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文中使用了一个新的量规函数σ_(300)(Δ),它是基于面波传播理论,考虑了面波的几何扩散、非弹性吸收、频散衰减以及面波优势周期随震中距的变化导出的,取全球平均Q=300。在震中距Δ=20°—160°的范围内与IASPEI推荐的面波震级的量规函数σ_(IASPEI)(Δ)一致,又推广了σ_(IASPEI)(Δ)的震中距使用范围,从1.0°—179°,以及可使用的面波周期范围(7.5—30s),因此它更适合我国由中周期宽频带SK仪组成的台网情况。若采用此量规函数σ_(300)(Δ)和进行方位角改正,则可使我国台网测出的M_s与国际地震中心(ISC)测出的一致,震级误差降到0.19级,此误差与苏联台网的误差一样。
A new gauge function σ_ (300) (Δ) is used in this paper. It is based on the theory of surface wave propagation and takes into account the geometric diffusion, inelastic absorption, dispersion attenuation and the variation of dominant period of the surface wave with the epicenter distance , Take the global average of Q = 300. (IASPEI) (Δ) of surface wave magnitude recommended by IASPEI in the epicenter range from Δ = 20 ° to 160 °, the epicentral distance range of σ_ (IASPEI) (Δ) is generalized from 1.0 ° -179 °, and the available surface wave period range (7.5-30s), so it is more suitable for our country by the cycle broadband SK instrument consisting of the network situation. If this gauge function σ_ (300) (Δ) and azimuth correction are used, the M_s measured by our national network will be consistent with that of the International Seismological Center (ISC), and the magnitude error will be reduced to 0.19, The same error in the Soviet Union’s network.