利用洛阳地震台1985 ～ 2003 年记录的1755 个地震的面波资料，采用与国家地震台网中心相同的面波震级公式，研究了该台测定的面波震级与国家地震台网中心测定面波震级之间的偏差。结果表明，洛阳地震台测定面波震级的偏差与震中距之间有明显的相关性，在1°≤Δ≤130°范围内面波震级由偏小0. 1 逐渐变化到偏大，Δ≥20°时偏大0. 2 ～ 0. 3;在130° ＜ Δ≤180°范围内偏大0. 2。

The surface wave magnitudes of 1755 earthquakes from 1985 to 2003，determined by the Luoyang seismic station with the same surface wave magnitude formula as the one China Earthquake Networks Center uses，are compared with the CENC earthquake catalogue． The result shows that，the surface wave magnitude deviation of Luoyang seismic station is closely related to the epicentral distance． The magnitude deviation is from smaller than 0. 1 to larger in the epicentral range of 1°≤Δ≤130°; it is 0. 2 ～ 0. 3 larger in the range of 20° ＜ Δ≤130°; the deviation is 0. 2 larger in the range of 130° ＜ Δ≤180°．

地震行业科研专项(200708024)资助