摘要
本文根据地质构造、地貌形态及地震活动性特点等将中国西北黄土地区分为4令分区,研究了该地区的地震动衰减规律。研究结果表明,从西向东烈度、地震动衰减速度减慢,即土层厚度越大衰减越慢。对于地震等震线的不确定性问题。本文采用插值法进行了预处理,使烈度统计结果更能反映真实情况,并降低了危险性水平。另外,还尝试引入了介质品质因子Q值来调整加速度、速度衰减规律中的粘滞系数,对其他参数也作了相应的调整。
In this paper, according to the geological structure, geomorphic feacture and the characteristics of seismic activity, the author: divided the loess region of the Northwest China into four subregions and studied their attenuation laws of seismic ground motion. The results show that the attenuation rate of intensity as well as seismic ground motion becomes slower from the western region to the eastern region with the increasing of the thickness of soil stratum. Before statistical analysis, the authors made linear interpolation of isoseismic contours to consider the uncertainty of attenuation. The authors also put forward a new thought, that is, using the Q value to adjust the parameters of attenuation law of seismic ground motion.
出处
《西北地震学报》
CSCD
1989年第4期25-36,共12页
Northwestern Seismological Journal
