利用半参数模型求解板块运动参数

PLATE MOVEMENT PARAMETER DETERMINATION WITH SEMIPARAMETRIC MODEL

为避免最小二乘法求解板块运动参数的诸多不足,建立了基于补偿最小二乘原理的半参数板块运动模型,并利用最新的ITRF2005速度场求解出全球各主要板块运动的欧拉矢量。结果表明,利用半参数模型求解板块运动参数,在观测台站数目较多且分布较均匀的情况下,与NNR-NUVEL1A模型的解算结果具有较好的一致性;较之于最小二乘方法,半参数板块运动模型的解释能力更强。

In order to surmount many deficiencies in determining the parameters of plate movement by least square （LS） method, we have set up a semiparametric model based on compensated LS principle. With this model, the Euler vectors of the main plates were calculated by use of the ITRF2005 velocity. Through comparison with the NNR-NUVEL1A model we found that both of these models are consistent with each other when the observation stations are symmetrically distributed and the station numbers are enough. Moreover, the semiparametric model has more expositive capabilities than that of the LS method.