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根据1990～2000年《中国地震年报》和2001～2008年《中国数字地震台网观测报告》的大量数据,研究了测定面波震级MS与近震震级ML的不确定性;采用双随机变量的回归方法,用3种不同的数据组,获得二者之间的3组新的转换关系。结果表明,自20世纪70年代使用至今的公式MS=1.13ML-1.08严重偏离数据组,已不适用于新的数据。考虑到测定震级的不确定性及数据的离散性较大等因素,认为采用关系式MS=0.03+0.98ML作为新的经验关系更合理适用。
Based on a large amount of data from “China Earthquake Annual Report” from 1990 to 2000 and “China Digital Seismic Network Observation Report from 2001 to 2008”, the uncertainty of determining surface wave magnitude MS and near-earthquakes magnitude ML was studied. Using double random variables Regression method, using three different data sets, access to the three sets of new conversion between the two. The results show that the formula MS = 1.13ML-1.08, which has been used since the 1970s, has been severely deviated from the data set and is no longer suitable for new data. Taking into account the uncertainty of the measured magnitude and the large discrepancy of the data, it is more reasonable to adopt the relationship MS = 0.03 + 0.98ML as the new empirical relationship.