K. L. Meaghe:、A method of estimating magnitude of local earthquakes from signal duration, U. S. Geol. Surv., Open——Filc Rrpnrz., 1972, 28.
[5] Real, C. R, and T. L. Teng, Local Richter magnitude and total signal duration in southern California,Bull. Seism. Soc. Amen, 1973, 63, 1809——1327.
[6] Aki, K. Analysis of the seismic coda of local earthquakes as scattered waves, J. Geophys. Res., 1969, 74,615——631
[7] Prishan, C,U. W. Nuttli, Wenhua Ye, and Jiazheng Qin, Estimates of short——period Q values and seismie moments from coda waves for earthquakes of the Beijing and Yun——non regions of China, Bull. Seism. Soc.ilmcr., 1984, 74, 1189——1207.
[8] Hanks, T. C. and H. kanamori, A moment magnitude scale, J. Geophys. Res., 1977, 84, 2348——2350.
[9] 秦嘉政、陈培善,用地震波的持续时间测定川滇地区的近震震级,地震学报,1984,6,58——65,
[10] 陈培善、刘祖荫、阐荣举、秦嘉政,由中小地震的震级Mt,和Ms估算197。年通海地震前后其周围地区的剪应力值,地震学报,1982,4,227——238,
[11] 陈培善、胡瑞华、周坤根、李文香,面波震级的量规函数和台基校正值,地震学报,1984,6,增刊,510——524,
[12] 陈培善、叶文华,论中国地震台网测得的面波震级,地球物理学报,1987,30,39——51,
计量
- 文章访问数:
- HTML全文浏览量:
- PDF下载量:
下载:
