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本文用代数重建(简称ART)法,反演面波的品质因数Q值分布;作了模型正演计算求得吸收特征时间t*,接着用这些t*求反演的Q值分布作比较,求出Q值的相对误差的空间分布在6-8%,说明这种方法用于Q值反演的正确性。用中国地震台网观测报告中振幅和周期,对1966年以后的518个地震事件,共3000多条射线,基于S.J.Duda提出的由震级起算函数的方法,计算每一条射线的t*,然后对中国中部地区,取经纬度范围在25°-40°N,100°-115°E,由ART法反演了面波Q值空间分布。
In this paper, the algebraic reconstruction (referred to as ART) method is used to invert the quality factor Q value distribution of surface wave; the absorption characteristic time t * is calculated by model forward calculation, and then compared with these Q * The spatial distribution of the relative error of the Q value is found to be 6-8%, which shows that this method is correct for the Q value inversion. Based on the amplitude and period of observation reports from China Seismological Network, a total of more than 3000 rays of 518 earthquakes after 1966 are based on S J. According to Duda’s method of magnitude function, the t * of each ray is calculated. Then for latitude and longitude of central China, the range of latitude and longitude is between 25 ° -40 ° N and 100 ° -115 ° E, and the surface wave Q value spatial distribution.