【摘要】 区域b值通常是使用M≥1(3/4)级的历史地震资料拟合得到.但对历史地震资料缺失较多的地区,这种计算方法就存在较大问题.近十多年来有了较为完整丰富的仪器记录资料,本文提出用它们来弥补历史地震资料的不足,以渤海周围地区和区内两条地震带为例,用历史记载地震资料(M≥6)、仪器记录地震资料(2～1.5级)和1900年以来的5级和5.5级地震资料一起进行回归计算,得到研究区和各地震带的b值为0.71～0.77,F检验在α=0.05显著水平上通过,相关系数达到0.99以上.这说明历史地震和现代地震有着共同的活动规律,两种资料一起使用计算b值是可行的.本文为历史地震资料缺乏的地区确定区城b值,提供了一种较为实用的办法,这在工程地震及用地震危险性分析方法编制地震区划图方面都有实际的意义更多还原

【Abstract】 As a rule, regional b value can be got by fitting the historical seismicity data with magnitude greater than or equal to 4 3/4 However, this method is noneffective in the area where the historical seismicity data was scarce. This paper pointed out that the complete data recorded by morden instrument can make up for a loss of the historical seismicity data. Based on analysis of three sets data in the following, the historical seismicity data ( M≥6 ) , the instrumental records data ( M= 2 ～4.5 ) and the seismic data of magnitude 5.0 and 5.5 since 1900, taking the data of two seismic belts and around Bohai sea as examples, b values obtained by way of the linear regression are 0. 71 -0. 77 in the research area and seismic belts. With F- test at the obvious level of α= 0. 05, the correlation coefficient is over 0.99 . This fact can explain that the modern and historical seismicity have a common activity law.It is possible that calculating b value is available by means of both seismic data. This paper has provided an effective method to determine the regional b value. It is practical and significan for analysing seismic risk and drawing up a seismic zoning map.更多还原