摘要
为了表徵地震烈度沿不同方向衰减的不均匀性,常采用沿长轴与短轴方向分別统计分析的椭圆衰减关系。鉴于统计分析是分別进行的,它存在以下不足:沿长、短轴方向的关系式的标准差不相同;沿这两个方向烈度随震级增长或缩小的比例值不同;沿两个方向导出的震中烈度值也不相同,在靠近震中,震中距相同的地方由沿短轴方向关系式导出的烈度值有时要比沿长轴方向关系式导出的值高。这些现象都不与实际情况相吻合。本文建议在进行统计分析时考虑沿长、短轴方向数据的相关性,以克服上述不足之处,并以华北地震区的烈度椭圆衰减关系为例说明之。
In order to characterize the attenuation inhomogeneity of earthquake intensity along different directions, usually statistical analyses are car ried out separately along major axis and minor axis for elliptical attenuation relationship. Separate statistical analyses along major axis and minor axis will cause the following shortcomings, the standard deviations of the relationships along both major axis and minor axin will not be equal; the intensity ratings along both directions will not increase or decrease with the same proportion of magnitude; the epicentral intensities obtained from relationships of both directions will not be equal; at near field with the same epicentral distances the intensity rating obtained from relationship along minor axis sometimes will be higher than that obtained from relationship along major axis. Those phenomena do not fit the real world. In this paper, it is suggested that in statistical analyses, the correlation of the data along major axis and minor axis should be considered in order to overcome above mentioned shortcomings. A case study for elliptical attenuation relationship of earthquake intensity in North China seismic region is illustrated,
出处
《华北地震科学》
北大核心
1989年第3期31-42,共12页
North China Earthquake Sciences
