用代数重建法反演地震面波品质因数Q值空间分布  

Inversion of Spatial Distribution of Surface wave′s Q value by Using Algebraic Reconstruction Technique

作　　者：郭履灿[1,2] 闻则刚[1,2] 杨辉[1,2] 

机构地区：[1]国家地震局地球物理研究所 [2]北京大学地球物理系

出　　处：《CT理论与应用研究（中英文）》1996年第4期9-15,共7页Computerized Tomography Theory and Applications

摘　　要：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。The inversion of spatial distribution of surface wave′s Q value by using algebraic reconstruction technique(ART) method is introduced. At first, the calculation of a model is made and compared with the Q value distribution by the inversion of ART method, the simulation on computer shows that the relative deviation of Q value is 6 8% between these two cases. We introduce the formula given by S.J. Duda to get the relation between the absorption characteristic time t * and calibrating function of earthquake magnitude Ms and amplitude A period T & velocity U of corresponding surface waves, by many times of iterated reconstruction get the Q value distribution by using ART method, for the area within 25°-40°N and 100°-115°E.

关 键 词：地震波 反演面波 Q值 空间分布 代数重建算法 

分 类 号：P631.414[天文地球—地质矿产勘探]