关键词: 震源参数, 近震震级, 面波震级

Abstract: The physical significance of earthquake magnitudes must be considered when studing the quantitative relationship between the source parameters and earthquake magnitudes. In this paper, a set of stable, uniform functional relations of the source fracture parameters to magnitudes M_L and M_s have been obtained by using the data of 151 smaller earthquakes (1.5≤M_L≤3.9) preceding and following Hai Cheng and Tangshan earthquakes as well as 58 moderate and strong shallow earthquakes(4.4≤M_s≤8.2) on the earth. The relation between the magnitudes M_L, M_s and m_b is discussed as well.The alternative relationship between the source fracture parametes and earthquake magnitudes shows no proportional one-to-one correspondence between the source fracture size of earthquake (i. e fault length, fault area or dislocation etc.) and surface wave magnitude M_s and local magnitude M_L.

Key words: Source parameter, Local magnitude, Surface wave magnitude