选用2008—2019年中国东北及邻区27次地震竖直向105条强震动记录，以三段式强度包络函数模型为目标，利用加权最小二乘回归方法，尝试建立了东北及邻区竖直向地震动时程强度包络函数参数的衰减公式，以使我国的地震动区域划分更具有普遍性。同以往的研究类似，上升段持时t1和平稳段持时ts的确定方法采用了70%能量持时法。所选地震的震级为3.3—5.8级，最大震中距为371 km。基于土层场地的竖直向记录，通过与我国目前常用的时程强度包络函数参数的衰减关系进行对比分析发现，t1与震级之间有明显的相关性，实际应用中应考虑震级对t1的影响；地震整体持时较短造成ts上升趋势随距离的增加而变缓；下降段由衰减系数c的变化可见，记录整体衰减较快。
This paper selects 105 sets of vertical strong motion observation for 27 earthquakes that occurred in Northeast China and adjacent areas between 2008 and 2019 and uses the observations to derive parameters of the vertical ground motion intensity envelope functions by best-fitting a three-segment intensity envelope function model using a weighted least-square regression method and establish their attenuation relationships in the study area. By doing this, the division of seismic regions in China becomes more universal. Similar to previous studies, the duration of the rising period t1 and stable period ts is determined by a 70% significant duration method. The magnitude of the selected earthquakes ranges from 3.3 to 5.8, and the maximum epicentral distance is 371 km. By comparing vertical recordings on soil sites with the attenuation relationship of time history intensity envelope function derived by HUO Junrong in 1989, which is widely used in the Chinese Mainland, it shows that t1 is obviously correlated to magnitude therefore the influence of magnitude on t1 should be considered in practical applications. The increasing trend of the parameter ts weakens as the epicentral distances increase due to the short duration of earthquakes, and the decline coefficient c is larger than that of HUO (1989) in general.
2020,41(4): 11-17 收稿日期：2019-08-26
DOI：10.3969/j.issn.1003-3246.2020.04.002
基金项目：黑龙江省地震局一般科研项目（项目编号：201902）
作者简介：张美玲(1987-),女,博士在读,主要从事地震监测、地震应急和信息网络相关工作。E-mail:366579193@qq.com
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