| 由SK地震仪的尾波持续时间快速测定面波震级 |
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| 引用本文： | 陈培善,胡瑞华,周坤根,陈海通.由SK地震仪的尾波持续时间快速测定面波震级[J].地震学报,1988,10(3):247-256. |
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| 作者姓名： | 陈培善 胡瑞华 周坤根 陈海通 |
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| 作者单位： | 1. 国家地震局地球物理研究所
2. 国家地震局地震研究所 |
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| 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。
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| 关 键 词： | 面波震级 尾波 持续时间 快速测定震级 等效台基校正值 |
FAST DETERMINATION OF SURFACE WAVE MAGNITUDE M_s FROM DURATION OF CODA WAVES RECORDED BY SK SEISMOGRAPH |
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| Institution: | 1. Institute of Geophysics, State Seismological Bureau;
2. Institute of Seismology, State Seismological Bureau |
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| 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. |
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