【摘要】 用常规方法计算得到 1 970～ 1 999年华北 b值全时空扫描结果 ,详细分析了影响结果可靠性的多种因素 ,用模糊相关分析方法得到不同参数计算的 b值与对应地震震级的模糊矩阵和模糊推理结果。认为 ,当用 2°× 2°进行全时空扫描时 ,不能提取出 b值异常指标。以地震为研究对象划定研究区 ,结果显示 ,有异常有地震的信息明显高于有异常无地震的信息量 ,可取 b<0 .65为异常指标更多还原

【Abstract】 Authors have got the time space scanning results of b values from 1970～1999 in North China, they analyzed in detail several elements influencing reliability of the results, and obtained fuzzy matrixes and fuzzy results as well. The results show that anomalous indices of b values cannot be determined in the whole time space range of 2°×2° unit. However, when the seismic anomalous information is bigger than aseismic one, and the research ranges are selected considering the epicenter of earthquake with M ≥5.0 and its neighboring area, b <0.65 can be taken as the anomalous indices.更多还原