摘要
采用Nakai拟合模型,对怀来体应变固体潮整点值观测资料进行拟合检验,并求取体应变固体潮的振幅因子A、时间滞后Δt以及拟合多项式各阶的系数a0,a1,a2等特征参量。研究发现,振幅因子A和拟合常数项a0能够良好地反映介质的弹性性质,体现了与地震有关的前兆特征,并在张北地震前出现前兆变化;而其他参数的变化主要反映了季节性年周期环境变化对观测资料的影响。
The solid earth tide of volume strain amplitude factor A and time lag At and polynomial coefficient（α0 ,α1 ,α2） have been obtained by using Nakai＇s fitting model to the hour observation data of volume strain in Huailai station. The results indicated that amplitude factor A and fitting coefficient α0 can well reflect medium elasticity characteristic and earthquake anomaly. They had changed before Zhangbei earthquake. Other factors are mainly reflected the season variation of environment.
出处
《地震地磁观测与研究》
2005年第B10期163-167,共5页
Seismological and Geomagnetic Observation and Research
关键词
体应变
固体潮
Nakai拟合
前兆特征
volume strain, solid earth tide, Nakai fitting, anomalous characteristic
