测震定位中模型影响的数值实验

本文介绍了定位模型偏差对震源测定的影响的数值实验,结果表明:定位模型的偏差主要影响对浅源地震的深度的测定,对地壳下部地震深度的测定一般影响不大;如果定位模型比实际地壳结构简单,所测定的震源深度往往比实际深度偏大,反之定位的深度一般都偏浅;地壳总厚度的偏差使定位深度产生系统差,偏差和系统差基本一致;同一模型测定的深度值之间具有相对准确的定性意义,可以互相比较,不同模型测定的深度结果一般无此关系。文章最后对实验结果作了简要讨论。

THE NUMERICAL EXPERIMENTS ABOUT EFFECTS OF THE DEVIATION OF CRUSTAL MODEL USED IN LOCATION

It is presented that the numerical experiments about effect of the deviation of crustal model used in location on determining focus. Which results show that the model errors affect mainly the depths determination of shallower earthquakes in upper crust, whereas their effect on events in lower crust is few. The shocks determined will be deeper than that of actual ones when model used in location is simpler than that of true structure, on the contrary, the real depths will be deeper than that located. The deviation of total crust thickness will make focu depths calculated a system error which is in close proximity to the thickness deviation. Depths determined with a common model contain the relative accuraty, otherwise they is imcomparable. Finally, the experiment results is discussed briefly.